JP7820728B2 - Method for predicting solidification cracking susceptibility of alloy, device for predicting solidification cracking susceptibility of alloy, and program for predicting solidification cracking susceptibility of alloy - Google Patents

Description

The present invention relates to a method for predicting the solidification cracking susceptibility of an alloy, an apparatus for predicting the solidification cracking susceptibility of an alloy, and a program for predicting the solidification cracking susceptibility of an alloy during casting.

When various metals are cast, cracks (so-called solidification cracks) may occur in the ingot due to solidification shrinkage or thermal shrinkage of the ingot after solidification is complete. Because the occurrence of solidification cracks varies greatly depending on the type of metal that constitutes the ingot, it is necessary to evaluate the susceptibility of various metals to solidification cracks (solidification crack susceptibility).
In particular, since the solidification cracking susceptibility of alloys varies depending on the type and content of added elements, it is necessary to predict the solidification cracking susceptibility when developing alloys.

In order to develop alloys taking solidification cracking susceptibility into consideration, simple casting tests have been widely conducted using evaluation molds such as those described in Non-Patent Document 1, in which the type and content of added elements are varied. However, these tests are costly in terms of work time and raw material costs, and therefore a simpler and more rapid method for predicting solidification cracking susceptibility is desired.
Here, Patent Document 1 proposes a method for easily and quickly predicting solidification cracking of Al alloys, in which the type and amount of added elements, the casting speed, and the cross-sectional area of the cast product are input to evaluate the susceptibility to casting cracking.

The prediction of solidification cracking in Patent Document 1 is a method that focuses on two points: the width of the temperature range in which alloy cracking is likely to occur (hereinafter referred to as the solidification cracking danger zone), and the amount of solidification shrinkage at a specific solid fraction related to the range. Note that the concept used in Patent Document 1 as the threshold value of the solidification cracking danger zone is generally known.
In other words, above the solid fraction where solid phases begin to bond together, volume shrinkage occurs as the temperature drops, and even if the solid phases separate due to tensile deformation, the remaining liquid phase cannot fill the gaps, making cracks more likely to occur.On the other hand, as solidification progresses further and the bonds between the solid phases become stronger, and the overall strength becomes nearly equal to that of a completely solidified state, resistance to tensile deformation becomes high and cracks are less likely to occur.
When the threshold value is expressed as a solid fraction, it varies depending on the alloy system, but the lower limit solid fraction is usually about 0.6 to 0.8, and the upper limit solid fraction is usually about 0.95 to 0.98.

Patent No. 5302737

Yutani et al., Light Metals Vol. 33 (1983), pp. 705-711 A. M. Nabawy, A. M. Samuel, F. H. Samuel and H. W. Doty: J. Mater. Sci., 47 (2012), 4146-4158. K. Ganjehfard, R. Taghiabadi, M. T. Noghami and M. H. Ghoncheh: International Journal of Minerals, Metallurgy and Materials, 28 (2021), 718-728. G. Razaz and T. Carlberg: Metal. Mater. Trans. A, 50 (2019), 3842-3854.

However, Patent Document 1 had problems such as being unable to properly predict solidification cracking susceptibility depending on the alloy system.

The present invention was made against the backdrop of the above circumstances, and aims to clarify the causes of the above problems and provide a method for predicting the solidification cracking susceptibility of alloys, an apparatus for predicting the solidification cracking susceptibility of alloys, and a program for predicting the solidification cracking susceptibility of alloys that can easily and quickly predict the relative change in solidification cracking susceptibility when the amount of added elements is changed in any alloy system.

In order to solve the above-mentioned problems, the present inventors have conducted extensive research and have come to the following findings.
The compounds that crystallize during solidification act as auxiliary bonds between particles of the α phase (parent phase), resulting in many areas where the solid phases are bonded together even if the solid fraction is the same, improving strength during solidification and suppressing the occurrence of cracks.
In other words, in an alloy system in which compounds are produced, the solid fraction range corresponding to the solidification cracking danger zone is narrower than in an alloy system in which no compounds are produced, and even when comparing any alloy system in which compounds are produced, the solid fraction range corresponding to the solidification cracking danger zone can vary depending on the amount of compounds that crystallize.
Therefore, it became clear that the method of using only the solid fraction and the amount of solidification shrinkage as in Patent Document 1 cannot predict appropriate solidification cracking susceptibility.

