Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron
Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron
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DOI：
10.1016/j.scriptamat.2017.06.037
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发表时间：
2017-11
影响因子：
6
通讯作者：
Yuhei Ogawa;Domas Birenis;H. Matsunaga;A. Thøgersen;Ø. Prytz;O. Takakuwa;J. Yamabe
中科院分区：
文献类型：
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作者：
Yuhei Ogawa;Domas Birenis;H. Matsunaga;A. Thøgersen;Ø. Prytz;O. Takakuwa;J. Yamabe
为了研究氢对纯铁疲劳裂纹尖端塑性变形行为的影响，采用了电子沟道衬度成像（ECCI）、电子背散射衍射（EBSD）和透射电镜（TEM）等多尺度观测技术。分析表明，氢大大减少了断裂路径周围位错结构的演化，并使塑性流动局限在裂纹尖端区域。这些明确的证据可以强化现有的模型，其中这种类型的局部塑性有助于氢气氛中金属的裂纹生长加速，但尚未通过实验阐明。
In order to study the influence of hydrogen on plastic deformation behavior in the vicinity of the fatigue crack-tip in a pure iron, a multi-scale observation technique was employed, comprising electron channeling contrast imaging (ECCI), electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM). The analyses successfully demonstrated that hydrogen greatly reduces the dislocation structure evolution around the fracture path and localizes the plastic flow in the crack-tip region. Such clear evidence can reinforce the existing model in which this type of localized plasticity contributes to crack-growth acceleration in metals in hydrogen atmosphere, which has not yet been experimentally elucidated.