240 析出硬化型マルテンサイト系ステンレス鋼SUS630の疲労き裂進展挙動に及ぼす水素の影響(OS8-2 水素環境が金属強度特性に及ぼす影響,OS8 水素環境が金属強度特性に及ぼす影響)

概要

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The effect of hydrogen on fatigue crack growth behavior was investigated in SUS630 with hydrogen-charged specimens at different test frequencies. The fatigue crack growth rate was increased by hydrogen-charge. The fatigue crack growth rate of the hydrogen-charged specimen increased with decreasing test frequency from 20 Hz to 0.2 Hz. The fatigue crack path became thinner by hydrogen-charge. It was presumed to be caused by localization of slip at the crack tip by hydrogen. These factors cause the acceleration in fatigue crack growth rates in the hydrogen-charged specimens. Fatigue fracture surface observation shows that, in the hydrogen-charged specimens, there were a lot of circular-shaped patterns which were presumed to be formed by synergistic effect of cyclic loading and hydrogen concentration ahead of the main crack with a strong hydrostatic tension at the higher ΔK region. The coalescence of the main crack with advanced small cracks also causes the acceleration of fatigue crack growth rates in the hydrogen-charged specimens at the higher ΔK region.
一般社団法人日本機械学会の論文
2007-10-24