相变和组织转变是热处理的理论基础。钢和合金经加热、保温、冷却后的组织和结构发生了变化,从而获得人们所期待的性能要求。因此,相变和组织转变的研究一直是金相和热处理工作者所关心的重大课题。但是,人们对相变和组织转变的研究一般比较注重于冷却时的转变,特别是马氏体和贝氏体的转变。对于加热过程中的相变和组织转变则研究不多。因 Phase change and organizational change is the theoretical basis for heat treatment. Steel and alloy after heating, insulation, cooling organization and structure has changed, so as to obtain the desired performance requirements. Therefore, the study of phase transformation and organizational transformation has always been a major issue of concern to metallurgical and heat treatment workers. However, people’s research on phase transformation and organizational transformation generally focus more on the change during cooling, especially the transformation of martensite and bainite. There is not much research on phase transformation and microstructure change during heating. because