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 for shear formation of bainitic ferrite in carbon-depleted regions of austenite is conducted. The driving force of bainitic formation in carbon-depleted region increases with the reduction of carbon concentration in this region and can overcome the energy resistance. The critical driving force (absolute value) at Bs temperature is 470─1200 J/mol. The freshly-formed bainitic ferrite is with partial supersaturation of carbon, which increases with decreasing the reaction temperature. Finally,it is concluded that the shear mechanism of bainitic formation in carbon-depleted region is thermodynamically feasible within the whole temperature range of bainitic reaction.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
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