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采用类似小角度晶界比界面能的理论计算方法对半共格的奥氏体铁素体相界面比界面能和铁素体核坯形状系数进行了计算;并推导了核坯形状为旋转椭球、盒形和圆片时晶界面上形核的临界形核体积、临界形核功和孕育期的计算模型。通过模型对比分析以及与孕育期试验数据的比较,结果表明铁素体等温相变将优先以表面弯曲的旋转椭球核坯形核。计算结果进一步发展了经典形核理论,也提供了适用的铁素体等温相变孕育期计算的理论模型。
The interfacial interfacial energy of interfacial austenite ferrite phase and the shape coefficient of ferrite nucleus blank were calculated by the theoretical calculation method similar to the interface energy of small angle grain boundary. The critical nucleation volume, the critical nucleation energy and the incubation period calculation model of nucleation at the interface of sphere, box and wafer. The results of comparative analysis and comparison with the experimental data show that the isothermal transformation of ferrite will preferentially nucleate the spheroidoid nuclei with curved surface. The results of the further development of the classical nucleation theory, but also provides a suitable ferritic isothermal phase transition period calculation of the theoretical model.