马氏体变体晶体取向对解理裂纹扩展的作用
The role of crystallographic orientation of martensitic variants on cleavage crack propagation
摘要：
用电子背散射衍射技术研究了低碳板条马氏体钢解理裂纹的扩展。原始奥氏体晶粒内的不同马氏体边界，如子块，块和包边界抵抗解理裂纹扩展的能力已被估计在Kurdjumov-Sachs晶体学变体方面。裂纹路径的晶体学研究表明，块边界是更有效的解理裂纹偏离相比，包边界，而子块边界在这方面是无效的。此外，表征的边界方面的取向差角（角轴对）可能是误导，如果他们的有效性，延缓解理裂纹扩展被认为是。
英文摘要：
Cleavage crack propagation has been investigated in a low-carbon lath-martensitic steel using electron back-scattered diffraction technique. The ability of different martensitic boundaries within prior-austenite grain, such as sub-block, block and packet boundaries to resist cleavage crack propagation has been estimated in terms of Kurdjumov-Sachs crystallographic variants. Crystallographic study of crack path indicated that block boundaries are more effective in cleavage crack deviation as compared to packet boundaries, whilst sub-block boundaries are ineffective in that respect. Moreover, characterizing the boundaries in terms of misorientation angle (angle-axis pair) may be misleading if their effectiveness in retarding cleavage crack propagation is considered.
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