板坯连铸过程数值模拟分析

基于传热学基本原理、凝固理论和有限单元法，建立了凝固传热有限差分数学模型，对连铸凝固全过程进行模拟分析，结果表明，拉速越大，铸坯中心及表面温度越高，出结晶器坯壳厚度越薄；过热度增大，铸坯中心及表面温度均上升，出结晶器坯壳厚度减薄；冷却水量相对增大时，铸坯出结晶器坯壳厚度增大，二冷区温度下降较快。连铸坯凝固模型可用来确定常规拉速范围及不同拉速下的凝固壳厚度、凝固末端位置以及铸坯表面温度分布。

Numerical S imulation A nalysis of S lab C ontinuous C asting P rocess

Based on the basic principle of heat transfer and solidification theory and finite element method, the mathematical model of solidification and heat transfer finite difference was established and the simulation analysis the whole process of casting solidification was made. The results showed that casting speed is greater, the slab center and surface temperature is higher, the shell thickness from the mould is thinner;the degree of superheat increases, the temperatures of slab center and surface are all rising, the shell thickness from the mould reduces;and when cooling water increases relatively, the shell thickness from the mould increases, the temperature in secondary cooling zone decreased rapidly. The solidification model for continuous casting slab can be used to confirm the shell thickness, the position of solidification end and temperature distribution in the surface in conventional casting speed range and different casting speed.