通过SEM, TEM, EBSD和纳米硬度等多种手段对经Q&P(quenching and partitioning)工艺处理的低碳 CrNi3Si2MoV钢中的马氏体进行了表征, 并探讨马氏体在单轴拉伸过程中的作用. 研究结果表明: 一次马氏体发生了C配分和回火析出现象, 容易腐蚀;二次马氏体呈淬火态特征, 由1个马氏体领域构成, 板条尺寸较小, 约为0.1-0.2μm,C含量和纳米硬度均高于一次马氏体, 在变形过程中能够协同组织变形,起到强化作用, 而氧化物夹杂和大尺寸的析出物是微裂纹产生和扩展的主要原因.
The martensite in low carbon CrNi3Si2MoV steel treated by Q&P (quenching and partitioning) process was characterized by means of SEM, TEM, EBSD and nano intender. The effect of martensite on uniaxial tension behaviors was discussed. The results showed that initial martensite phase formed at the first quenching step, whose carbon content was lowered due to its carbon diffusion into untransformed austenite during partitioning step. However, the martensite phase formed at the final quenching steconsisted of only one single set of packet with lath thicknes about 0.1—0.2 μm, which was thinner than that of the initial martensie lath. It was found that the carbon content and hardness of the martenite formed in the final quenching step were higher than thoe of initial martensite, which deformed cooperatively with other phases and played a role of strengthening phase during deformation process. In addition, large sized carbonitride and oxide pecipitations induced nucleation and exansion of crack during deformation rocess.
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