马氏体切变学说的评价

到目前为止，材料学界普遍认为马氏体相变是切变过程，有人则认为切变机制是成熟的理论，其实不然．综合分析了1930年以来提出的所有切变机制，指出各切变机制均与实际不符合的缺点，尚未形成普遍成熟的理论，而是切变学说．将新发现的珠光体浮凸，结合贝氏体、马氏体表面浮凸现象，一并分析了浮凸的形成机制，认为形成表面浮凸的主要原因是各相比体积不同，相变时试样表面不均匀体积膨胀所致．表面浮凸是过冷奥氏体转变产物的普遍现象，因而指出马氏体的切变机制缺乏实验依据．马氏体相变中，原子是极为复杂的集体有组织的位移，不是简单的机械式的切变过程．

Appraise of the doctrine of martensitic shear

It is generally held that martensitic transformation is a shear process which seemed to be mature theoretically,but it's not true.Herein,all the shear mechanisms proposed since 1930s were analyzed.It points out that all the shear mechanisms are not conform with reality.Moreover,the surface relief mechanism was analyzed by combining the surface relief of bainite and martensite with that of the recently found pearlite.It was clearly stated that the martensite phase transformation mechanism is lack of experime...