Microstructural and Crystallographic Features of Hydrogen-related Crack Propagation in Low Carbon Martensitic Steel
Microstructural and Crystallographic Features of Hydrogen-related Crack Propagation in Low Carbon Martensitic Steel
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DOI：
10.2355/isijinternational.52.208
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发表时间：
2012-02
影响因子：
1.8
通讯作者：
A. Shibata;H. Takahashi;N. Tsuji
中科院分区：
文献类型：
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作者：
A. Shibata;H. Takahashi;N. Tsuji
本研究通过电子背散射衍射取向分析，研究了低碳板条马氏体钢中与氢相关的裂纹扩展特征。取向分析表明，氢相关断裂面由{011}M面组成，其也平行于板条马氏体结构中的块边界或板条边界。此外，在原奥氏体晶界上或附近观察到微裂纹。根据实验结果，我们提出氢增强的局部塑性变形发生在原奥氏体晶界附近。氢相关断裂机制的特点是在原奥氏体晶界周围形成微裂纹，随后裂纹沿块体边界或板条边界扩展。
This study investigated the characteristics of hydrogen-related crack propagation in low carbon lath martensite steel through orientation analysis using electron backscattering diffraction. The orientation analysis revealed that the hydrogen-related fracture surface consisted of the {011}M facets, which were also parallel to the block boundaries or lath boundaries in the lath martensite structure. In addition, micro-cracks were observed on or in the vicinity of the prior austenite grain boundaries. On the basis of the experimental results, we proposed that hydrogen enhanced local plastic deformation occurred in the vicinity of prior austenite grain boundaries. The mechanism of hydrogen-related fracture is characterized by the formation of micro-cracks around prior austenite grain boundaries and subsequent crack propagation along block boundaries or lath boundaries.