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根据马氏体相变的经典形核理论 ,重新估算了铁基合金中马氏体均匀形核激活能 ,研究了激活能与界面能和相变驱动力的关系。结果表明 ,热激活形核具有很低的形核激活能 ;热激活能形核动力学与马氏体形核动力学实验研究结果一致。在动力学研究的基础上 ,提出了马氏体相变的形核机制。在该形核机制中 ,除了热激活形核 ,还考虑了应力对马氏体形核的作用 ,特别是在低温时由于急冷导致的内应力对形核的贡献。
According to the classical nucleation theory of martensitic transformation, the uniform nucleation activation energy of martensite in iron-based alloy was re-evaluated, and the relationship between activation energy and driving force of interfacial energy and transformation was studied. The results show that the heat-activated nucleation has a very low nucleation activation energy. The nucleation kinetics of heat activation is consistent with the experimental results of martensitic nucleation kinetics. Based on the kinetic study, the nucleation mechanism of martensitic transformation was proposed. In this nucleation mechanism, in addition to heat-activated nucleation, the effect of stress on martensite nucleation is also taken into account, especially the contribution of internal stress due to quenching at low temperatures to nucleation.