7056铝合金厚板轧制变形不均匀性的实验研究与数值模拟  

Numerical simulation and experimental investigation of rolling deformation inhomogeneity of 7056 aluminum alloy thick plate

作　　者：昌江郁 陈送义 陈康华 周亮[1] 袁丁玲 CHANG Jiangyu;CHEN Songyi;CHEN Kanghua;ZHOU Liang;YUAN Dingling(Light Alloy Research Institute,Central South University,Changsha 410083,China;Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center,Central South University,Changsha 410083,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学有色金属先进结构材料与制造协同创新中心,湖南长沙410083 [3]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2018年第8期1914-1921,共8页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2016YFB0300801);国家重点基础研究发展规划(973计划)项目(2012CB619502);国家自然科学基金重大科研仪器设备研制专项(51327902);国家自然科学基金资助项目(51201186)~~

摘　　要：采用金相显微镜、织构分析、力学拉伸以及DEFORM有限元技术等分析测试方法研究7056铝合金厚度为20 mm板在厚度方向的组织、织构、性能以及轧制变形规律,重点揭示厚度方向1/4处轧制变形与织构和性能的关系。研究结果表明:从厚板表层到芯部再结晶程度逐渐增加;厚板芯部的轧制织构(Brass{011}?211?,S{123}?634?,Copper{112}?111?)体积分数最大,厚板表层的再结晶织构Cube{001}?100?体积分数最小,剪切织构(r-Cube{001}?110?,{112}?110?)主要分布在厚板的表层和1/4层,且在1/4层的体积分数最大;板材强度沿厚度方向呈"W"型分布,在厚度方向1/4处强度最低。其主要原因是轧制过程中厚板1/4层的剪切应力显著比表层与芯部的大,且该层的应变、应变速度和金属流动速度比表层的高,引起轧制变形不均匀。The microstructure,texture,property and deformation law of 7056 aluminum alloy thick plate with a thickness of 20 mm were investigated by optical microscopy,electron back-scattered diffraction(EBSD)technique,tensile tests and DEFORM finite element technology.The relationship among rolling deformation,texture and property was revealed.The results show that the fraction of recrystallization increases from the surface to the center layer,the volume fraction of rolling textures of the center is the highest,such as Brass{011}{211},S{123}{634}and Copper{112}{111},the volume fraction of recrystallization textures of the surface is the lowest,such as Cube{001}{100},and the volume fraction of shear textures of the 1/4 layer is the highest,such as r-Cube{001}{110}and{112}{110}.The distribution shape of strength is“W”along the thickness direction,and the strength of 1/4 layer is the lowest.The main reason is that the shear stress of 1/4 layer is higher than that of the surface and center layer during the rolling process,and the strain,strain rate and metal flow velocity of 1/4 layer have similar changes,which can cause the uneven distribution of rolling of 7056 aluminum alloy thick plate along the thickness direction.

关 键 词：7056铝合金厚板 不均匀性 数值模拟 剪切应力 织构 

分 类 号：TG146[一般工业技术—材料科学与工程]