JP4664399B2 - 高Cr系鋼構造物のじん性評価方法 - Google Patents
高Cr系鋼構造物のじん性評価方法 Download PDFInfo
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- JP4664399B2 JP4664399B2 JP2008198193A JP2008198193A JP4664399B2 JP 4664399 B2 JP4664399 B2 JP 4664399B2 JP 2008198193 A JP2008198193 A JP 2008198193A JP 2008198193 A JP2008198193 A JP 2008198193A JP 4664399 B2 JP4664399 B2 JP 4664399B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 47
- 239000010959 steel Substances 0.000 title claims description 47
- 238000011156 evaluation Methods 0.000 title claims description 14
- 230000010287 polarization Effects 0.000 claims description 20
- 229910001068 laves phase Inorganic materials 0.000 claims description 19
- 238000010586 diagram Methods 0.000 claims description 14
- 239000008151 electrolyte solution Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000003792 electrolyte Substances 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 65
- 230000032683 aging Effects 0.000 description 17
- 238000003878 thermal aging Methods 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 238000009863 impact test Methods 0.000 description 5
- 239000003929 acidic solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
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- 238000001556 precipitation Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 206010027146 Melanoderma Diseases 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241001417527 Pempheridae Species 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000005539 carbonized material Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
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- 239000002932 luster Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
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- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Description
駒崎慎一,岸 繁男,庄子 哲雄,千葉秀樹,鈴木 康史,「材料(Vol.49,No.8〜14)」に記載の「W強化型9%Crフェライト系耐熱鋼の熱時効ぜい化と電気化学的手法によるその評価」,社団法人日本材料学会,2000年8月,p.919-926
[課題を解決するための手段及びその効果]
1.上記課題を解決するための、本願発明に係る高Cr系鋼からなる構造物のじん性を評価する方法は、所定の高Cr系鋼について、所定の電解液を用いて得られたアノード分極曲線から所定のパラメータとじん性との間の特性線図を予め求める工程と、前記高Cr系鋼からなる構造物に対して前記電解液を用いてアノード分極曲線から前記パラメータの値を計測する工程と、前記構造物から計測された前記パラメータの値を前記特性線図に当てはめることにより、前記高Cr系鋼からなる構造物のじん性を評価する工程とを有することを特徴とする。
また好ましくは、前記電解液は、pHの値が0より大きく5より小さい酸性溶液である。
また好ましくは、前記パラメータがアノード電流密度の極大値である。
また好ましくは、前記パラメータがアノード電流密度の電気量であり、前記電気量は、アノード電流密度が極小値となる電流密度に対応する電位間における電流密度の積分値である。
また好ましくは、前記アノード分極曲線を求める際の電位掃引速度が100mV/s以下である。
本願発明の実施例を説明する前に、既に知られている計測に用いる装置の例について説明する。
Cr含有量(wt%)が8以上14以下の高Cr系鋼構造物に対してじん性を評価する場合、図1に示すように、電解液4を高Cr系鋼構造物1に直接接触させ、その際、生成される電荷の変化を電気的に検出して、高Cr系鋼構造物1のアノード分極曲線を記録する。高Cr系鋼構造物1はリード線を経てポテンショスタット7に接続されている。
次に、高Cr系鋼としての9Cr-1Mo-Nb-V系耐熱鋼(Cr含有量は8.8wt%)の溶接金属についてじん性評価実験を行った結果について説明する。この耐熱鋼は、Cr、Mo、Nb、V、Si、C、残部Feなどの化学元素で構成されている。勿論、9Cr-1Mo-Nb-V系耐熱鋼は例示であり、その他の高Cr系鋼(Cr含有量が8〜14重量パーセント)についても同様の実験を行うことができる。
続いて、高Cr系鋼としての9Cr-1Mo-Nb-V系耐熱鋼(Cr含有量は8.8wt%)の母材についてじん性評価実験を行った結果について説明する。なお、本明細書において、「母材」とは、被溶接金属材料のことをいう。
4 電解液
5 対極
6 照合電極
7 ポテンシャルスイーパ
10 検出装置
a ラーベス相
b 母相
c 黒点
Claims (3)
- Cr含有量(wt%)が8以上14以下であってラーベス相が析出する高Cr系鋼からなる構造物のじん性を評価する方法において、
前記高Cr系鋼について、硫酸水溶液からなる電解液を用いて得られたアノード分極曲線からアノード電流密度の極大値とじん性との間の特性線図を予め求める工程と、
前記高Cr系鋼からなる構造物に対して前記電解液を用いてアノード分極曲線からアノード電流密度の極大値を計測する工程と、
前記構造物から計測された前記アノード電流密度の極大値を前記特性線図に当てはめることにより、前記高Cr系鋼からなる構造物のじん性を評価する工程とを有することを特徴とする、じん性評価方法。 - 前記電解液は、pHの値が0より大きく5より小さい、請求項1に記載のじん性評価方法。
- 前記アノード分極曲線を求める際の電位掃引速度が100mV/s以下である、請求項1又は2に記載のじん性評価方法。
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JP6963745B2 (ja) * | 2017-09-14 | 2021-11-10 | 富士電機株式会社 | 高Cr鋼のラーベス相検出方法 |
CN108734181B (zh) * | 2018-05-23 | 2019-04-16 | 西安交通大学 | 一种加速在线生成核反应堆堆芯特征线的方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58166250A (ja) * | 1982-03-26 | 1983-10-01 | Toshiba Corp | 金属部材の寿命診断装置 |
JPS5981552A (ja) * | 1983-09-13 | 1984-05-11 | Toshiba Corp | 金属材料の機械的性質の変化を電気化学的に測定する方法 |
JPS61241645A (ja) * | 1985-04-19 | 1986-10-27 | Toshiba Corp | 低合金鋼の劣化判定法 |
JPH0886768A (ja) * | 1994-09-20 | 1996-04-02 | Toshiba Corp | 超耐熱合金鋼の劣化検出方法 |
JPH10227754A (ja) * | 1997-02-17 | 1998-08-25 | Mitsubishi Heavy Ind Ltd | 焼戻しマルテンサイト鋼の高温損傷評価方法 |
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- 2008-07-31 JP JP2008198193A patent/JP4664399B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58166250A (ja) * | 1982-03-26 | 1983-10-01 | Toshiba Corp | 金属部材の寿命診断装置 |
JPS5981552A (ja) * | 1983-09-13 | 1984-05-11 | Toshiba Corp | 金属材料の機械的性質の変化を電気化学的に測定する方法 |
JPS61241645A (ja) * | 1985-04-19 | 1986-10-27 | Toshiba Corp | 低合金鋼の劣化判定法 |
JPH0886768A (ja) * | 1994-09-20 | 1996-04-02 | Toshiba Corp | 超耐熱合金鋼の劣化検出方法 |
JPH10227754A (ja) * | 1997-02-17 | 1998-08-25 | Mitsubishi Heavy Ind Ltd | 焼戻しマルテンサイト鋼の高温損傷評価方法 |
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