JPS63235861A - Evaluation of remaining life of heat resistant steel - Google Patents
Evaluation of remaining life of heat resistant steelInfo
- Publication number
- JPS63235861A JPS63235861A JP62069533A JP6953387A JPS63235861A JP S63235861 A JPS63235861 A JP S63235861A JP 62069533 A JP62069533 A JP 62069533A JP 6953387 A JP6953387 A JP 6953387A JP S63235861 A JPS63235861 A JP S63235861A
- Authority
- JP
- Japan
- Prior art keywords
- resistant steel
- replica
- heat resistant
- life
- heat
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000011156 evaluation Methods 0.000 title claims description 5
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 230000007547 defect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 13
- 239000002244 precipitate Substances 0.000 claims description 9
- 230000006866 deterioration Effects 0.000 claims description 7
- 238000000605 extraction Methods 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000011800 void material Substances 0.000 abstract description 2
- 239000012925 reference material Substances 0.000 abstract 3
- 238000005336 cracking Methods 0.000 abstract 2
- 230000000593 degrading effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000840267 Moma Species 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Landscapes
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、高温応力下で使用される機械部品の余寿命評
価に適用される耐熱鋼の余寿命評価方法に関する〇
〔従来の技術〕
従来、機械部品に使用されている耐熱鋼の余寿命評価方
法としては、目視検査、Ｆｆｉ粉探傷検査。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for evaluating the remaining life of heat-resistant steel that is applied to evaluating the remaining life of mechanical parts used under high temperature stress. , Visual inspection and FFI powder flaw detection are methods for evaluating the remaining life of heat-resistant steel used in mechanical parts.
超音波探傷検査或は放射線透過検査等の寿命末期に発生
する亀裂を検出する方法や、レプリカ法によるクリープ
ボイド、微視亀裂を検出する方法及び耐熱鋼を切断して
クリープ破断試験に供してその破断時間から余寿命を評
価するものが知られている。There are methods for detecting cracks that occur at the end of life, such as ultrasonic inspection or radiographic inspection, methods for detecting creep voids and microcracks using the replica method, and methods for detecting creep voids and microcracks by cutting heat-resistant steel and subjecting it to creep rupture tests. It is known that the remaining life is evaluated based on the rupture time.
しかし、亀裂を検出する非破壊検査では、寿命の末期の
余寿命に関する情報は得られるが、亀裂発生以前の寿命
に関する情報は全く得られない。However, although non-destructive testing for detecting cracks can provide information about the remaining life at the end of the life, it cannot provide any information about the life before cracks occur.
また、レプリカ法によるクリープボイド及び微視亀裂の
検出による方法でも、微視亀裂発生以前の耐熱鋼の余寿
命に関する情報は全く得られなかった。更に、クリープ
破断試験による方法では、実際に使用されている部材か
ら試験片を採取して長時間の試験を行う必要があった。Further, even with the method of detecting creep voids and microcracks using the replica method, no information on the remaining life of the heat-resistant steel before the occurrence of microcracks could be obtained. Furthermore, in the creep rupture test method, it was necessary to take a test piece from the member actually used and conduct the test over a long period of time.
本発明は、かかる点に鑑みてなされたものであシ、高温
応力下で長時間使用されている耐熱鋼の余寿命を非破壊
的にしかも容易かつ短時間で高い精度で評価することが
できる耐熱鋼の余寿命評価方法を提供するものである。The present invention has been made in view of these points, and is capable of non-destructively evaluating the remaining life of heat-resistant steel that has been used for long periods of time under high-temperature stress with high accuracy, easily, and in a short time. This provides a method for evaluating the remaining life of heat-resistant steel.