Furthermore, by utilizing this knowledge, it is possible to calculate and compare the amount of compounds that crystallize during solidification, making it possible to easily and quickly predict the relative change in solidification cracking susceptibility when the amount of added elements is changed in any alloy system.
Furthermore, by limiting the range of the amount of the compounds to be counted during the comparative evaluation to the range from the start of solidification to the lower limit of the solidification cracking danger zone in the basic composition of the target alloy, rather than the entire zone during solidification, it is possible to evaluate the fluctuations on the lower limit side of the solidification cracking danger zone and accurately predict the solidification cracking susceptibility.
Furthermore, by setting the lower limit of the above-mentioned calculation range to a solid fraction of about 0.4 to 0.6 rather than at the start of solidification, it is possible to exclude the influence of the amount of compounds that are thought to be unlikely to contribute to the connection between α-phase particles because they crystallize in the early stages of solidification and are incorporated into the α-phase, etc. This makes it possible to predict solidification cracking susceptibility with even greater accuracy.

Furthermore, by limiting the range of the calculation to the range between the lower limit solid fraction and the upper limit solid fraction of the solidification cracking danger zone in the basic composition of the target alloy, it is possible to evaluate the fluctuation in the width of the solidification cracking danger zone and accurately predict the solidification cracking susceptibility.
The evaluations using the multiple aggregation ranges described above can be performed simultaneously and instantaneously once the crystallization timing and compound amount of the compound that crystallizes during solidification are known. Therefore, by combining the evaluation results for the multiple aggregation ranges, solidification cracking susceptibility can be predicted easily, quickly, and with greater accuracy. If differences in the solidification cracking susceptibility prediction results are found depending on the aggregation range, the cost of the overall solidification cracking susceptibility prediction can be significantly reduced by limitedly utilizing an evaluation method such as that described in Non-Patent Document 1 compared to using only the evaluation method described in Non-Patent Document 1.

The present invention has been made based on the above-mentioned findings, and the method for predicting solidification cracking susceptibility of an alloy of the present invention is a method for predicting solidification cracking susceptibility of an alloy when it is cast, and is characterized by comprising: an input step for inputting the types and amounts of additional elements contained in the alloy; a compound information acquisition step for acquiring the crystallization timing and compound amount of each of the various compounds that crystallize during solidification based on the input types and amounts of the additional elements; a compound amount aggregation step for aggregating the crystallization amounts of the various compounds that crystallize during solidification based on the compound information; and a solidification cracking susceptibility evaluation step for evaluating the solidification cracking susceptibility of the alloy based on the aggregated crystallization amounts of the various compounds .

The solidification cracking susceptibility prediction device for an alloy of the present invention is an alloy solidification cracking susceptibility prediction device that predicts the solidification cracking susceptibility of an alloy when it is cast, and is characterized by comprising: an input means for inputting the types and contents of added elements contained in the alloy; a compound information acquisition means for acquiring the crystallization timing and compound amount of each of the various compounds that crystallize during solidification based on the input types and contents of the added elements; a compound amount aggregation means for aggregating the crystallization amounts of the various compounds that crystallize during solidification based on the compound information; and a solidification cracking susceptibility evaluation means for evaluating the solidification cracking susceptibility of the alloy based on the aggregated crystallization amounts of the various compounds .

