JPS5914186B2 - Non-destructive testing method for corrosion-resistant alloys - Google Patents
Non-destructive testing method for corrosion-resistant alloysInfo
- Publication number
- JPS5914186B2 JPS5914186B2 JP53065124A JP6512478A JPS5914186B2 JP S5914186 B2 JPS5914186 B2 JP S5914186B2 JP 53065124 A JP53065124 A JP 53065124A JP 6512478 A JP6512478 A JP 6512478A JP S5914186 B2 JPS5914186 B2 JP S5914186B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- resistant alloys
- eddy current
- destructive testing
- testing method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005260 corrosion Methods 0.000 title claims description 24
- 230000007797 corrosion Effects 0.000 title claims description 24
- 229910045601 alloy Inorganic materials 0.000 title claims description 16
- 239000000956 alloy Substances 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 10
- 238000009659 non-destructive testing Methods 0.000 title claims description 4
- 238000011084 recovery Methods 0.000 claims description 6
- 230000005291 magnetic effect Effects 0.000 claims description 3
- 229910017060 Fe Cr Inorganic materials 0.000 claims description 2
- 229910002544 Fe-Cr Inorganic materials 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
- 229910019589 Cr—Fe Inorganic materials 0.000 claims 1
- 229910018487 Ni—Cr Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 12
- 206010070834 Sensitisation Diseases 0.000 description 8
- 230000008313 sensitization Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 229910018106 Ni—C Inorganic materials 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 230000001066 destructive effect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000013077 target material Substances 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910001026 inconel Inorganic materials 0.000 description 2
- 229910001055 inconels 600 Inorganic materials 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000272534 Struthio camelus Species 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Description
【発明の詳細な説明】
この発明は耐食性合金の新規な非破壊的検査方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION This invention relates to a novel non-destructive testing method for corrosion-resistant alloys.
Ｎｉ−Ｃに−Ｆｅ系、Ｆｅ−Ｎｉ−Ｃに系、Ｆｅ−Ｃに
−Ｎｉ系などの耐食性合金は、５００〜７００℃で加熱
履歴を受けると、鋭敏化を生じて、耐食性が低下する（
鋭敏化現象）。Corrosion-resistant alloys such as Ni-C and -Fe systems, Fe-Ni-C systems, and Fe-C and -Ni systems become sensitized and reduce their corrosion resistance when subjected to heating history at 500 to 700°C. (
sensitization phenomenon).
ところが、さらに５００〜８００℃で長時間の加熱履歴
を与えてやると、耐食性が回復することが知られている
（鋭敏化回復現象）。とくに、１３Ｃｒ鋼やインコ＊表
示の化学成分を有するインコネル（Ｉｎｃｏｎｅｌ）＊
ネル６００（７５Ｎｉ−１０Ｆｅ−１５Ｃｒ系）などの
合金は、５００〜８００℃で比較的短時間（１〜１００
Ｈ）の加熱履歴を与えることにより、耐食性が回復する
ことが知られている。５ したがつて、耐食性合金の品
質管理では、合金が鋭敏化の状態にあるのか回復した状
態にあるのかを検査し、鋭敏化を起していれば、これを
回復させて、実用に供すべきである。However, it is known that if the material is further subjected to a long heating history at 500 to 800°C, the corrosion resistance will recover (sensitization recovery phenomenon). In particular, 13Cr steel and Inconel*, which has a chemical composition indicated as Inco*.
Alloys such as Nell 600 (75Ni-10Fe-15Cr series) can be used at 500-800°C for a relatively short period of time (1-100°C).
It is known that corrosion resistance can be restored by applying the heating history of H). 5 Therefore, in quality control of corrosion-resistant alloys, it is necessary to inspect whether the alloy is in a sensitized state or in a recovered state, and if sensitization has occurred, it should be restored and used for practical use. It is.
従来のこの種の検査方法としては、ストラウス１０試験
（沸騰硫酸・硫酸銅溶液を使用）、ヒユーイ試験（沸騰
６５％硝酸溶液を使用）、ストライカー試験（沸騰硫酸
・硫酸第二鉄溶液を使用）などの粒界腐食試験が知られ
ているが、これらは全て破壊的試験法であり、非破壊的
に合金を検査でき１５る方法は、現在知られていない。Conventional testing methods of this type include the Strauss 10 test (using a boiling sulfuric acid/copper sulfate solution), Huey test (using a boiling 65% nitric acid solution), and the Stryker test (using a boiling sulfuric acid/ferric sulfate solution). Although intergranular corrosion tests such as 15 are known, these are all destructive test methods, and there is currently no known method that can inspect alloys non-destructively15.
