研究了粒状贝氏体组织的形变历史、断裂过程与组织内部应力分布关系,结果表明粒状贝氏体组织的主要断裂机制为微孔洞形成、长大和连接,尽管早期的变形历史中就产生了微裂纹,但在随后的形变过程中,由于组织变形微裂纹沿拉伸方向排列,使其不可能成为重要的断裂方式,粒状贝氏体组织在形变过程中应变硬化速率存在一个极小值,在此前后的变形历史和断裂过程中,材料内部的应力分布和微观断裂机制不同。
Relationship among deformation history, fracture process and stress distribu-tion of granular bainite has been investigated. The main process of fracture of granularbainite is forming, growing and coalescence of the microvoids. Even though the microcrackshave formed at the earlier stage of deformation, they are not fateful for fracture because in thesuccessive deformation stage the microcracks change their orientation and parallel to the ten-sile axis. The strain hardening rate of granular bainite has a minimal value during thedeformation process. Before and after the strain of the minimal value, the material showsdifferent stress distribution and microfracture mechanism.
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