SUS304およびSUS316Lにおける微小穴からの極低速度疲労き裂伝ぱに及ぼす低圧水素ガスの影響(<小特集>自動車技術を支える材料力学)

概要

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In order to investigate the hydrogen gas effect on the fatigue limits of austenitic stainless steel SUS304 and SUS316L with small twin blind holes, metal fatigue tests are carried out in a low pressure hydrogen gas, in air and inert gases; argon or nitrogen. The fatigue limit of SUS304 is defined as the crack propagation limit not only in air but also in hydrogen and in nitrogen. And the fatigue limit of SUS304 in hydrogen gas is slightly higher than in air. The extremely low Fatigue Crack Growth Rates (FCGR) of not only SUS304 and but also SUS316L in hydrogen gas is lower than that in argon gas in the region of FCGR lower than 10^<-9>m/cycle. This seems to be due to plasticity-induced crack closure and supports higher fatigue limit in hydrogen.
2009-10-25