近几年马氏体相变研究的进展

综合整理了近年来马氏体相变试验研究的新成果.认为马氏体相变切变过程缺乏热力学可能性.指出马氏体在晶界、相界面、位错等缺陷处形核,并非共格切变过程.发现板条状马氏体、片状马氏体中均存在堆垛层错亚结构；高密度位错、孪晶、堆垛层错亚结构的形成并非切变所致；马氏体形貌的演化系应变能起主导作用,与切变无关；马氏体表面浮凸是相变比...

Research Progress of Martensite Phase Transformation in Recent Years

New achinements in research on martensitic transformation in recent years was summarized. It is considered that shear mechanism of martensitic transformation lacks thermodynamic feasibility. Martensite can nucleate at prior austenitic grain boundaries, phase boundaries and dislocations, rather than a coherent shearing process. Stacking fault substructure is found present in both lath and plate martensite; high-density dislocation, twin crystal, and stacking fault substructure are not caused by shearing process. The evolution of martensitic morphology arises primarily from strain energy, and has nothing to do with shearing process; the surface relief derived from martensitic transformation results from the increase in specific volume during martensitic transformation, and can not regarded as the evidence of shear mechanism; the crypto-crystalline martensite is caused by extremely inhomogeneous composition within prior austenite grains, and takes the shape of irregular lamella