5.1 引言将奥氏体快速冷却到室温通常会得到很硬的组织——马氏体。原先固溶於奥氏体中的碳原子在新相中仍以固溶态存在,与铁素体和珠光体不同,马氏体是由奥氏体点阵的突然切变形成时,一般并不伴随着原子扩散的过程。马氏体反应最理想时是一种无扩散切变相变,是具有严格的晶体学特征的转变,导致特殊的板条状或透镜状显微组织。钢中马氏体转变是最熟知的合金相变中一大分支。此类合 5.1 Introduction Rapid cooling of austenite to room temperature usually results in a very hard microstructure - martensite. The original solid solution of austenite in the new phase of carbon atoms still exist in solid solution, and ferrite and pearlite is different from the martensite by the austenite lattice sudden shear formation, the general and Not accompanied by atomic diffusion process. The most ideal martensitic reaction is a non-diffusive shear-phase transformation with a rigorous shift in crystallographic characteristics that leads to special lath-like or lenticular microstructures. Martensitic transformation in steel is one of the most well-known alloy phase transitions. Such combination