JPH0257138B2 - - Google Patents
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- Publication number
- JPH0257138B2 JPH0257138B2 JP60178289A JP17828985A JPH0257138B2 JP H0257138 B2 JPH0257138 B2 JP H0257138B2 JP 60178289 A JP60178289 A JP 60178289A JP 17828985 A JP17828985 A JP 17828985A JP H0257138 B2 JPH0257138 B2 JP H0257138B2
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- Prior art keywords
- corrosion resistance
- precipitated
- dispersed
- alloy
- hardness
- Prior art date
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Description
〔産業上の利用分野〕
この発明は、特に高強度および高硬度を有し、
かつ耐食性にもすぐれたNi−Cr−Mo系鋳造合金
に関するものである。
〔従来の技術〕
一般に、化学プラント、電気めつき装置、およ
び半導体装置などの構造用鋳物部材、食品加工お
よび医療用器具、さらに海水などにさらされる各
種刃物や手工具等の鋳物部材の製造には、すぐれ
た耐食性が要求されることから、各種の耐食性
Ni基鋳造合金が用いられている。
〔発明が解決しようとする問題点〕
しかし、近年、上記の耐食性Ni基鋳造合金が
適用されている産業分野においても軽量化および
薄肉化が要求されるようになつてきたが、上記の
各種耐食性Ni基鋳造合金は、すぐれた耐食性を
もつものの、強度および硬さが不十分なために、
これらの要求を満足することができないのが現状
である。
〔問題点を解決するための手段〕
そこで、本発明者等は、上述のような観点か
ら、すぐれた耐食性を具備した上で、さらに高強
度と高硬度を有する鋳造合金を開発すべく研究を
行なつた結果、重量％で（以下％は重量％を示
す）、
Cr：23％超〜42％、
Mo：17％超〜28％、
（ただしCr＋Mo：45％超〜55％）、
を含有し、さらに必要に応じて、
(a) Fe：１〜10％、
(b) Ｗ、Cu、およびＶのうちの１種または２種
以上：0.1〜５％、
(c) Co：0.1〜５％、
以上(a)〜(c)のうちの１種または２種以上を含有
し、残りがNiと不可避不純物からなる組成を有
するNi−Cr−Mo系鋳造合金は、すぐれた耐食性
を有し、かつ熱処理により位相的最密構造を有す
る金属間化合物が素地中に微細に分散析出した組
織をもつようになるが、この状態で高強度と高硬
度を示すようになるという研究結果を得たのであ
る。
なお、この発明のNi−Cr−Mo系鋳造合金にお
ける金属間化合物は、上記の通り位相的最密構造
を有するが、「位相的最密構造」とは、昭和55年
７月15日発行の長崎誠三編、「金属用語集」、第
121頁によれば、「Laves相やσ相のように原子団
を構成単位の一つとして最密構造を組んでる結晶
構造」をいい、具体的にはNi−Cr−Mo系３元状
態図のσ相およびｐ相に相当する組成の金属間化
合物がこれに該当するものである。
また、上記の位相的最密構造を有する金属間化
合物は、この発明の上記成分組成を有するNi−
Cr−Mo系鋳造合金においては、1150〜1250℃の
温度で均質化処理を行なつた後、850〜1100℃の
温度に加熱保持することにより素地中に微細均一
に分散析出させることができる。
したがつて、この発明は、上記研究結果にもと
づいてなされたものであつて、
Cr：23％超〜42％、
Mo：17％超〜28％、
（ただしCr＋Mo：45％超〜55％）、
を含有し、さらに必要に応じて、
(a) Fe：１〜10％、
(b) Ｗ、Cu、およびＶのうちの１種または２種
以上：0.1〜５％、
(c) Co：0.1〜５％、
以上(a)〜(c)のうち１種または２種以上を含有
し、残りがNiと不可避不純物からなる組成を有
し、かつ素地中に位相的最密構造を有する金属間
化合物が分散析出した組織を有する、高強度、高
硬度、および高耐食性をもつたNi−Cr−Mo系鋳
造合金に特徴を有するものである。
つぎに、この発明の鋳造合金の成分組成を上記
の通りに限定した理由を説明する。
(a) CrおよびMo
CrおよびMo成分には、いずれも素地に固溶
して、これの耐食性を向上させるほか、素地に
微細に分散する位相的最密構造の金属間化合物
（以下TCP相という）を形成して、合金の強度
と硬さを著しく向上させる作用があるが、その
含有量が、CrおよびMoのいずれかでも、Cr：
23％以下、Mo：17％以下の場合には前記作用
が安定して得られないので、Cr：23％超にし
て、Mo：17％超の含有が必要であり、しかし
