Abstract: This study focuses on the transient electroslag remelting process of 06Cr18Ni11Ti ingots with high filled ratio. By establishing a multiphysics and multiphase coupled model of the ESR process， the influence of melting rate on electromagnetic， heat transfer， fluid flow， and solidification behaviors during the ESR process was investigated. The results indicate that under different melting rates， the current paths are generally consistent， with a obvious skin effect. The temperature inside the crystallizer exhibits a parabolic distribution with significant temperature gradients. As the melting rate increased from 5 kg/min to 7 kg/min， the current density， Lorentz force， and Joule heating increased by 16.2%， 37.7%， and 63.3%， respectively. The maximum temperature of the slag pool increased from 1 902 K to 2 058 K. Both the slag and molten pools exhibit pairs of oppositely directed vortices， with flow becoming more intense with the increasing of melting rate. Under the conditions studied in this paper， increasing the melting rate leads to deepening of the molten pool and prolonging the local solidification time of the ingot. When the melting rate is 5 kg/min， the depth of the molten pool is between 1/2 and 1/3 of the mold diameter and the local solidification time is shortest， which helps to ensure the good density and crystallization quality of the ingot.

Key words: Electroslag Remelting, Melting Rate, High Filled Ratio, 06Cr18Ni11Ti Steel, Solidification Process

摘要： 以06Cr18Ni11Ti钢高填充比电渣重熔铸锭为研究对象，通过建立瞬态电渣重熔过程的多相多物理场耦合模型，探究了熔速对电渣重熔过程中电磁、传热、流动及凝固行为的影响。结果表明，不同熔速下的电流路径基本一致，且存在明显的集肤效应，结晶器内部温度呈抛物线形分布，且温度梯度较大。随着熔速从5 kg/min增至7 kg/min，电流密度、洛伦兹力和焦耳热分别增加了16.2%、37.7%和63.3%；渣池最高温度从1 902 K上升至2 058 K；渣池内存在两对方向相反的涡旋，结晶器内的流动随熔速增大变得更加剧烈；在本文研究条件下，提高熔速会导致熔池深度增大、铸锭局部凝固时间延长；当熔速为5 kg/min时，局部凝固时间最短，熔池深度在结晶器直径的1/2~1/3，有助于保证铸锭良好的致密性和结晶质量。

关键词: 电渣重熔, 熔速, 高填充比, 06Cr18Ni11Ti钢, 凝固过程