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根据热力学和动力学的基本理论,建立了低温条件下形变诱导Nb微合金钢中铁素体相变的数学模型,并研究了热变形和化学成分对铁素体体积分数和晶粒尺寸的影响。结果表明,降低变形温度和增加变形程度都能够促进α相变,增加铁素体体积分数,细化铁素体晶粒。而C和Mn含量的增加会抑制α相变过程。最后将模型应用到热轧带钢生产中,其模拟值与实测值吻合较好。
According to the basic theory of thermodynamics and kinetics, the mathematical model of ferrite transformation in Nb microalloyed steel under low temperature was established. The effects of thermal deformation and chemical composition on the volume fraction of ferrite and grain size were also studied. The results show that both reducing the deformation temperature and increasing the degree of deformation can promote α phase transformation, increase the volume fraction of ferrite and refine ferrite grains. The increase of C and Mn content will inhibit the α transformation process. Finally, the model is applied to the hot strip production, the simulated value is in good agreement with the measured value.