The solidification cracking susceptibility prediction program for an alloy of the present invention is a program for predicting the solidification cracking susceptibility of an alloy when it is cast, and is characterized by having a computer realize the following: an input function for setting the type and content of added elements contained in the alloy; a compound information acquisition function for acquiring the crystallization timing and compound amount of each of the various compounds that crystallize during solidification based on the input type and content of the added elements; a compound amount aggregation function for aggregating the crystallization amounts of the various compounds that crystallize during solidification based on the compound information; and a solidification cracking susceptibility evaluation function for evaluating the solidification cracking susceptibility of the alloy based on the aggregated crystallization amounts of the various compounds .

The solidification cracking susceptibility prediction method, apparatus, and program for predicting solidification cracking susceptibility of an alloy of the present invention are configured to obtain the crystallization timing and amount of compounds that crystallize during solidification from the type and content of added elements contained in the alloy, calculate the amount of the compounds that crystallize during solidification, and predict the solidification cracking susceptibility of the alloy based on the calculated amount of compounds.This makes it possible to evaluate the effect of improving strength due to increased bonding between solid phases caused by the crystallized compounds, and to accurately predict solidification cracking susceptibility.

Here, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of the present invention, the range of aggregation of the amount of the compound may be from the start of solidification to a lower limit solid fraction of a solidification cracking danger zone that is set according to the composition of the alloy.
Furthermore, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of the present invention, the aggregation range of the compound amounts may be from a solid fraction arbitrarily set in the range of 0.4 to 0.6 to a lower limit solid fraction of a solidification cracking danger zone set in accordance with the composition of the alloy.
Furthermore, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of the present invention, the range of the amount of the compound to be calculated may be from a lower limit solid fraction to an upper limit solid fraction of a solidification cracking danger zone that is set according to the composition of the alloy.

Furthermore, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of the present invention, it is preferable that the alloy is a hypoeutectic alloy or a peritectic alloy.

Furthermore, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of the present invention, it is preferable that the alloy is an aluminum alloy or a copper alloy.

The present invention makes it possible to provide a method for predicting the solidification cracking susceptibility of an alloy, an apparatus for predicting the solidification cracking susceptibility of an alloy, and a program for predicting the solidification cracking susceptibility of an alloy, which can predict the solidification cracking susceptibility of an alloy simply, quickly, and accurately.

FIG. 1 is a flow chart of a method for predicting solidification cracking susceptibility of an alloy according to one embodiment of the present invention. 1 is a block diagram showing an alloy solidification cracking susceptibility prediction device and an alloy solidification cracking susceptibility prediction program according to one embodiment of the present invention. [0022] FIG. 1 is a graph showing the relationship between the solid phase ratio of an Al—Mn—Cu alloy and the amounts of parent phase and compound phase produced, and a graph showing the relationship between the solid phase ratio and temperature. This is an image of the structure in the area at risk of solidification cracking. 1 is a graph showing the relationship between the solid fraction and the amount of the matrix phase and the compound phase produced for Alloy No. 1 in Table 1, and a graph showing the relationship between the solid fraction and the temperature. 1 is a graph showing the relationship between the solid fraction and the amount of the matrix phase and the compound phase produced for Alloy No. 2 in Table 1, and a graph showing the relationship between the solid fraction and the temperature. 1 is a graph showing the relationship between the solid fraction and the amount of the matrix phase and the compound phase produced, and a graph showing the relationship between the solid fraction and the temperature, for Alloy No. 3 in Table 1. 1 is a graph showing the relationship between the solid fraction and the amount of the matrix phase and the compound phase produced, and a graph showing the relationship between the solid fraction and the temperature, for Alloy No. 4 in Table 1. 1 is a graph showing the relationship between the solid fraction and the amount of the matrix phase and the compound phase produced, and a graph showing the relationship between the solid fraction and the temperature, for Alloy No. 5 in Table 1. 1 is a graph showing the results of tabulating the amounts of compounds for alloy numbers 1 to 5 shown in Table 1 when the solid phase fraction is set to a range of 0 to 0.75. 1 is a graph showing the results of compound amount calculations for alloy numbers 1 to 5 shown in Table 1 when the solid fraction range is set to 0.5 to 0.75. 1 is a graph showing the results of tabulating the amounts of compounds for alloy numbers 1 to 5 shown in Table 1 when the solid fraction range is set to 0.75 to 0.98. 1 is a graph showing the results of solidification cracking susceptibility experiments in the non-patent document and the results when the present invention is applied to the alloy composition in the non-patent document.

