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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Fe-C合金贝氏体相变热力学(LFG模型)
, PP. 33-41
Abstract:
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.
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