この発明は上記事情を刷新するもので、耐食性合金の非
破壊的検査方法を提供する。The present invention improves on the above situation and provides a method for non-destructive testing of corrosion-resistant alloys.
一般にインコネル６００などの耐食性合金が鋭敏化を起
すと、第１図に示すようにＣｒ欠乏層が２０形成される
。Generally, when a corrosion-resistant alloy such as Inconel 600 becomes sensitized, a Cr-depleted layer 20 is formed as shown in FIG.
これが形成されると、第２図に示す如く磁気変態点であ
るキュリー点が変化し、室温下でも、Ｃｒ欠乏層で常磁
性体から強磁性体に変化する。この発明者らは上記の現
象にヒットを得て、実ク５ 用的な非破壊的検査方法を
開発したものである。When this is formed, the Curie point, which is the magnetic transformation point, changes as shown in FIG. 2, and the material changes from paramagnetic to ferromagnetic in the Cr-depleted layer even at room temperature. The inventors discovered the above phenomenon and developed a non-destructive inspection method for practical use.
すなわちこの発明の検査方法は、Ｎｉ−Ｆｅ一Ｃｒ系、
Ｎｉ−Ｃに−Ｆｅ系、Ｆｅ−Ｎｉ−Ｃに系等の耐食性合
金の、Ｃｒ欠乏層の生成または回復による耐食性や冶金
的性質の変化を知るため、３０透磁率の変化に基づく渦
電流値の変化を測定することを特徴とする。以下、実施
例に則して詳しく説明する。That is, the inspection method of this invention is based on Ni-Fe-Cr system,
In order to understand changes in corrosion resistance and metallurgical properties of corrosion-resistant alloys such as Ni-C and -Fe systems and Fe-Ni-C systems due to the formation or recovery of Cr-depleted layers, 30 eddy current values based on changes in magnetic permeability are used. It is characterized by measuring changes in . Hereinafter, a detailed explanation will be given based on examples.
（％）
６００合金について、溶体化処理（９８０℃×０．５Ｈ
Ａ−Ｃ）を施したもの、これに鋭敏化処理（７００℃×
１５Ｈ）を施したもの、鋭敏化回復処理（７００℃×１
５Ｈ）を施したもの、計３種類の供試材を製作し、モデ
イフアイド・ヒユーイ試験（ＭＯｄｉｆｉｅｄＨｅｕｙ
Ｔｅｓｔ；２５％沸騰硝酸使用）を行なつた。(%) For 600 alloy, solution treatment (980℃ x 0.5H
A-C) and sensitization treatment (700℃×
15H), sensitization recovery treatment (700℃ x 1
A total of three types of test materials were prepared, including those subjected to the Modified Heuy test (MOdified Heuy test).
Test; using 25% boiling nitric acid).
その結果、第３図に明らかなように鋭敏化処理を施した
ものは溶体化材に比べ、腐食減量が大きく、鋭敏化回復
処理を施したものは、溶体化材と同様、腐食減量が小さ
い。As a result, as shown in Figure 3, the corrosion loss of the sensitized material is greater than that of the solution treated material, and the corrosion loss of the sensitized material is smaller, similar to that of the solution treated material. .
一方、これらの材料の渦電流を測定した結果は、第４図
に示すとおりであり、鋭敏化処理を施したものは、溶体
化材に比べ渦電流読み値が小さく、鋭敏化回復処理を施
したものは、溶体化材と同様に渦電流読み値が大きい。On the other hand, the results of measuring the eddy currents of these materials are shown in Figure 4, and the eddy current readings of the sensitized materials are smaller than those of the solution-treated materials, and the eddy current readings of the sensitized materials are smaller than those of the solution-treated materials. eddy current readings are large, similar to solution treated materials.
