变温马氏体相变细观选择性的初步研究

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Temperature - changed martensitic transformation~ transformation driving force is made up with chemical driving force and mechamical driving force. In this topic, our starting point is microstructure, We hypothesize every crystal grain has inner defect of identi- cal probility and every crystal grain maintains the same transformation, for the crystal grains of equal Gibbis free energy （ refer to the same temperature）, shape changed specific ernegy plays selectivity role in the crystal grainstransformation. On the basis of these, by the finite element analysis method,present conclusion of relationship of shape chang,~d specific energy and temperature of 45# steel.变温马氏体相变的相变驱动力由化学驱动力和力学驱动力组成。本文从细观角度出发，提出在假设每一晶粒存在几率相同的内部缺陷及每个晶粒保持单一种类相的基础上，对于吉布斯自由能相等（即温度相同）的晶粒，形状改变比能对晶粒是否发生相交起着选择性的作用。并以此为基础通过有限元法分析，给出了45#钢临界形状改变比能与温度的关系。