この場合CrとMoの合量：（Cr＋Mo）が45％以
下の場合には、塑性加工が可能なので必ずしも
鋳造による鋳物部材の製造には必要でなく、し
たがつて、必然的に鋳造による鋳物部材の製造
を必要とする（Cr＋Mo）の下限値は45％超と
なるものであり、一方、CrおよびMoのいずれ
かでも、Crの場合：42％、Moの場合：28％を
越えても、またこれら両者の含量が55％を越え
ても溶湯の流動性が劣化し、特に小物や複雑形
状鋳物の製造が困難になることから、その含有
量を、Cr：23％超〜42％、Mo：17％超〜28％
にして、Cr＋Mo：45％超〜55％と定めた。
(b) Fe
Fe成分には、Niの一部を代替しても合金特
性を何ら損なわない作用があるので、経済性を
考慮してNi含有量の一部をFeで置換する場合
があるが、その含有量が１％未満では所望の経
済効果が得られず、一方10％を越えて含有させ
る耐食性が劣化するようになつていることか
ら、その含有量を１〜10％と定めた。
(c) Ｗ、CuおよびＶ
これらの成分には、合金の耐食性を一段と向
上せしめる作用があるので、特により一層の耐
食性が要求される場合に必要に応じて含有され
るが、その含有量が0.1％未満では所望の耐食
性向上効果が得られず、一方その含有量が５％
を越えると、鋳造欠陥が発生するようになるこ
とから、その含有量を0.1〜５％と定めた。
(d) Co
Co成分には、機械的性質、特に硬さを増し
て、耐摩耗性を向上させる作用があるので、こ
れらの特性が要求される場合に必要に応じて含
有されるが、その含有量が0.1％未満では所望
の硬さ向上効果が得られず、一方その含有量が
５％を越えてもより一層の向上効果は得られな
いことから、経済性を考慮して、その含有量を
0.1〜５％と定めた。
(e) 不可避不純物
合金溶製時に脱酸剤や脱硫剤を使用するので
不可避不純物としてMn、Mg、Ｃ、およびSi
などの含有は避けられないが、これらの含有量
が、それぞれMn：0.1％以下、Mg：0.05％以
下、Ｃ：0.2％以下、およびSi：0.8％以下であ
れば、合金特性が何らそこなわれるものではな
い。
〔実施例〕
つぎに、この発明のNi−Cr−Mo系鋳造合金を
実施例により具体的に説明する。
通常の高周波炉を用い、Ar雰囲気中で、それ
ぞれ第１表に示される成分組成をもつた溶湯を調
製し、直径：60mm〓×長さ：200mmの寸法をもつた
鋳物に鋳造し、この鋳物に、1150〜1250℃の範囲
内の所定温度に10時間保持の条件で均質化処理を
施した後、850〜1100℃の範囲内で所定温度に３
時間保持の条件で熱処理を施して、素地中に微細
均一にTCP相を分散析出させることにより本発
明鋳造合金１〜26の鋳物を製造した。
また、比較の目的で、成分組成を第１表に示さ
れる組成とし、かつ熱処理を500〜800℃の範囲内
の所定温度に３時間保持の条件で行なう以外は同
一の条件で、従来耐食性のすぐれたNi基鋳造
[Industrial Application Field] This invention has particularly high strength and high hardness,
The present invention relates to a Ni-Cr-Mo cast alloy that also has excellent corrosion resistance. [Prior art] Generally, it is used in the production of structural casting parts such as chemical plants, electroplating equipment, and semiconductor devices, food processing and medical instruments, and various types of cutlery and hand tools that are exposed to seawater. Since excellent corrosion resistance is required, various types of corrosion resistance
A Ni-based casting alloy is used. [Problems to be solved by the invention] However, in recent years, there has been a demand for weight reduction and thinning even in the industrial fields where the above-mentioned corrosion-resistant Ni-based casting alloys are applied. Although Ni-based casting alloys have excellent corrosion resistance, their strength and hardness are insufficient.
