高强韧铝合金半连铸铸锭温度场与应力场数值模拟  

Numerical Simulation of Temperature Field and Stress Field of High Strength Aluminum Alloys in Direct-chill Casting Ingot

作　　者：罗海军[1] 介万奇[1] 高志明[1] 郑永健[1] 刘永勤[1] 宋文涛[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《铸造技术》2014年第11期2455-2460,共6页Foundry Technology

基　　金：国家重点基础研究发展计划资助项目(2011CB610403)

摘　　要：基于有限差分软件MAGMAsoft的Continuous casting模块,建立了准800 mm×2 000 mm高强韧铝合金半连铸圆锭热-力耦合的有限差分模型。分别对不同结晶器高度、引锭底盘形状,以及不同铸造速度下的温度场、应力场进行了模拟计算。综合分析了工艺条件的改变对铸锭温度场和应力场的影响规律。结果表明:结晶器高度为200 mm时,液穴深度和铸锭温度梯度较小,裂纹倾向减少;引锭盘形状为圆柱形凸底盘时,有利于降低裂纹倾向;提高铸造速度,使液穴变深,温度梯度增加,裂纹倾向增大。An thermo-mechanical finite difference model based on MAGMAsoft, was established for the calculation of thermal field and stress field of Ф800 mm ×2 000 mm direct-chill casting round ingot. The effect of the chill size, start block shape and casting speeds on the temperature field and the stress field were analyzed. The results show that the depth of sump, as well as the ingot temperature gradient is lower, and the cracking tendency decreases as the chill height is 200 mm. The convex shape of the start block is beneficial to decreasing the crack. Meanwhile, the increasing casting speeds result in the deeper sump, the larger temperature gradient and the intensified crack.

关 键 词：高强韧铝合金 MAGMA软件 半连续铸造 圆铸锭 数值模拟 

分 类 号：TG292[金属学及工艺—铸造]