贝氏体轨道钢连铸凝固过程中溶质微观偏析模型及分析

高新亮, 巴文月, 张正, 席仕平, 徐东, 杨志南, 张福成

Model and Analysis of Solute Microsegregation in Bainite Rail Steel During Continuous Casting Process

GAO Xinliang, BA Wenyue, ZHANG Zheng, XI Shiping, XU Dong, YANG Zhinan, ZHANG Fucheng

表1 元素的平衡分配系数、扩散系数和液相线斜率^[26]

Table 1 Equilibrium partition coefficients, diffusion coefficients, and slopes of liquidus of elements^[26]

Element	$k_{i}^{δ / L}$	$D_{S, i}^{δ} /$ (10^-4 m²·s^-1)	$k_{i}^{γ / L}$	$D_{S, i}^{γ} /$ (10^-4 m²·s^-1)	m_i / (^oC·%^-1)
C	0.19	0.0127exp(-81382.6 / (RT))	0.34	0.076exp(-134563.8 / (RT))	78.0
Si	0.77	8.0exp(-248959.7 / (RT))	0.52	0.3exp(-251470.3 / (RT))	7.6
Mn	0.76	0.76exp(-224440.3 / (RT))	0.78	0.055exp(-249378.2 / (RT))	4.9
P	0.23	2.9exp(-230130.9 / (RT))	0.13	0.001exp(-182849.4 / (RT))	34.4
S	0.05	4.56exp(-214649.3 / (RT))	0.04	2.4exp(-223516.8 / (RT))	38.0
Cr	0.95	2.4exp(-239796.3 / (RT))	0.86	0.0012exp(-219000.9 / (RT))	1.0
Ni	0.83	1.6exp(-240005.6 / (RT))	0.95	0.34exp(-282391.5 / (RT))	4.7
Mo	0.80	3.47exp(-241386.3 / (RT))	0.59	0.068exp(-246867.6 / (RT))	2.6