研究了三个Fe-Ni-C合金及三个工业用钢的奥氏作强化对M_s及B_s温度的影响.M_s温度随着奥氏体屈服强度的增加而线性下降,而B_s温度和奥氏体强度之间无任何直接的关系,发现三个Fe-Ni-C合金的B_s温度与D_C~γ和D_(Fe)~γ成正比线性关系,求出这三个合金TTT图上鼻部温度的△G_V及D_(Fe)~γ,则它们的孕育期正比于Feder等的扩散型相变孕育期公式计算值,说明在鼻部温度时,贝氏体孕育期受化学自由能差及Fe原子扩散的控制.
Effect of austenite strengthening on M_s and B_s temperatures in Fe-Ni-C alloys and some commercial steels have been studied. M_s temperature lowers1inearly with the increase of the yield strength of the austenite, while B_s seems tobe independent of the austenite strengthening. By plotting B_s temperature of thethree Fe-Ni-C alloys versus D~γ(C) and D~γ(Fe), a linear relation is obtained. The△G_v and D~γ(Fe) of the alloys were calculated at the nose temperatures in TTT di-agrams, and the incubation periods are found to be directly proportional to thevalues deduced from Feder's equation for diffusional transformations, implying thatthe incubation period at the nose temperature of bainitic transformation is gov-erned by the change in free energy and the diffusion of iron atoms in austenite.
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