Effect of Hydrogen Environment on Fretting Fatigue

摘要

To clarify the effect of hydrogen gas on fretting fatigue of stainless steel SUS304 and aluminum alloy A6061, fretting fatigue tests were done in hydrogen gas, nitrogen gas and air. The gas pressure was 0.12 MPa. Fretting fatigue strength of both materials decreased in the order of air, nitrogen gas and hydrogen gas. Tangential force coefficient increased in the reverse order. The values of tangential force coefficient corresponding to fretting fatigue limit were almost the same regardless of the environment. Therefore, the difference of fretting fatigue strength was considered to be caused by the difference of tangential force in each environments. In ease of SUS304 which had relatively large slip amount, the appearance of fretting pit and microcrack showed distinct difference among environments.