成果報告書詳細
管理番号20150000000182
タイトル*平成26年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素供給インフラの国内規制適正化、国際基準調和・国際標準化に関する研究開発 燃料電池自動車及び水素ステーション関連機器向け使用可能鋼材の拡大に関する研究開発 2-3低温および高温ガス環境下での材料特性に関する研究
公開日2015/6/25
報告書年度2014 - 2014
委託先名独立行政法人物質・材料研究機構
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Research and Development on Hydrogen Utilization Technology
Research and Development on the Adjustment of Domestic Regulations, International Standard Harmonization and International Standardization for Fuel Cell Vehicles and Hydrogen Supply Infrastructure
Research and Development on the Expansion of Utilizable Steel for Fuel Cell Vehicles and Hydrogen Stations
Subject 2-3 Research on Material Properties under Cryogenic to Higher Temperatures and Gas Environment

Summary of FY2014 from FY2013 to FY 2017

Using a simple testing method for mechanical properties in high-pressure hydrogen gas environments, the effects of hydrogen environment embrittlement (HEE) on tensile properties of a high Ni SUS316L (Ni equivalent >28.5) and a low Ni SUS316L (Ni=12%) at 70 MPa at room temperature to 190 K were evaluated. The crosshead-speed during tensile test was 3.6 mm/h. The effect of HEE is evaluated by the ratio of reduction of area (relative reduction of area) obtained in tensile tests using the specimen filled in hydrogen gas to that obtained in helium gas.
The relative reduction of area (RRA) of the high Ni SUS316L (H316L) was 0.95 even at 190 K, so there is almost no effect of HEE for H316L. The RRA for the low Ni SUS316L (L316L) was less than 0.5 at the lower temperatures and there is an effect of HEE for L316L.
In order to understand the HEE, 11 MPa hydrogen was exchanged to 10 MPa helium gas during tensile testing. For L316L the hydrogen was exchanged at the peak point of load for hydrogen environment, then the HEE was gone away and the specimen deformed in helium gas environment from the beginning of the test. For SUS630 the exchanges were carried out at 1000 MPa, 1100 MPa, and 1200 MPa at 298 K and at 752 MPa at 260 K. At 298 K the 0.2 % proof stress of SUS630 was around 1236 to 1284 MPa and almost no HEE after the exchange up to 11MPa but at 1200 MPa the specimen was failed during the exchange. At 260 K the 0.2 % proof stress was more than 1370 MPa but due to the HEE the specimen were failed at 1020 MPa or 832 MPa in hydrogen environment, so the exchange was carried out at 752 MPa then almost no HEE after the exchange.
The effectiveness of the gas change during tensile tests for the study on HEE was confirmed this year and more tensile tests in various kinds of conditions will be performed in following years.
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