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以45钢为研究对象,建立了多元凝固体系溶质平衡分配系数的热力学计算模型,利用FactSage Equilib模块计算得到了45钢凝固相变过程以及各溶质分配系数的变化。结果表明:45钢凝固路径先后经过L-δ、L-γ固-液两相区,MnS在固相中析出;依据相区间和温度的变化,回归得到了45钢中溶质C、Si、Mn、P、S平衡分配系数变化公式;溶质C、Si、Mn、P、S平均平衡分配系数分别为0.307、0.737、0.695、0.18、0.021,其中S偏析趋势最强烈,P次之,C偏析趋势较P小,Si和Mn基本相当,偏析较小。
Taking 45 steel as the research object, the thermodynamic calculation model of the equilibrium partition coefficient of solute in multivariate solidification system was established. The solidification phase transformation of 45 steel and the change of each solute partition coefficient were calculated by FactSage Equilib module. The results show that the solidification path of 45 steel passes through the L-δ, L-γ solid-liquid two-phase zone and the MnS precipitates in the solid phase. Based on the phase and temperature changes, the solute C, Si and Mn , P and S, and the equilibrium distribution coefficients of C, Si, Mn, P and S were 0.307, 0.737, 0.695, 0.18 and 0.021, respectively, of which S segregation tendency was the strongest, P times and C segregation trend Smaller than P, Si and Mn are basically the same, segregation smaller.