AZ31镁合金带材热辊轧制温度及变形均匀性  

Temperature and deformation homogeneity of AZ31 magnesium alloy in HRR

作　　者：梅瑞斌[1,2] 包立 张欣 李长生 刘相华[1] MEI Rui-bin;BAO Li;ZHANG Xin;LI Chang-sheng;LIU Xiang-hua(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [2]东北大学秦皇岛分校资源与材料学院,秦皇岛066004

出　　处：《中国有色金属学报》2023年第12期3991-4001,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2021YFB3701302);河北省自然科学基金资助项目(E2018501016)。

摘　　要：利用热-力耦合有限元法分析不同工艺参数对热辊轧制AZ31镁合金常温带材过程温度及变形规律,并开展免道次间退火的多道次热辊轧制带材实验和组织性能测试。结果表明:热辊轧制能够实现轧件温升与轧制变形同步进行。在接触换热和热传导作用下,带材表面与心部温差先增加后减小。入口厚度、辊面温度及压下率增加和轧制速度降低使得带材温升更为显著。带材表面和心部的应变速率差呈周期性上下波动,减小入口厚度和轧制速度有利于变形均匀性调控,辊面温度为300~400℃、轧制速度0.01~0.1 m/s、单道次压下率20%~30%的条件有助于改善温度和变形均匀性。多道次热辊轧后,带材组织内存在小于1μm的超细晶晶粒,平均晶粒尺寸约为2~3μm;带材最大伸长率约为30.7%,抗拉强度达到372 MPa,力学性能较优。The effects of different process parameters on the temperature and deformation pattern during heated roll rolling(HRR) of AZ31 magnesium alloy strip at room temperature were investigated using the thermal-force coupled finite element method.Additionally,experiments and tissue properties tests on strips rolled on multi-pass heated roll without inter-pass annealing were carried out.The results show that the heated roll rolling can achieve the strip temperature rise and rolling deformation in parallel.Under the effect of contact heat transfer and heat conduction,the temperature difference between the surface and the core of the strip first increases and then decreases.The increase in entry thickness,roll surface temperature and reduction rate and the decrease in rolling speed make the strip temperature rise more significant.The strain rate difference between the strip surface and the core fluctuates up and down periodically,reducing the entry thickness and rolling speed is beneficial to the regulation of deformation uniformity.The condition with roll surface temperature of 300-400 ℃,rolling speed of 0.01-0.1 m/s and single pass reduction of 20%-30% is help to improve temperature and deformation uniformity.After multiple pass rolling with heated roll,the strip has superfine grain size of less than 1 μm,with an average grain size of about 2-3 μm.Furthermore,the maximum elongation of the strip is about 30.7% and the tensile strength reaches 372 MPa,which is a good mechanical property.

关 键 词：热辊轧制 AZ31镁合金 有限元 温度 变形均匀性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]