Numerical Simulation of Solute Elements Microsegregation Behavior in the Mushy Zone of Continuous Casting Wide-thick Slab
A coupled macro heat transfer and solute diffusion model was developed to describe micro-segregation behavior of solute elements in the mushy zone during wide-thick slab continuous casting by assuming the transverse cross section of dendrite to be a regular hexagon.The heat transfer model and the micro-segregation model were validated by the industrial tests and the experiment measurements in literatures,respectively.The results show that the cooling rate in the mushy zone decreases from 51.1 oC/s at the surface to 0.13 oC/s at the center of the wide-thick slab of the peritectic steel during continuous casting.The effective cooling rate equaling to 1.78 oC/s mainly depends on mold cooling and varies little with casting speed.The microsegregation behavior of solute elements in the mushy zone depends on back diffusion ability and local equilibrium at interfaces.Compared with other elements in the steel,phosphorus and sulfur elements exhibit a much higher segregation ratio at the end of the solidification and are more significantly affected by the initial carbon content.
peritectic steel wide-thick slab macro heat transfer microsegregation mushy zone
WANG Wei-ling LUO Sen Cai Zhao-zhen Ji Cheng ZHU Miao-yong
School of Materials and Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-6
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）