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首页> 外文期刊>ISIJ international >Microstructural and Crystallographic Features of Hydrogen- related Crack Propagation in Low Carbon Martensitic Steel
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Microstructural and Crystallographic Features of Hydrogen- related Crack Propagation in Low Carbon Martensitic Steel

机译：低碳马氏体钢中氢相关裂纹扩展的组织和晶体学特征

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摘要

This study investigated the characteristics of hydrogen-related crack propagation in low carbon lath mar tensite 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 par allel 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 experimen tal 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.
机译：本研究通过电子反向散射衍射的取向分析研究了低碳板条马氏体钢中氢相关裂纹的扩展特征。取向分析表明，与氢有关的断口表面由{011} m晶面组成，这些晶面也与板条马氏体结构中的块边界或板条边界同等。另外，在先前的奥氏体晶界上或附近观察到微裂纹。根据实验结果，我们提出氢增强了局部奥氏体晶界附近的局部塑性变形。与氢有关的断裂机理的特征是，在先前的奥氏体晶界周围形成了微裂纹，随后沿块体边界或板条边界扩展了裂纹。

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