2010 Fiscal Year Final Research Report
Effects of high pressure hydrogen on materials failure studied By a new simple testing method.
| Project/Area Number |
20360321
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
OGATA Toshio National Institute for Materials Science, 材料信頼性センター, センター長 (20354243)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBATA Kouji 独立行政法人物質・材料研究機構, 材料信頼性センター, NIMS特別研究員 (90011121)
YURI Tetsumi 独立行政法人物質・材料研究機構, 材料信頼性センター, 主任研究員 (10354242)
ONO Yoshinori 独立行政法人物質・材料研究機構, 材料信頼性センター, 主任研究員 (90354240)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 強度 / 靭性 / 破壊 / 疲労 / クリープ / 応力腐食割れ / 超塑性 / 水素脆性 |
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| Research Abstract |
A very simple and safe mechanical properties testing procedure to evaluate hydrogen environment embrittlement (HEE) in the environment of high pressure and low temperature hydrogen has been developed. In this method the high-pressure hydrogen environment is produced inside the hole in the specimen. With this testing method, effects of HEE on the tensile properties for austenitic stainless steels and movement of hydrogen gas just before the specimen failure were investigated.
The effect of HEE increased with hydrogen pressure and the decrease of temperature, however, it decreased below 190K and almost disappeared at cryogenic temperatures, below 120K even in 70MPa. Although it was assumed that hydrogen would be moved abruptly just before the specimen failure, no hydrogen was detected before th failure. Through the discussion using computer simulation, it is considered that even aα'b.c.c. phase, concentration of hydrogen decreased before the specimensurfce.
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