International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments
The Effects of Oxygen Impurities on Fretting Fatigue of Austenitic Stainless Steel in Hydrogen Gas
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To clarify the effect of O2 addition as an impurity in a H2 environment on the fretting fatigue strength of JIS SUS304 austenitic stainless steel, a control method to add ppm-level O2 to a H2 environment was established. The experiments were then carried out in H2 environments with O2 concentrations of 0.088, 5, 35 and 100 vppm. The fretting fatigue strength in the H2 was significantly reduced by the addition of a small amount of O2. The reduction was caused by the change in the stress conditions at the contact part due to the addition of O2 that changed the oxidation and fretting wear behavior on the fretted surface.