镁合金热辊轧制温升效应研究  

Temperature Rise Effect of AZ31B Mg Alloy during Rolling with Heated Rolls

作　　者：丁云鹏 朱强 乐启炽 张志强 崔建忠 Ding Yunpeng Zhu Qiang Le Qichi Zhang Zhiqiang Cui Jianzhong(Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2017年第9期2481-2486,共6页Rare Metal Materials and Engineering

基　　金：国家"973"计划资助项目(2013CB632203);辽宁省自然科学基金资助项目(2014028027);中央高校基本科研业务费专项资金(N120509002;N120309003)

摘　　要：研究了热辊轧制中AZ31B镁合金不同工艺条件下厚度方向温度分布及其与组织的关系,并在此基础上建立了能量守恒的简化方程来预测温升。结果表明:变形过程中各层金属的温升均与压下率正相关,而与初轧温度反相关。辊温显著影响轧制时的表面温降和总体温升,使得热辊轧制表层组织中孪晶明显减小,轧板中再结晶更加充分。此外,基于能量守恒的简化方程的计算结果与实测数据吻合较好。The temperature distribution along the thickness direction of AZ3lB Mg alloy was measured during rolling with heated rolls,based on the previous study of temperature rise effect during rolling with cold（RT） rolls. The effects of different rolling conditions on temperature distribution and its relation with microstructure were investigated. On this basis,simplified energy-based state equations were established to predict temperature rises. The results show that the two temperature rises of metal layers in different thickness both increase with either increased reduction or decreased initial rolling temperature. The roll temperature has obvious effects on surface temperature and overall temperature rise. As a result,the amount of twin in surface layer decreases sharply and the overall recrystallization zone increases during rolling with heated roll,compared with those with cold rolls. The calculated results by energy-based state equations are in good agreement with the experimental ones.

关 键 词：镁合金 变形热 轧制 温升 微观组织 

分 类 号：TG339[金属学及工艺—金属压力加工]