Below, an embodiment of the present invention, a method for predicting solidification cracking susceptibility of an alloy, an apparatus for predicting solidification cracking susceptibility of an alloy, and a program for predicting solidification cracking susceptibility of an alloy, will be described with reference to the attached figures.

The present embodiment of the alloy solidification cracking susceptibility prediction method, alloy solidification cracking susceptibility prediction device, and alloy solidification cracking susceptibility prediction program is used to predict the likelihood of solidification cracking occurring during alloy casting (so-called solidification cracking susceptibility).

Here, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy, which are the present embodiments, it is preferable that the target alloy is a hypoeutectic alloy or a peritectic alloy in which the α phase, which becomes the parent phase during solidification, crystallizes as the primary crystal.
In addition, in the method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy according to the present embodiment, the target alloy is preferably an aluminum alloy or a copper alloy.
Therefore, in this embodiment, an Al-Mn-Cu alloy will be described as an example.

As shown in FIG. 1 , the method for predicting solidification cracking susceptibility of an alloy according to this embodiment includes an input step S01, a compound information acquisition step S02, a compound amount aggregation step S03, and a solidification cracking susceptibility evaluation step S04.
The solidification cracking susceptibility prediction device 10 of this embodiment implements the solidification cracking susceptibility prediction method of this embodiment, and as shown in FIG. 2, includes an input means 11, a compound information acquisition means 12, a compound amount aggregation means 13, a solidification cracking susceptibility evaluation means 14, and an output means 15 that outputs the evaluation results.
Furthermore, the solidification cracking susceptibility prediction program of this embodiment causes a computer to realize the above-mentioned input means 11 (input function), compound information acquisition means 12 (compound information acquisition function), compound amount totalizing means 13 (compound amount totalizing function), solidification cracking susceptibility evaluation means 14 (solidification cracking susceptibility evaluation function), and output means 15 (output function).

In the input step S01 (input means 11, input function), the type and content of the additive elements contained in the alloy are input.
In this embodiment, the contents of Mn, Cu, Si, and Fe, which are additive elements in an Al-Mn-Cu alloy, are input. In this embodiment, the contents of Mn, Cu, and Si are set to 1.15 mass%, 1.00 mass%, and 0.50 mass%, respectively, and the content of Fe is varied to two levels: 0.15 mass% and 0.4 mass%.

In the compound information acquisition step S02 (compound information acquisition means 12, compound information acquisition function), the crystallization timing and compound amount of compounds that crystallize during solidification are acquired based on the input type and content of added elements. The compound information can be acquired using commercially available thermodynamic calculation software such as JMatPro (manufactured by USE Software Asia Co., Ltd.).

In this embodiment, as shown in Figure 3, the relationship between the solid fraction that increases during solidification and the amount of crystallized compounds was obtained. In Figure 3, the horizontal axis represents the solid fraction, the vertical axis (left side) represents the proportion of crystallized compounds, and the vertical axis (right side) represents the proportion of α phase (primary crystals). The dotted line represents the case where the Fe content is 0.15 mass% (hereinafter referred to as the 0.15Fe condition), and the solid line represents the case where the Fe content is 0.4 mass% (hereinafter referred to as the 0.4Fe condition). It can be seen that with a higher Fe content, compounds crystallize at a lower solid fraction and the amount of crystallized compounds is also greater. Furthermore, from the graph of temperature and solid fraction, it can be seen that the overall solid fraction is hardly affected by the amount of crystallized compounds.

