Experimental verification of the hydrogen concentration around a crack tip using spot X-ray diffraction
Experimental verification of the hydrogen concentration around a crack tip using spot X-ray diffraction
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DOI：
10.1016/j.ijhydene.2016.10.083
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发表时间：
2016-12
影响因子：
7.2
通讯作者：
O. Takakuwa;T. Fujisawa;H. Soyama
中科院分区：
文献类型：
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作者：
O. Takakuwa;T. Fujisawa;H. Soyama
我们采用X射线衍射使用准直X射线定量评估局部氢浓度的金属行为。氢集中在裂纹尖端周围显著加速裂纹扩展，即，氢脆为了阐明导致这一点的机制，局部氢浓度行为，即，在裂纹尖端，进行了评估，通过数值分析和实验测量。虽然热脱附分析可以用来评估金属中的总氢含量，但不能应用于局部地区。使用氢和涂覆元件之间的化学反应的缩微印刷方法不能定量地评估氢含量。本研究考虑到氢致应变，并在一个封闭的区域中的X射线衍射被用来检测在充氢前后的晶格间距的变化。使用应用于小区域的X射线衍射，我们证明氢集中在裂纹附近，即，在弹塑性边界。
We employed X-ray diffraction using collimated X-rays to quantitatively evaluate the local hydrogen concentration behavior in metals. Hydrogen concentrating around a crack tip significantly accelerates crack propagation, i.e., hydrogen embrittlement. In order to clarify the mechanism leading to this, the local hydrogen concentration behavior, i.e., at a crack tip, was evaluated by numerical analysis and experimental measurements. Although thermal desorption analysis can be used to evaluate the total hydrogen content in metals, it cannot be applied to local areas. Microprint methods, which use chemical reactions between hydrogen and coated elements cannot quantitatively evaluate the hydrogen content. The present study takes account of hydrogen-induced strain, and X-ray diffraction in a confined area was employed to detect variations in lattice spacing before and after hydrogen charging. Using X-ray diffraction applied to a small area, we demonstrate that the hydrogen concentrates in the vicinity of the crack, i.e., at the elastic–plastic boundary.