连铸大方坯自然热收缩行为的有限元模拟分析

Finite element modeling analysis of nature thermal shrinkage for continuous casting bloom

结合国内某钢厂360 mm×450 mm大方坯连铸的实际生产工艺,利用商用有限元软件MSC.MARC对连铸大方坯自然热收缩行为进行三维热力耦合模拟。本次有限元模拟采用热弹塑性模型,研究不同拉速下铸坯温度场与凝固收缩规律。研究结果表明:拉速越高,温度变化越慢,铸坯总收缩量越小;拉速越小,温度变化越快,铸坯总收缩量越大;铸坯在宽度方向和厚度方向表现出不同规律的自然热收缩行为。

Based on the practical production condition of continuous casting bloom of 360 mm × 450 mm made in a domestic steel plant,a 3D thermo-mechanical coupling model was applied to simulate the nature shrinkage of continuous casting bloom by using the finite element software MSC.MARC.Using thermal elastoplastic model,the temperature distribution and solidification shrinkage behavior of bloom under different casting speed was investigated.The results show that the more the casting speed changes,the smaller the temperature and the total thermal shrinkage;On the contrary,the smaller the casting speed changes,the more the temperature and the total thermal shrinkage;the free thermal contraction along the strands has different behaviors in width direction and thickness direction.