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由 LFG 模型计算贝氏体相变三种可能过程的相变驱动力和 KRC 的结果基本相近,但在高碳合金显示差别.认为对处理间隙固溶体,LFG 模型似略胜一筹.但两个模型所得均以ΔG~(γ→a+Fe_3C)为最大,ΔG~(γ→a+γ_1)次之,ΔG~(γ→a′)最小,ΔG_N~(γ→a′)更远远低于ΔG_N~(γ→a+γ_1)。在 Bs(或 Bs 附近)温度,对 x_γ=0.01—0.02;LFG 的ΔG~(γ→a+γ_1)为-190—-237Jmol~(-1);对 x_γ=0.0235合金,LFG 的ΔG~(γ→a′)和ΔG~(a′→a″+Fe_3C)之和仅-181Jmol~(-1).本文再次表明,按热力学,至少在上部温度,贝氏体不可能以切变机制形成.由形核(长大)驱动力的计算证明,亚共析钢共析反应的领先相为铁素体,而过共析钢的领先相为渗碳体.
The phase change driving force for the three possible processes of bainite transformation calculated by the LFG model is similar to that of the KRC but shows a difference in the high carbon alloys, which seems to be slightly better for the LFG model, but the two models The results show that ΔG ~ (γ → a + Fe_3C) is the largest, ΔG ~ (γ → a + γ_1) is the second, ΔG ~ (γ → a ’) is the smallest, ΔG_N ~ (γ → a’ ΔG_N ~ (γ → a + γ_1). For γ_γ = 0.01-0.02 for Bs (or near Bs); ΔG ~ (γ → a + γ_1) for LFG was -190-237 Jmol -1; for γ_γ = 0.0235 alloy, ΔG for LFG ~ ( the sum of γ → a ’) and ΔG ~ (a’ → a "+ Fe_3C) is only -181 Jmol -1. This paper shows once again that according to thermodynamics, bainite can not be formed by the shear mechanism, at least at the upper temperature The nucleation (growth) driving force calculation proves that the leading phase of the eutectoid steel eutectoid reaction is ferrite, while the leading phase of the eutectoid steel is cementite.