The effect of absorbed hydrogen on the torsional fatigue in high cycle region was studied under continuous cathodic polarization condition using three kinds of austenitic stainless steels SUS304, SUS316 and SUS316L. The tensile strengths of these materials were varied into different levels by work hardening, hot drawing and solution heat treatment. The absorbed hydrogen gave a detrimental effect in the case of hardened materials and the fatigue strength was substantially lowered irrespective of chemical composition. In a solution heat-treated material, however, no significant effect was observed. The fatigue behavior of an actual coil spring made of work hardened SUS316 was studied as an application of work hardened material to a component of a hydrogen utilization machine. The fatigue strength was much more significantly lowered than in the case of plain specimen under cathodic polarization. Small meshwork groove existing on the surface of actual spring acted as a defect. This resulted in a significant reduction of fatigue life under cathodically polarized condition. These results suggested that high tensile strength and small defect were detrimental factors for the torsional fatigue of work hardened asustenitic stainless steel used in hydrogen environment.
|ジャーナル||Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|出版ステータス||出版済み - 12 2007|
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