Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron–silicon alloy

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• 作者：Yoshimasa Takahashi^a ; ^{yoshim.takahashi@aist.go.jp} ; Junji Sakamoto^b ; Masaki Tanaka^c ; Kenji Higashida^c ; Hiroshi Noguchi^b
• 关键词：Fatigue ; Hydrogen ; EBSD ; TEM ; Crack tip
• 刊名：Scripta Materialia
• 出版年：2011
• 出版时间：April 2011
• 年：2011
• 卷：64
• 期：8
• 页码：721-724
• 全文大小：548 K

文摘

The effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron–silicon alloy was investigated by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. In contrast to the previously reported results in an inert environment, no dislocation cells were formed around the crack tip in a hydrogen environment. The microscopic features around the crack tip suggest that hydrogen promotes a mode I-type crack growth mechanism, which reasonably explains the observed macroscopic crack growth property.