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本文在较系统地研究了马氏体体积分数(f_M)对B2F和20C,钢铁素体马氏体双相组织机械性能影响规律的基础上,采用扫描电镜拉伸状态下的动态观察、断口形貌与金相组织对应观察,并配合透射电镜分析,对不同马氏体体积分数的双相组织变形行为、裂纹的萌生和扩展及其同金相组织间的对应关系,做了比较细致地直接地试验观察和分析,对其断裂机理提出了看法,并对其宏观机械性能的变异规律给予机理上的解释.
Based on the systematic study of the effect of martensite volume fraction (f_M) on the mechanical properties of B2F and 20C steel martensitic duplex stainless steel, dynamic observation under tension scanning electron microscope (SEM) Appearance and microstructure corresponding observation, and with the transmission electron microscopy analysis of different martensite volume fraction of the two-phase deformation behavior, initiation and propagation of cracks and its correspondence with the microstructure, made a more detailed direct Test observation and analysis, put forward their opinions on the fracture mechanism, and give a mechanistic explanation of the variation law of its macroscopic mechanical properties.