本発明は、耐熱鋼の表面からレプリカ及び抽出レプリカ
を採取する工程と、該レプリカに転写された前記耐熱鋼
の凹凸から亀裂及びクリープボイドの欠陥分布を決定し
、該欠陥分布と前記耐熱鋼の残存寿命率の相関特性を決
定する工程と、前記レプリカに転写された金属組織から
該金属組織の劣化状態を決定すると共に、前記抽出レプ
リカに抽出された析出物の分布を決定し、該劣化状態及
び該析出物の分布と前記耐熱鋼の寿命区分との相関特性
を決定する工程と、前記残存寿命率及び該寿命区分の相
関特性から前記耐熱鋼の寿命を評価することを特徴とす
る耐熱鋼の余寿命評価方法であるＯ
〔作用〕
本発明に係る耐熱鋼の余寿命評価方法によれば、耐熱鋼
の表面からレプリカ及び抽出レプリカを採取する。この
レプリカをもとにして耐熱鋼の欠陥分布と残存寿命率の
相関特性を決定する。また、レプリカをもとにして耐熱
鋼の金属組織の劣化状態を決定すると共に、抽出レプリ
カをもとにして析出物の分布を決定し、この結果と耐熱
鋼の寿命区分との相関特性を決定する。このようにして
得た欠陥分布と残存寿命率の相関特性と、劣化状態及び
析出物の分布と寿命区分の相関特性から、実際に使用さ
れている耐熱鋼の余寿命を、寿命初期から末期に亘って
非破壊的に且つ短時間に評価するＯ
〔実施例〕
以下、本発明の実施例について図面を参照して説明する
。因は、本発明の実施例の工程を示す流れ図である。先
ず、高温・応力下で使用されている耐熱鋼の表面からレ
プリカ１及び抽出レプリカ７を採取する０次に、採取し
たレプリカ１を光学顕微鏡２に装着し、亀裂及び微視亀
裂３の有無を調査すると共に、金属組織４の劣化状況を
調査し、この結果を予め準備した寿命消費が既知（クリ
ープ破断試験等により）の標準組織と対比して、該耐熱
鋼の寿命区分を判定する。The present invention includes a step of collecting replicas and extracted replicas from the surface of heat-resistant steel, determining the defect distribution of cracks and creep voids from the unevenness of the heat-resistant steel transferred to the replica, and determining the defect distribution and the extraction replica of the heat-resistant steel. Determining the correlation characteristics of the remaining life rate, determining the state of deterioration of the metal structure from the metal structure transferred to the replica, determining the distribution of precipitates extracted to the extracted replica, and determining the state of deterioration of the metal structure transferred to the replica. and a step of determining the correlation characteristic between the distribution of the precipitates and the life classification of the heat resistant steel, and evaluating the life of the heat resistant steel from the correlation characteristic of the remaining life rate and the life classification. According to the method for evaluating the remaining life of heat-resistant steel according to the present invention, a replica and an extracted replica are collected from the surface of the heat-resistant steel. Based on this replica, the correlation between defect distribution and remaining life rate of heat-resistant steel will be determined. In addition, we determined the state of deterioration of the metal structure of the heat-resistant steel based on the replica, determined the distribution of precipitates based on the extracted replica, and determined the correlation between these results and the life classification of the heat-resistant steel. do. Based on the correlation between defect distribution and remaining life rate obtained in this way, and the correlation between deterioration state and precipitate distribution and life classification, the remaining life of heat-resistant steel actually used can be estimated from the beginning of life to the end of life. [Examples] Examples of the present invention will be described below with reference to the drawings. 1 is a flowchart showing the steps of an embodiment of the present invention. First, replica 1 and extraction replica 7 are collected from the surface of heat-resistant steel used under high temperature and stress conditions.Next, the collected replica 1 is attached to optical microscope 2, and the presence or absence of cracks and microcracks 3 is examined. At the same time, the deterioration status of the metal structure 4 is investigated, and the life classification of the heat-resistant steel is determined by comparing the results with a standard structure whose life consumption is known (by creep rupture test, etc.) prepared in advance.
次に、レプリカノを走査型電子顕微鏡５に装着して、ク
リープボイド６の有無及び分布状況を調査し、寿命区分
の判明した標準組織４との対比によシ該耐熱銅の寿命区
分を判定する。また、同じ位置から採取した抽出レプリ
カ７を透過型電子顕微鏡８に装着して、析出物の分布状
況を調査し、寿命区分の判明している耐熱鋼と同材から
なる標準材４との対比によシ、該耐熱鋼の寿命区分を判
定する。Next, the replicano is attached to the scanning electron microscope 5 to investigate the existence and distribution of creep voids 6, and the life classification of the heat-resistant copper is determined by comparison with the standard structure 4 whose life classification has been determined. . In addition, the extraction replica 7 taken from the same location was attached to a transmission electron microscope 8 to investigate the distribution of precipitates, and comparison was made with a standard material 4 made of heat-resistant steel and the same material whose life classification was known. Then, determine the life classification of the heat-resistant steel.
然る後、上述の各調査にて判定した該耐熱鋼の亀裂及び
微視亀裂の分布状況に基づく寿命区分。After that, the lifespan is classified based on the distribution of cracks and microcracks in the heat-resistant steel determined in each of the above-mentioned surveys.
クリープボイドの分布状況に基づく寿命区分、金属組織
の変化に基づく寿命区分及び析出物の分布状況に基づく
寿命区分から該耐熱鋼の余寿命評価１０を行う〇
因みに、火力発電用ボイラ過熱器管として長時間使用さ
れた２ ’／４ Ｃｒ−Ｉ ＭｏＭＡ 、 Ｂ 、 Ｃ
について、本発明方法によシ余寿命評価を行ったところ
下記表に示す結果を得た。これと比較するため従来のク
リープ破断試験による余寿命評価を同様に行ったところ
同表に併記する結果を得た０同表から明らかなように本
発明方法では、従来の方法に比べて高い精度で耐熱鋼の
寿命評価を非破壊で容易かつ短時間にできることが確認
された。The remaining life of the heat-resistant steel is evaluated based on the life classification based on the distribution of creep voids, the life classification based on changes in the metal structure, and the life classification based on the distribution of precipitates.Incidentally, as a boiler superheater tube for thermal power generation, 2'/4 Cr-I MoMA, B, C used for a long time
When the remaining life was evaluated using the method of the present invention, the results shown in the table below were obtained. In order to compare with this, we conducted the remaining life evaluation using the conventional creep rupture test and obtained the results shown in the same table. It was confirmed that life evaluation of heat-resistant steel can be easily and quickly performed non-destructively.
