大気圧水素雰囲気下での二,三の機関材料の高温強度 : 疲労・クリープ相互効果について

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In the gaseous hydrogen environment, iron containing alloys or steels often suffer rupture as hydrogen emblittlement or hydrogen attack. Forecasting the use of hydrogen fuel in future, experimental investigations on the low-cycle fatigue and creep-rupture properties of three kinds of hot parts materials for conventional internal combustion engine have been conducted. Since the investigations have been aimed primarily at obtaining the fundamental characteristics, the experimental work was carried out under the atmospheric pressure with the materials of diesel engine and gas turbine. The specimens were made of spheroidal graphite cast iron FCD 45, chromium molybdenum cast steel and higher chromium content cast nickel base superalloy IN 939. To arrange our knowledge and in reference to the work, this report also attempted to prevent various types of hydrogen emblittlement above all at elevated temperature in Appendix. Summarizing these studies the following conclusions are obtained : 1. On the creep-rupture strength each material shows no difference between in hydrogen and in air. 2. Life on the strain-controlled low-cycle fatigue of Cr-Mo cast steel is longer in hydrogen gas than in air. On the other hand the life of spheroidal graphite cast iron FCD 45 appears shorter than in air by load controlled test. 3. In hydrogen gas the proposed fatigue life estimation method based on creep-fatigue interaction predicts the life with accuracy as same as in air. 4. The hydrogen pressure level and dwelling period are important variables and will influence the test results. Therefore, prior to practical service of hydrogen fueled engine the fatigue and creep-rupture strength should be further evaluated under the those conditions.
1983-01-30

大気圧水素雰囲気下での二,三の機関材料の高温強度 : 疲労・クリープ相互効果について

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