すなわちこの発明において渦電流の変化を測定すること
は、ヒユーイ試験など腐食試験による粒界腐食感受性を
把握できるわけで、この方法によれば、インコネル６０
０はじめ各種の耐食性合金の耐食性または冶金的性質の
評価を、非破壊的に手軽に行なうことができる。In other words, by measuring changes in eddy current in this invention, it is possible to grasp intergranular corrosion susceptibility by corrosion tests such as the Huey test. According to this method, Inconel 60
It is possible to easily and non-destructively evaluate the corrosion resistance or metallurgical properties of various corrosion-resistant alloys including 0.
この発明は前記実施例に拘束されず、要旨を変えない範
囲で変形で実施することができる。This invention is not limited to the embodiments described above, and can be implemented with modifications without changing the gist.
包括的に三通りのケースを下に紹介すると、（イ）対象
材と同種材質、同一形状の部材（ヒユーイ試験等で腐食
量を明らかにした試験材）を用いて、溶体化処理材、鋭
敏化処理材、鋭敏化回復材を製作し、これを標準材とす
る。これらについて予め渦電流値を測定しておき、対象
材の渦電流値と比較することによつて、対象材の冶金的
性質を把握する。（ロ）多数の対象材のうちから、いく
つかを代表例に選択し、その渦電流値とヒユーイ試験等
による腐食減量とを明らかにし、これらの相関関係を調
べ、予めいくつかの分布を明らかにしておき、残りの対
象材の渦電流値を測定し、その相関データから評価基準
を定めるＯ（ハ）Ｃ量、Ｃｒ量、Ｔｉ量がそれぞれ異な
る対象材につき、予め同一形状の試験材を用いて加熱時
間、加熱温度を変えた条件で、第３図、第４図に示すよ
うな渦電流値および腐食減量を求めておき、対象材のＣ
，Ｃｒ，Ｔｉ量と渦電流値から、そのデータを比級して
、鋭敏化もしくは鋭敏化回復の状態を知る。Three cases are comprehensively introduced below. We will produce chemically treated materials and sensitized recovery materials and use them as standard materials. By measuring the eddy current values of these in advance and comparing them with the eddy current values of the target material, the metallurgical properties of the target material can be grasped. (b) Select some representative examples from a large number of target materials, clarify their eddy current values and corrosion loss by Huey test, etc., investigate the correlation between these, and clarify some distributions in advance. , measure the eddy current values of the remaining target materials, and determine the evaluation criteria from the correlation data. The eddy current value and corrosion loss as shown in Figures 3 and 4 are determined under the conditions of varying the heating time and heating temperature using the C
, Cr, Ti amounts and eddy current values, the data is compared to determine the state of sensitization or sensitization recovery.
以上で明らかなように、この発明は渦電流値の測定を利
用した非破壊的検査方法を提供するものであり、熱交換
器用伝熱管をはじめ、耐食合金製部材全般に適用できる
非破壊的検査手段として、工業的に重要な貢献をするも
のである。As is clear from the above, the present invention provides a non-destructive inspection method that utilizes the measurement of eddy current values, and is a non-destructive inspection method that can be applied to general members made of corrosion-resistant alloys, including heat exchanger tubes. As a means, it makes an important industrial contribution.
第１図および第２図は、インコネル６００等の耐食性合
金の鋭敏化現象を示す線図で、第１図はＣｒ含量と粒界
炭化物までの垂直方向距離との関係を示し、第２図はＣ
ｒ含量とキユ一り温度の関係を示す。Figures 1 and 2 are diagrams showing the sensitization phenomenon of corrosion-resistant alloys such as Inconel 600. Figure 1 shows the relationship between Cr content and vertical distance to grain boundary carbides, and Figure 2 shows the relationship between Cr content and vertical distance to grain boundary carbides. C
The relationship between r content and kyu temperature is shown.