表
〔発明の効果〕
以上説明した如く、本発明に係る耐熱鋼の余寿命評価方
法によれば、高温応力下で長時間使用されている耐熱１
゛りの余寿命を非破壊的にしかも容易かつ短時間で高い
精度で評価することができる。Table [Effects of the Invention] As explained above, according to the method for evaluating the remaining life of heat-resistant steel according to the present invention, heat-resistant 1
The remaining life of the vehicle can be evaluated non-destructively, easily, quickly and with high accuracy.
その結果、耐熱鋼の信頼性を向上させて計画的な保守管
理の実現に寄与するものである。As a result, the reliability of heat-resistant steel is improved, contributing to the realization of planned maintenance management.
図は、本発明の実施例の工程を示す流れ図でちる。
ノ・・・レプリカ、２・・・光学顕微鏡、３・・・微視
亀裂、４・・・金属組織、５・・・走査型電子顕微鏡、
６・・・クリープボイド、７・・・抽出レプリカ、８・
・・透過型電子顕微鏡、９・・・析出物の分析状況、１
θ・・・余寿命評価。The figure is a flowchart showing the steps of an embodiment of the invention.ノ...Replica, 2...Optical microscope, 3...Microcracks, 4...Metal structure, 5...Scanning electron microscope,
6...Creep Void, 7...Extraction Replica, 8.
...Transmission electron microscope, 9...Analysis status of precipitates, 1
θ...Remaining life evaluation.
Claims (1)
工程と、該レプリカに転写された前記耐熱鋼の凹凸から
亀裂及びクリープボイドの欠陥分布を決定し、該欠陥分
布と前記耐熱鋼の残存寿命率の相関特性を決定する工程
と、前記レプリカに転写された金属組織から該金属組織
の劣化状態を決定すると共に、前記抽出レプリカに抽出
された析出物の分布を決定し、該劣化状態及び該析出物
の分布と前記耐熱鋼の寿命区分との相関特性を決定する
工程と、前記残存寿命率及び該寿命区分の相関特性から
前記耐熱鋼の寿命を評価することを特徴とする耐熱鋼の
余寿命評価方法。A step of collecting a replica and an extracted replica from the surface of the heat-resistant steel, determining the defect distribution of cracks and creep voids from the unevenness of the heat-resistant steel transferred to the replica, and determining the defect distribution and the remaining life rate of the heat-resistant steel. a step of determining correlation characteristics, determining the state of deterioration of the metal structure from the metal structure transferred to the replica, determining the distribution of precipitates extracted to the extracted replica, and determining the state of deterioration and the state of the precipitates; Remaining life evaluation of heat-resistant steel, comprising: determining a correlation characteristic between a distribution of Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62069533A JPH07117531B2 (en) | 1987-03-24 | 1987-03-24 | Method for evaluating remaining life of heat-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62069533A JPH07117531B2 (en) | 1987-03-24 | 1987-03-24 | Method for evaluating remaining life of heat-resistant steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63235861A true JPS63235861A (en) | 1988-09-30 |
| JPH07117531B2 JPH07117531B2 (en) | 1995-12-18 |
Family
ID=13405458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62069533A Expired - Lifetime JPH07117531B2 (en) | 1987-03-24 | 1987-03-24 | Method for evaluating remaining life of heat-resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07117531B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123859A (en) * | 1989-10-06 | 1991-05-27 | Hitachi Ltd | Method and device for easy deterioration decision making |
| WO2005017508A1 (en) * | 2003-08-04 | 2005-02-24 | Basf Coatings Ag | Method for the characterisation of surface structures and use thereof for the modification development and production of materials |
| JP2015148504A (en) * | 2014-02-06 | 2015-08-20 | 中国電力株式会社 | Method of estimating remaining life of member made of stainless steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960347A (en) * | 1982-09-30 | 1984-04-06 | Toshiba Corp | Method for evaluating deterioration degree of low-alloy heat-resistant steel |
| JPS61172059A (en) * | 1985-01-28 | 1986-08-02 | Mitsubishi Heavy Ind Ltd | Method for nondestructive forecasting of life of turbine |
-
1987
- 1987-03-24 JP JP62069533A patent/JPH07117531B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5960347A (en) * | 1982-09-30 | 1984-04-06 | Toshiba Corp | Method for evaluating deterioration degree of low-alloy heat-resistant steel |
| JPS61172059A (en) * | 1985-01-28 | 1986-08-02 | Mitsubishi Heavy Ind Ltd | Method for nondestructive forecasting of life of turbine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123859A (en) * | 1989-10-06 | 1991-05-27 | Hitachi Ltd | Method and device for easy deterioration decision making |
| WO2005017508A1 (en) * | 2003-08-04 | 2005-02-24 | Basf Coatings Ag | Method for the characterisation of surface structures and use thereof for the modification development and production of materials |
| JP2015148504A (en) * | 2014-02-06 | 2015-08-20 | 中国電力株式会社 | Method of estimating remaining life of member made of stainless steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07117531B2 (en) | 1995-12-18 |
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