5052铝合金板材热轧过程塑性变形及应力分布的三维热力耦合模拟  

Three dimensional thermal mechanical coupled simulation of plastic deformation and stress distribution during hot rolling of 5052 aluminium sheet

作　　者：彭建[1,2] 王永建[1] 钟丽萍[1] 孙勇[1] 彭龙飞[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]国家镁合金材料工程技术研究中心,重庆400044

出　　处：《材料热处理学报》2015年第3期209-213,共5页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划项目(2012BAF09B04);国际科技合作专项项目(2011DFR50950);重庆市政府科技与人才计划(CSTC2013JCYJC6001)

摘　　要：对5052铝合金板材热轧过程进行了三维热力耦合模拟,综合考虑热轧过程中轧制速度、变形温度、道次压下量和摩擦系数等因素对热轧过程中轧件变形区内塑性变形和应力分布的影响,建立了多参数的热力耦合热轧模型。结果表明,在轧件变形区内,因加工硬化与动态软化的综合作用,其流变应力呈典型的动态再结晶特征。在变形区内轧件表面因金属流动剧烈,其等效塑性应变和应变速率远远大于轧件心部,塑性变形显著。轧制速度是轧件温度场分布最重要的影响因素之一,轧制速度越大,轧件的温升就越高;而温度是影响等效应力大小的主要因素,温度升高和应变速率降低都使得流变应力降低。A three dimensional thermal mechanical coupled simulation of 5052 aluminum alloy during hot rolling was described with the multi-parameter thermo-mechanical coupled model. The effects of rolling speed,deformation temperature,pass reduction and friction coefficient on plastic deformation and stress distribution in deformation region were considered generally. The results show that the work hardening and dynamic softening have simultaneity occurred in the deformation region of rolled piece,and the flow stress present few typical characteristics of dynamic recrystallization. The equivalent plastic strain and strain rate in surface part of deformation region are much larger than that in interior,which indicate the flow of metals is violent and plastic deformation has taken place remarkably. The rolling speed is one of the most important parameters that controlled temperature distribution during hot rolling. The deformation temperature has obvious effect on the equivalent stress,and the flow stress decreases with the increasing temperature and decreasing strain rate.

关 键 词：5052铝合金 热轧 热力耦合 塑性变形 应力场 

分 类 号：TG339[金属学及工艺—金属压力加工]