耦合热力学相变路径预测Fe-C包晶合金宏观偏析
冯苗苗, 张红伟, 邵景霞, 李铁, 雷洪, 王强

Prediction of Macrosegregation of Fe-C Peritectic Alloy Ingot Through Coupling with Thermodynamic Phase Transformation Path
FENG Miaomiao, ZHANG Hongwei, SHAO Jingxia, LI Tie, LEI Hong, WANG Qiang
表1 计算所用合金物性参数
Table1 The alloy physical properties used in the calculation
Parameter descriptionSymbolUnitSn-5%PbFe-0.1%C
Initial concentrationc0%5.00.1
Initial temperatureT0oC2261550
Pure solvent melting temperatureTmoC2321538
Partition coefficientkp-0.0656[5]0.2[8]
Liquidus temperatureTliqoC224.861530.12
Liquidus slopemoC·%-1-1.286[5]-80.579[8]
Eutectic/peritectic temperatureTeoC181.411494.63
Liquid phase concentration at eutectic/peritectic pointce%38.10.53
Solid phase concentration at eutectic/peritectic pointces%2.20.09
Thermal expansion coefficientβToC-16 × 10-5[5]1 × 10-4[8]
Solute expansion coefficientβs%-1-5.3 × 10-3[5]4 × 10-5[8]
Reference concentrationcref%5.00.1
Reference temperatureTrefoC2261550
Ambient temperatureTextoC2525
Liquid densityρkg·m-37000[5]7020[8]
Dynamic viscosityμlPa·s1.0 × 10-3[5]6.2 × 10-3[8]
Latent heat of solidificationLJ·kg-161000[5]270000[8]
Specific heat capacity at constant pressurecpJ·kg-1·K-1260[5]680[8]
Thermal conductivity of alloyλW·m-1·K-155[5]34[8]
Liquid diffusion coefficientDlm2·s-11 × 10-8[5]1 × 10-8[8]
Secondary dendrite arm spacingλ2μm6550
Heat transfer coefficientαW·m-2·K-1300800
Time stepΔts0.010.05