摘要
测量了30CrNi3MoV低合金高强度钢在不同切削速度下形成的锯齿形切屑中绝热剪切带(ASB)的硬度,使用光学显微镜、SEM、TEM观察了ASB微观组织形貌。结果表明:在剪切变形局部化发生以后,会形成两种形式的ASB,即在低速下形成的以大塑性变形为特征的形变带和高速下形成的以组织细化为特征的转变带。切削速度的增加会影响形变带的硬度,而对转变带硬度影响不大。形变带的硬度是加工硬化的结果,而转变带的硬度来源于相变硬化。
Microstructure observation and microhardness measurement were performed on the adiabatic shear band in the serrated chips of low alloy high-streng steel 30CrNi3 MoV under variant cutting speeds. The results show that, after localization of shear deformation, there were two types of adiabatic shear bands, one was 'deformed band' with elongated microstructure along shear zones at lower cutting speed, the other was 'transformed band' with fine grains at higher cutting speed. The increase in cutting speed only influenced the hardness of the deformed bands, whereas the hardness of the transformed bands was not influenced by cutting speed. The experimental facts proved that the formation of the deformed bands was due to strain-hardening, but the phase transformation hardening process resulted in the very high hardness values in the transformed bands.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第10期16-19,共4页
Materials For Mechanical Engineering
关键词
绝热剪切带
锯齿形切屑
形变带
转变带
adiabatic shear band
serrated chip
deformed band
transformed band
