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本文采用爆炸快速落刀法获得切屑标本,对40C_rM_o钢退火状态下,不同切削速度的切屑,运用扫描电镜和光学显微镜分析了切屑的第一变形区和二第变形区的组织变化,指出了切削速度为46~(m/min)下,第一变形区的组织已有部分发生回复和再结晶;第二变形区部分组织已发生奧氏体化,随后转变为马氏体,由此可以得出第二变形区同时发生了塑性变形、加工硬化和回复,再结晶,奧氏体化的典型热加工特征。从物理冶金方面来说,是“微区热加工”过程。
In this paper, the rapid decoupled blasting method was used to obtain the swarf samples. For the chips with different cutting speeds under 40C_rM_o steel annealed condition, the microstructures of the first deformation zone and the second deformation zone were analyzed by scanning electron microscope and optical microscope. At a speed of 46 m / min, some of the tissue in the first deformation zone has been partially recovered and recrystallized. Some of the second deformation zone has been austenitized and subsequently transformed to martensite, The second deformation zone occurred at the same time plastic deformation, hardening and recovery, recrystallization, austenitizing typical thermal processing characteristics. In terms of physical metallurgy, it is the “micro-area thermal processing” process.