Mechanism of failure by environmentally assisted cracking was extensively investigated in the present work to find the effect of pearlite morphology and crystallographic texture on crack nucleation and propagation sites. The macrotexture analysis revealed that (001) crystallographic texture components parallel to the normal direction was predominant in the investigated sample. Crack nucleated at surface pits and propagated in low angle grain boundaries. The refined microstructure prevents crack growth and can deflect crack propagation. High angle grain boundaries were found to suppress crack propagation. In the crack-free region (223) [10] and (11) [12] texture components were found. Therefore, the control of crystallographic orientation and engineering the grain boundary characteristics can effectively improve the environmentally assisted cracking resistance.

中文翻译：

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珠光体形态和晶体织构对环境辅助开裂失效的影响

在目前的工作中，广泛研究了环境辅助开裂导致的失效机制，以找出珠光体形态和晶体织构对裂纹成核和扩展位置的影响。宏观织构分析表明，平行于法线方向的 (001) 晶体织构成分在所研究的样品中占主导地位。裂纹在表面凹坑处成核并在小角度晶界处扩展。细化的微观结构可防止裂纹扩展并可偏转裂纹扩展。发现大角度晶界可以抑制裂纹扩展。在无裂纹区域（223）[10]和（11）[12]中发现了纹理成分。因此，控制晶体取向和设计晶界特性可以有效提高抗环境辅助开裂性。