At present, these demands cannot be met. [Means for Solving the Problems] Therefore, from the above-mentioned viewpoint, the present inventors conducted research to develop a cast alloy that has excellent corrosion resistance, as well as high strength and hardness. As a result, in weight% (hereinafter % indicates weight%), it contained Cr: more than 23% to 42%, Mo: more than 17% to 28%, (however, Cr + Mo: more than 45% to 55%). and, if necessary, (a) Fe: 1 to 10%, (b) one or more of W, Cu, and V: 0.1 to 5%, (c) Co: 0.1 to 5%. %, Ni-Cr-Mo cast alloys containing one or more of the above (a) to (c), with the remainder consisting of Ni and unavoidable impurities, have excellent corrosion resistance. , and the heat treatment results in a structure in which intermetallic compounds with a topologically close-packed structure are finely dispersed and precipitated in the matrix, and in this state, the material exhibits high strength and hardness. It is. The intermetallic compound in the Ni-Cr-Mo cast alloy of this invention has a topologically close-packed structure as described above, but the "topologically close-packed structure" Edited by Seizo Nagasaki, “Metal Glossary”, Vol.
According to page 121, it refers to a "crystal structure that has a close-packed structure using atomic groups as one of the constituent units, such as the Laves phase and the σ phase," and specifically refers to the Ni-Cr-Mo ternary phase diagram. This includes intermetallic compounds with compositions corresponding to the σ phase and p phase. Further, the intermetallic compound having the above-mentioned topologically close-packed structure is a Ni-
In a Cr-Mo based casting alloy, after homogenization treatment at a temperature of 1150 to 1250°C, it can be finely and uniformly dispersed and precipitated in the base by heating and holding at a temperature of 850 to 1100°C. Therefore, this invention was made based on the above research results, and includes Cr: more than 23% to 42%, Mo: more than 17% to 28%, (Cr+Mo: more than 45% to 55%). , and if necessary, (a) Fe: 1 to 10%, (b) one or more of W, Cu, and V: 0.1 to 5%, (c) Co: 0.1 to 5%, a metal containing one or more of the above (a) to (c), with the remainder consisting of Ni and unavoidable impurities, and having a topological close-packed structure in the matrix It is a Ni-Cr-Mo based cast alloy that has a structure in which intermediate compounds are dispersed and precipitated, and has high strength, high hardness, and high corrosion resistance. Next, the reason why the composition of the cast alloy of the present invention is limited as described above will be explained. (a) Cr and Mo Cr and Mo components both form a solid solution in the base material and improve its corrosion resistance. ), which has the effect of significantly improving the strength and hardness of the alloy, but even if the content is either Cr or Mo, Cr:
If the content is 23% or less and Mo: 17% or less, the above effect cannot be stably obtained, so it is necessary to make the content more than 23% Cr and more than 17% Mo. However, in this case, Cr and Mo If the total amount of (Cr + Mo) is 45% or less, plastic working is possible, so it is not necessarily necessary to manufacture cast parts by casting, and therefore it is necessarily necessary to manufacture cast parts by casting. The lower limit of (Cr + Mo) is more than 45%, and on the other hand, even if either Cr or Mo exceeds 42% for Cr and 28% for Mo, the content of both If the content exceeds 55%, the fluidity of the molten metal will deteriorate, making it difficult to manufacture small items or complex-shaped castings. 28%
Cr+Mo: more than 45% to 55%. (b) Fe The Fe component has the effect of not impairing the alloy properties even if it partially replaces Ni, so some of the Ni content may be replaced with Fe for economic reasons. If the content is less than 1%, the desired economic effect cannot be obtained, while if the content exceeds 10%, the corrosion resistance deteriorates, so the content was set at 1 to 10%. (c) W, Cu, and V These components have the effect of further improving the corrosion resistance of the alloy, so they are included as necessary especially when even higher corrosion resistance is required, but their content is If the content is less than 0.1%, the desired corrosion resistance improvement effect cannot be obtained; on the other hand, if the content is 5%
Since casting defects will occur if the content exceeds 0.1% to 5%. (d) Co The Co component has the effect of increasing mechanical properties, especially hardness, and improving wear resistance, so it is included as necessary when these properties are required. If the content is less than 0.1%, the desired hardness improvement effect cannot be obtained, and on the other hand, if the content exceeds 5%, no further improvement effect can be obtained. quantity
It was set at 0.1-5%. (e) Unavoidable impurities Mn, Mg, C, and Si are unavoidable impurities because deoxidizing agents and desulfurizing agents are used during alloy melting.
