振动电极电渣重熔W9Mo3Cr4V高速钢碳偏析模拟

Numerical simulation of carbon segregation during electroslag remelting of W9Mo3Cr4V high speed steel with vibrating electrode

建立了振动电极电渣重熔W9Mo3Cr4V高速钢二维轴对称非稳态电磁场、流场、温度场和组分传输的多物理场耦合模型,分析了碳的偏析行为和影响规律,利用VOF模型对渣/金界面进行追踪,采用Lever算法调控了非平衡条件下的溶质再分配行为,并考虑了铸锭中不同元素之间的相互影响.结果表明:与传统工艺相比,振动电极电渣重熔工艺可以明显改善碳的偏析,最大正偏析指数由0.135减至0.116,减小了14.07%,最大负偏析指数由-0.124增至-0.105,增大了15.32%;增大w(W)会加重碳的偏析,当w(W)从9%增至9.5%时,最大正偏析指数增大了7.11%,最大负偏析指数减小了10.3%.

A coupling model of two⁃dimensional axisymmetric unsteady electromagnetic field,flow field,temperature field and component transport of electroslag remelting W9Mo3Cr4V high speed steel with vibrating electrode is established.The segregation behaviors and influence rules of carbon are analyzed.The slag/gold interface is tracked by VOF model,and the solute redistribution behavior under non⁃equilibrium conditions is regulated by Lever algorithm.The interaction between different elements in the ingot is also considered.The simulation results show thatcompared with the traditional process,the vibration electrode electroslag remelting process can significantly improve the degree of segregation of carbon,the maximum positive segregation index decreasesby 14.07%from 0.135 to 0.116,the maximum negative segregation index increasesby 15.32%from-0.124 to-0.105,and the increase of w(W)increases the degree of segregation of carbon.When w(W)increases from 9%to 9.5%,the maximum positive segregation increases by 7.11%and the maximum negative segregation increases by 10.3%.