In the compound amount counting step S03 (compound amount counting means 13, compound amount counting function), the amounts of compounds crystallizing during solidification are counted based on the compound information acquired in the compound information acquisition step S02 (compound information acquisition means 12, compound information acquisition function).
Here, upper and lower limit solid fractions are set for the solidification cracking danger zone to limit the range of the amount of the compound. The lower limit solid fraction of the solidification cracking danger zone, where α phases (parent phases) begin to bond together and solidification cracking becomes more likely to occur, varies depending on the alloy composition, but the lower limit solid fraction of the solidification cracking danger zone is usually set within a solid fraction range of 0.6 to 0.8. In Figure 3, the lower limit solid fraction of the solidification cracking danger zone is set to 0.75. The upper limit solid fraction is set to 0.98.
In this embodiment, the crystallization amounts (compound amounts) of various compounds that crystallize during solidification are tallied from the compound information shown in Fig. 3. As an example, when the tabulation range is set from the lower limit solid fraction (0.75) to the upper limit solid fraction (0.98) of the solidification cracking danger zone, the results, expressed in volume ratio, are approximately 0.99 vol% under the 0.4Fe condition and approximately 0.84 vol% under the 0.15Fe condition.

In the solidification cracking susceptibility evaluation step S04 (solidification cracking susceptibility evaluation means 14, solidification cracking susceptibility evaluation function), the solidification cracking susceptibility of the alloy is evaluated based on the collected amounts of crystallization of various compounds.
As shown in Figure 4, during the solidification process, the parent phase (α phase) crystallizes and grows as primary crystals, and a residual liquid phase exists between the α phase particles. When compounds crystallize here, they fill the spaces between the α phase particles, bonding the α phase particles together in the solid phase. In other words, there are many areas where the solid phases are bonded together, improving strength. This suppresses the occurrence of cracks during the solidification process.
Therefore, by comparing the amounts of crystallization (amounts of compounds) of various compounds that crystallize during solidification, which are tallied in the compound amount totalizing step S03 (compound amount totalizing means 13, compound amount totalizing function), it is possible to evaluate the effect of improving strength due to solid phase bonding and to predict the solidification cracking susceptibility of the alloy.

When the tabulation results are compared between the 0.4Fe condition and the 0.15Fe condition, the amount of the compound is greater under the 0.4Fe condition, regardless of the selection of the tabulation range, and therefore it is predicted that the 0.4Fe condition will have lower solidification cracking susceptibility.
When developing an alloy, the type and content range of the added elements are selected according to the required properties, and the method for predicting the solidification cracking susceptibility of an alloy of this embodiment is carried out within that range, thereby identifying an alloy composition with low solidification cracking susceptibility.

As described above, according to the method for predicting solidification cracking susceptibility of an alloy, the apparatus 10 for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy of this embodiment, the crystallization timing and amount of compounds that crystallize during solidification are obtained from the types and contents of the added elements contained in the alloy, the amounts of the compounds that crystallize during solidification are tallied, and the solidification cracking susceptibility of the alloy is predicted based on the tallied amounts of the compounds.Therefore, it is possible to evaluate the effect of improving strength due to increased bonding between solid phases caused by the crystallized compounds, and it is possible to easily, quickly, and accurately predict the relative change in solidification cracking susceptibility when the amount of added elements is changed in any alloy system.
When the target alloy is a hypoeutectic alloy or a peritectic alloy, and further when the alloy is an aluminum alloy or a copper alloy, it becomes possible to predict the solidification cracking susceptibility of the alloy with even greater accuracy.

The method for predicting solidification cracking susceptibility of an alloy, the device for predicting solidification cracking susceptibility of an alloy, and the program for predicting solidification cracking susceptibility of an alloy according to the present embodiment have been described above. However, the present invention is not limited to this, and can be modified as appropriate within the scope of the technical concept of the invention.
For example, in the present embodiment, an Al--Mn--Cu alloy is used as an example, but other alloys may also be used.
Furthermore, although JMatPro (manufactured by USE Software Asia Co., Ltd.) has been used as an example of thermodynamic calculation software, other thermodynamic calculation software may also be used.
Furthermore, the compound information may be obtained by means other than thermodynamic calculation, such as by utilizing a database or machine learning.

