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对Ｆｅ－Ｃ合金贝氏体在奥氏体贫碳区形成机制进行了热力学分析．结果表明，贝氏体相变驱动力随奥氏体贫碳区含碳量的降低而增加；在Ｂｓ温度，贝氏体临界相变驱动力（绝对值）为４７０─１２００Ｊ／ｍｏｌ，随合金含碳量的增加而增加；贝氏体铁素体初始含碳量为部分过饱和碳，其过饱和程度随相变温度的降低而增加，且相变驱动力亦相应升高．在整个贝氏体转变温区，初期贝氏体在奥氏体贫碳区马氏体式切变形成具有热力学可能性．
Thermodynamic analysis of the formation mechanism of Fe-C bainite in austenite lean zone was carried out. The results show that the driving force of bainite transformation increases with the decrease of carbon content in the austenite lean zone; at Bs temperature, the critical driving force of bainite (absolute value) is 470─1200 J / mol, Carbon content increases; the initial carbon content of bainitic ferrite is partially supersaturated carbon, the degree of supersaturation increases with the decrease of the phase transition temperature, and the phase change driving force also increases accordingly. In the whole bainite transformation temperature zone, the initial bainite is thermodynamically susceptible to martensitic transformation in austenite lean zone.