OS0720 炭素鋼S45Cの疲労特性に及ぼす水素の影響(構造用材料の疲労挙動と寿命評価,オーガナイズドセッション)

概要

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The effect of hydrogen on fatigue properties for S45C carbon steel tempered at 550℃ were investigated using smooth and notched specimens at frequencis of 0.02Hz through 30Hz under stress ratio of R=-1. In the case of smooth specimens, fatigue strength showed negligible difference between hydrogen charged and uncharged specimens. On the other hand, fatigue lives for notched specimens decreased with decreasing in frequency in the presence of hydrogen. However, the decrease in fatigue lives of hydrogen charged specimens was saturated with 1/10 of fatigue lives of uncharged specimens. The results of smooth and notched specimens show thst hydogen strongly influences on fatigue crak propagation rather than on fatigue crack initiation. The brittle fracture appearances such as the intergranular fracture were not found at the fracture origins even for hydrogen charged specimens. Accordingly, the decrease in fatigue life, that is, the acceleration of fatigue crack propagation for hydrogen charged specimens could be explained by the hydrogen enhanced localized plasticity model rather then by the hydrogen decohesion model.
一般社団法人日本機械学会の論文
2009-07-24