Furthermore, the lower limit solid fraction and upper limit solid fraction of the solidification cracking danger zone used as thresholds for the range of compound amounts may be outside the ranges of 0.6 to 0.8 and 0.95 to 0.98, respectively.
Furthermore, if the compound causing the fracture within the fracture surface, i.e., the compound that contributes to strengthening the bond between α-phase particles, can be identified by separately conducting observations of the solidification cracking surface of the target alloy system, an even more accurate prediction can be made by limiting the evaluation to the crystallization amount of that compound.

The following describes the results of confirmation experiments and verifications conducted to confirm the effects of the present invention.
As shown in Alloy Nos. 1 to 5 in Tables 1 and 2, the Fe content of Al-Mn-Cu alloys was varied to five levels between 0.0 and 0.4 mass%, and solidification cracking susceptibility was evaluated.
Alloy Nos. 6 to 19 in Tables 1 and 2 are alloys whose solidification cracking susceptibility was evaluated in Non-Patent Documents 2, 3, and 4. In this example, the present invention was applied to the alloy compositions in the Non-Patent Documents, and a comparison was made with the solidification cracking susceptibility evaluation results in the Non-Patent Documents. Note that in all of the Non-Patent Documents, casting experiments were performed using an evaluation mold known as a CRC (Constrained Rod Casting) mold, and HTS (Hot Tearing Susceptibility) was used as the solidification cracking susceptibility index.

The composition (added elements, content) of each alloy was input, and the timing of crystallization and the amount of compounds that crystallized during solidification were calculated by thermodynamic calculation. The calculation results for alloy numbers 1 to 5 are shown in Figures 5 to 9, respectively, and the compound amount calculation results for the three types of calculation ranges are shown in Table 2 and Figures 10 to 12.
In addition, an I-beam test as shown in Non-Patent Document 1 was carried out six times for each of the 0.4Fe and 0.15Fe conditions, and the solidification cracking susceptibility was experimentally evaluated using the ratio of the crack length at the crack initiation position to the total circumference of the test piece at that position as an index. The results are shown in Table 3.

For alloy numbers 1 to 5, a tendency for the amount of compounds to increase as the Fe content increases was confirmed in all calculation ranges, and it is predicted that the higher the Fe content, the lower the solidification cracking susceptibility. Furthermore, the results of actual casting experiments, as shown in Table 3, confirmed that increasing the Fe content reduces solidification cracking susceptibility.

Furthermore, for alloy numbers 6 to 19, solidification cracking susceptibility evaluations using a similar CRC mold were performed in Non-Patent Documents 2, 3, and 4, and therefore the values of the cracking evaluation index HTS were read from the drawings in the aforementioned Non-Patent Documents and listed together with the calculated amounts of compounds in Table 2. HTS is an index that indicates that the higher the value, the higher the solidification cracking susceptibility, so by taking the reciprocal of the amount of compounds calculated according to the present invention, a cross-verification was performed with the solidification cracking susceptibility evaluation results according to the present invention.
As a result, as shown in FIG. 13, it was confirmed that the trend of the reciprocal of the amount of compound when the solid fraction was set to a range of 0.75 to 0.98 was in good agreement with the trend of the solidification cracking susceptibility evaluation results according to the non-patent document.

As a result of the above confirmation experiments and verification, it has been confirmed that the present invention can provide a method for predicting the solidification cracking susceptibility of an alloy, an apparatus for predicting the solidification cracking susceptibility of an alloy, and a program for predicting the solidification cracking susceptibility of an alloy, which can be easily, quickly, and accurately predicted.