However, if these contents are respectively 0.1% or less for Mn, 0.05% or less for Mg, 0.2% or less for C, and 0.8% or less for Si, there is no problem with the alloy properties. It's not something you can do. [Example] Next, the Ni-Cr-Mo based casting alloy of the present invention will be specifically explained with reference to Examples. Molten metals having the respective compositions shown in Table 1 are prepared in an Ar atmosphere using a normal high frequency furnace, and cast into castings with dimensions of diameter: 60 mm × length: 200 mm. was homogenized at a predetermined temperature within the range of 1150 to 1250℃ for 10 hours, and then heated to a predetermined temperature within the range of 850 to 1100℃ for 3 hours.
Castings of the casting alloys 1 to 26 of the present invention were manufactured by performing heat treatment under conditions of time holding to finely and uniformly disperse and precipitate the TCP phase in the matrix. For the purpose of comparison, conventional corrosion resistant Excellent Ni-based casting
【表】【table】
第１表に示される結果から、本発明鋳造合金１
〜26は、いずれも従来鋳造合金１〜３と同等ある
いはこれ以上のすぐれた耐食性を示し、かつこれ
より著しく高い強度と硬さをもつことが明らかで
ある。
上述のように、この発明のNi−Cr−Mo系鋳造
合金は、すぐれた耐食性と共に高強度と高硬度を
有するので、これを特に耐食性が要求される産業
分野に用いた場合に、軽量化と薄肉化をはかるこ
とができるようになるのである。
From the results shown in Table 1, it can be seen that the cast alloy 1 of the present invention
It is clear that alloys Nos. 1 to 26 all exhibit excellent corrosion resistance equivalent to or better than conventional cast alloys 1 to 3, and have significantly higher strength and hardness. As mentioned above, the Ni-Cr-Mo cast alloy of the present invention has excellent corrosion resistance, high strength, and high hardness, so when it is used in industrial fields where corrosion resistance is particularly required, it can be used to reduce weight. This makes it possible to achieve thinner walls.
Claims (1)
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ２ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Fe：１〜10％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ３ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Ｗ、Cu、およびＶのうちの１種または２種以
上：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ４ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Co：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ５ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Fe：１〜10％、 Ｗ、Cu、およびＶのうちの１種または２種以
上：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ６ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Fe：１〜10％、 Co：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ７ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Ｗ、Cu、およびＶのうちの１種または２種以
上：0.1〜５％、 Co：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。 ８ Cr：23％超〜42％、 Mo：17％超〜28％、 （ただしCr＋Mo：45％超〜55％）、 を含有し、さらに、 Fe：１〜10％、 Ｗ、Cu、およびＶのうちの１種または２種以
上：0.1〜５％、 Co：0.1〜５％、 を含有し、残りがNiと不可避不純物からなる組
成（以上重量％）を有し、かつ素地中に位相的最
密構造を有する金属間化合物が分散析出した組織
を有することを特徴とする高強度、高硬度、およ
び高耐食性を有するNi−Cr−Mo系鋳造合金。[Claims] 1. A composition containing 1 Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), with the remainder consisting of Ni and inevitable impurities. Ni-Cr- has high strength, high hardness, and high corrosion resistance, and has a structure in which intermetallic compounds having a topologically close-packed structure are dispersed and precipitated in the matrix. Mo based casting alloy. 2 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further contains Fe: 1 to 10%, and the rest is High strength, high hardness, and high Ni-Cr-Mo cast alloy with corrosion resistance. 3 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further contains one or two of W, Cu, and V. Species or more: 0.1 to 5%, with the remainder consisting of Ni and unavoidable impurities (weight%), and a structure in which intermetallic compounds having a topological close-packed structure are dispersed and precipitated in the matrix. A Ni-Cr-Mo based casting alloy having high strength, high hardness, and high corrosion resistance. 