Claims (1)
Ｎｉ−Ｃｒ系等の耐食性合金において、Ｃｒ欠乏層の生
成または回復による耐食性や冶金的性質の変化を知るた
め、透磁率の変化に基づく渦電流値の変化を測定するこ
とを特徴とする耐食性合金の非破壊的検査方法。1 Ni-Fe-Cr system, Ni-Cr-Fe system, Fe-
Corrosion-resistant alloys such as Ni-Cr based alloys, characterized in that changes in eddy current values based on changes in magnetic permeability are measured in order to determine changes in corrosion resistance and metallurgical properties due to the formation or recovery of a Cr-depleted layer. non-destructive testing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53065124A JPS5914186B2 (en) | 1978-05-31 | 1978-05-31 | Non-destructive testing method for corrosion-resistant alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53065124A JPS5914186B2 (en) | 1978-05-31 | 1978-05-31 | Non-destructive testing method for corrosion-resistant alloys |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54156697A JPS54156697A (en) | 1979-12-10 |
| JPS5914186B2 true JPS5914186B2 (en) | 1984-04-03 |
Family
ID=13277803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53065124A Expired JPS5914186B2 (en) | 1978-05-31 | 1978-05-31 | Non-destructive testing method for corrosion-resistant alloys |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5914186B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02120658A (en) * | 1988-10-31 | 1990-05-08 | Nippon Yakin Kogyo Co Ltd | Inspection method for liquid phase sintered alloy with magnetic matrix |
| JP3685767B2 (en) * | 2002-04-12 | 2005-08-24 | 独立行政法人科学技術振興機構 | Nondestructive inspection method and inspection apparatus for intergranular corrosion of nickel-base alloy containing chromium |
| US11536677B2 (en) * | 2016-12-28 | 2022-12-27 | Nuvoton Technology Corporation Japan | Gas detection device, gas sensor system, fuel cell vehicle, and hydrogen detection method |
| CN113607807A (en) * | 2021-08-06 | 2021-11-05 | 中国特种设备检测研究院 | A kind of austenitic stainless steel sensitization damage test classification method and device |
-
1978
- 1978-05-31 JP JP53065124A patent/JPS5914186B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54156697A (en) | 1979-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ebrahimi et al. | A comparative study of critical pitting temperature (CPT) of stainless steels by electrochemical impedance spectroscopy (EIS), potentiodynamic and potentiostatic techniques | |
| Norton | The creep of steel at high temperatures | |
| Amadou et al. | Double loop electrochemical potentiokinetic reactivation test optimization in checking of duplex stainless steel intergranular corrosion susceptibility | |
| Olsson et al. | An AES and XPS study of the high alloy austenitic stainless steel 254 SMO® tested in a ferric chloride solution | |
| CN103063528B (en) | Method for fast evaluating high temperate member residual service life on spot | |
| BR112015013573B1 (en) | test method of a austenitic steel reformer tube. | |
| JPS5914186B2 (en) | Non-destructive testing method for corrosion-resistant alloys | |
| JP3639908B2 (en) | Nondestructive measurement method for aging of ferromagnetic structural materials | |
| Sudharsanam et al. | Evaluation of post weld heat treatment quality of modified 9Cr-1Mo (P91) steel weld by magnetic coercive force measurements | |
| Hasegawa et al. | Development of an eddy current inspection technique with surface magnetization to evaluate the carburization thickness of ethylene pyrolysis furnace tubes | |
| JPS6023303B2 (en) | Method of measuring susceptibility to intergranular corrosion and stress corrosion cracking | |
| Khodamorad et al. | Inspection of carburization and ovalness in ethylene cracking tubes by using a semi-robot | |
| Lois et al. | Assessment of martensite content in austenitic stainless steel specimens by eddy current testing | |
| Chen et al. | Effects of PWHT temperature on mechanical properties of high-Cr ferritic heat-resistant steel weld metals | |
| Chiablam et al. | Eddy current analysis for predicting deterioration stages in alumina former radiant coils | |
| JPS6316257A (en) | Nondestructive simple discrimination method for stainless steel l standard material | |
| JP2003302378A (en) | Non-destructive inspection method and inspection apparatus for intergranular corrosion of nickel-based alloy containing chromium | |
| Acosta et al. | Microstructure-based lifetime assessment of austenitic steel AISI 347 exposed to corrosion and fatigue | |
| Hodžić et al. | Influence of sigma phase on general corrosion of austenitic stainless steel | |
| JPH05223809A (en) | Remaining service life estimating method for gamma' phase precipitation reinforcement type alloy | |
| JPH07128328A (en) | Method of predicting deterioration and remaining life of metallic materials | |
| Jeong et al. | Development of an apparatus for chloride induced stress corrosion cracking test using immersion method with constant displacement condition | |
| JPH03170036A (en) | Temperature hysteresis indicator | |
| Carreon et al. | Phase quantification in a duplex stainless steel welds using NDT techniques | |
| Bong et al. | Nondestructive evaluation for remanent life of modified 9Cr–1Mo steel by reversible magnetic permeability |