Claims (18)

A method for predicting solidification cracking susceptibility of an alloy during casting, comprising:
an input step of inputting the type and content of the additive element contained in the alloy;
a compound information acquisition step of acquiring crystallization timing and compound amount of each of various compounds that crystallize during solidification based on the input type and content of the additive element;
a compound amount counting step of counting the amounts of crystallized compounds of various compounds that crystallize during solidification based on the compound information;
a solidification cracking susceptibility evaluation step of evaluating the solidification cracking susceptibility of the alloy based on the collected amounts of crystallization of various compounds ;
A method for predicting solidification cracking susceptibility of an alloy, comprising: The method for predicting solidification cracking susceptibility of an alloy described in claim 1, characterized in that the range of compound amounts is from the start of solidification to the lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The method for predicting solidification cracking susceptibility of an alloy described in claim 1, characterized in that the range of the compound amount calculation ranges from an arbitrarily determined solid fraction in the range of 0.4 to 0.6 to the lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The method for predicting solidification cracking susceptibility of an alloy described in claim 1, characterized in that the range of the compound amount calculation is from the lower limit solid fraction to the upper limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. A method for predicting the solidification cracking susceptibility of an alloy according to any one of claims 1 to 4, characterized in that the alloy is a hypoeutectic alloy or a peritectic alloy. A method for predicting solidification cracking susceptibility of an alloy according to any one of claims 1 to 5, characterized in that the alloy is an aluminum alloy or a copper alloy. An alloy solidification cracking susceptibility prediction device for predicting solidification cracking susceptibility during casting of an alloy, comprising:
an input means for inputting the type and content of the additive element contained in the alloy;
a compound information acquisition means for acquiring the crystallization timing and compound amount of each of various compounds that crystallize during solidification based on the input type and content of the additive element;
a compound amount counting means for counting the amounts of crystallized compounds that crystallize during solidification based on the compound information;
a solidification cracking susceptibility evaluation means for evaluating the solidification cracking susceptibility of the alloy based on the collected amounts of crystallization of various compounds ;
An alloy solidification cracking susceptibility prediction device comprising: The solidification cracking susceptibility prediction device for alloys described in claim 7, characterized in that the range of compound amounts collected is from the start of solidification to the lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction device for alloys described in claim 7, characterized in that the aggregate range of the compound amount ranges from an arbitrarily determined solid fraction in the range of 0.4 to 0.6 to a lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction device for alloys described in claim 7, characterized in that the range of compound amounts collected is from the lower limit solid fraction to the upper limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction device for an alloy according to any one of claims 7 to 10, characterized in that the alloy is a hypoeutectic alloy or a peritectic alloy. The solidification cracking susceptibility prediction device for an alloy according to any one of claims 7 to 11, characterized in that the alloy is an aluminum alloy or a copper alloy. A program for predicting solidification cracking susceptibility of an alloy, which predicts the solidification cracking susceptibility of the alloy when it is cast, comprising:
an input function for setting the type and content of the additive elements contained in the alloy;
a compound information acquisition function that acquires the crystallization timing and compound amount of each of various compounds that crystallize during solidification based on the input type and content of the added element;
a compound amount calculation function that calculates the amount of crystallization of various compounds that crystallize during solidification based on the compound information;
a solidification cracking susceptibility evaluation function for evaluating the solidification cracking susceptibility of the alloy based on the aggregated crystallization amounts of various compounds ;
A program for predicting the solidification cracking susceptibility of alloys, which is characterized by implementing the above on a computer. The solidification cracking susceptibility prediction program for alloys described in claim 13, characterized in that the range of compound amounts collected is from the start of solidification to the lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction program for alloys described in claim 13, characterized in that the range of compound amounts is from an arbitrarily determined solid fraction in the range of 0.4 to 0.6 to the lower limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction program for alloys described in claim 13, characterized in that the range of compound amounts is from the lower limit solid fraction to the upper limit solid fraction of the solidification cracking danger zone set according to the composition of the alloy. The solidification cracking susceptibility prediction program for an alloy according to any one of claims 13 to 16, characterized in that the alloy is a hypoeutectic alloy or a peritectic alloy. The solidification cracking susceptibility prediction program for an alloy according to any one of claims 13 to 17, characterized in that the alloy is an aluminum alloy or a copper alloy.