4 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), furthermore contains Co: 0.1 to 5%, and the rest is High strength, high hardness, and high Ni-Cr-Mo cast alloy with corrosion resistance. 5 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further contains Fe: 1 to 10%, W, Cu, and V An intermetallic material containing one or more of the following: 0.1 to 5%, with the remainder consisting of Ni and unavoidable impurities (weight percent), and having a topologically close-packed structure in the matrix. A Ni-Cr-Mo cast alloy having high strength, high hardness, and high corrosion resistance, characterized by having a structure in which compounds are dispersed and precipitated. 6 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further Fe: 1 to 10%, Co: 0.1 to 5%. , with the remainder consisting of Ni and unavoidable impurities (weight%), and has a structure in which intermetallic compounds having a topologically close-packed structure are dispersed and precipitated in the matrix. Ni-Cr-Mo based casting alloy with strength, high hardness, and high corrosion resistance. 7 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further contains one or two of W, Cu, and V. An intermetallic material having a composition (by weight %) containing: 0.1 to 5% Co, 0.1 to 5% Co, and the remainder consisting of Ni and unavoidable impurities, and having a topological close-packed structure in the matrix. A Ni-Cr-Mo cast alloy having high strength, high hardness, and high corrosion resistance, characterized by having a structure in which compounds are dispersed and precipitated. 8 Contains Cr: more than 23% to 42%, Mo: more than 17% to 28% (however, Cr + Mo: more than 45% to 55%), and further contains Fe: 1 to 10%, W, Cu, and V Contains one or more of the following: 0.1 to 5%, Co: 0.1 to 5%, and the remainder is Ni and unavoidable impurities (weight %), and has a topological composition in the base material. A Ni-Cr-Mo cast alloy having high strength, high hardness, and high corrosion resistance, characterized by having a structure in which intermetallic compounds having a close-packed structure are dispersed and precipitated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17828985A JPS6240337A (en) | 1985-08-13 | 1985-08-13 | Ni-cr-mo alloy for casting having high strength, high hardness and high corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17828985A JPS6240337A (en) | 1985-08-13 | 1985-08-13 | Ni-cr-mo alloy for casting having high strength, high hardness and high corrosion resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6240337A JPS6240337A (en) | 1987-02-21 |
| JPH0257138B2 true JPH0257138B2 (en) | 1990-12-04 |
Family
ID=16045862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17828985A Granted JPS6240337A (en) | 1985-08-13 | 1985-08-13 | Ni-cr-mo alloy for casting having high strength, high hardness and high corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6240337A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69404937T2 (en) * | 1993-09-20 | 1998-01-15 | Mitsubishi Materials Corp | Nickel alloy |
| US6280540B1 (en) * | 1994-07-22 | 2001-08-28 | Haynes International, Inc. | Copper-containing Ni-Cr-Mo alloys |
| JP5855357B2 (en) * | 2011-05-26 | 2016-02-09 | 山陽特殊製鋼株式会社 | Ni-based boride-dispersed corrosion-resistant wear-resistant alloy |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161050A (en) * | 1979-06-04 | 1980-12-15 | Hitachi Ltd | Sliding structure |
| JPS5925941A (en) * | 1982-08-02 | 1984-02-10 | Mitsubishi Metal Corp | Cylinder and screw member for injection molding machine and extruder for plastic material and its production |
| JPS60178290A (en) * | 1984-02-27 | 1985-09-12 | Mitsubishi Heavy Ind Ltd | Condenser |
-
1985
- 1985-08-13 JP JP17828985A patent/JPS6240337A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6240337A (en) | 1987-02-21 |
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