Fe-Bi-Mn三元合金多相相变-扩散体系中易切削相析出规律的数值研究

王哲, 王发展, 何银花, 王欣, 马姗, 王辉绵

NUMERICAL STUDY ON FREE-CUTTING PHASE PRECIPITATION BEHAVIOR IN Fe-Bi-Mn TERNARY ALLOY MULTIPHASE TRANSFORMATION- DIFFUSION SYSTEM

WANG Zhe, WANG Fazhan, HE Yinhua, WANG Xin, MA Shan, WANG Huimian

表2 模拟中采用的物性参数

Table 2 Physical parameters used in simulation

Parameter Fe MnS Bi Atomic fraction / % 55.8 87.0 209.0 Melting point / K 1808 1630 544 Density / (kg·m-3) 7850 3990 9780 Specific heat / (J·kg-1·K-1) 460 303 130 Viscosity / (kg·m-1·s-1) 0.0059 0.0073 0.0021 Heat conductivity / (W·m-1·K-1) 80.4 34.0 7.9 Latent heat / (J·kg-1) 246400 148390 11300 Liquidus slope / K -55.0 -4.8 -2.7 Partition coefficient 0.36 0.84 0.25 Solid diffusion coefficient / (m2·s-1) 1.0×10-9 1.2×10-13 2.2×10-9 Liquid diffusion coefficient / (m2·s-1) 2.0×10-8 4.0×10-9 1.6×10-8 Gas diffusion coefficient / (m2·s-1) - - 5.7×10-7 Thermal expansion coefficient / K-1 1.43×10-4 1.07×10-4 2.83×10-4 Solutal expansion coefficient / (%-1) 1.1×10-2 0.2×10-2 1.9×10-2 Initial temperature / K 1873 1873 1873 External temperature / K 298 298 298