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Effects of multiple overloads and hydrogen on high cycle fatigue limit was examined to establish a criterion which assesses whether hydrogen utilization machines can be used after large earthquakes. Test materials were SUS304 and SUS316L. The test environments were 0.6MPa hydrogen gas and air. Hydrogen pre-charged specimen was used for in-hydrogen gas test. The reduction of fatigue strength was caused by overloads in both materials. The cause of the reduction was small cracks formed by overloads. In SUS304, the reduction of fatigue limit was enhanced by hydrogen since propagation of small cracks during overloads was accelerated due to hydrogen. In SUS316L, there was no reduction of fatigue limit due to hydrogen. Maximum overload amplitude which caused no reduction of fatigue limit was 0.5σ0.2 for SUS304 and 0.75σ0.2 for SUS316L. These values were regarded as the upper limits of overload amplitude below which the continuous use of components are allowed after earthquakes.

Effect of Hydrogen Absorption on the Fatigue Strength Reduction Caused by Multiple Overloads in Notched Component