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对Fe-C-∑X多元合金贝氏体铁素体在奥氏体贫碳区切变相变机制进行了热力学分析,同时测定了贝氏体铁素体形状比及相变阻力。结果表明:贝氏体形状比及相变阻力随合金含碳量的增加及相变温度的降低而增大;在贝氏体相变的上部温度,相变阻力为600—1000J/mol,随含碳量的增加而增加;贝氏体相变驱动力随贫碳区含碳量的减小而增大,并可以克服其相变阻力。因而,贝氏体铁素体在奥氏体贫碳区同成分切变相变可在整个转变温区实现。
Thermodynamic analysis was performed on the shear transformation mechanism of Fe-C-ΣX multiple alloyed bainitic ferrite in lean austenite lean zone. The shape and transformation resistance of bainitic ferrite were also determined. The results show that the bainite shape ratio and phase transformation resistance increase with the increase of the carbon content and the decrease of the transformation temperature. The transformation temperature is 600-1000 J / mol at the upper temperature of bainite transformation. Carbon content increases; bainite phase change driving force increases with the decrease of carbon content in lean carbon area, and can overcome its phase change resistance. Thus, bainitic ferrite in the austenite lean zone with the composition of shear phase transformation can be achieved throughout the transition temperature.