中间退火对5182-O铝合金组织、性能及吕德斯带演变影响  

Effect of intermediate annealing on microstructure,mechanical properties and Luders band evolution of 5182-O aluminum alloy

作　　者：吴万东 孟双 于俊芃 徐志远 王磊 刘兵 麻慧琳 李延成 Wu Wandong;Meng Shuang;Yu Junpeng;Xu Zhiyuan;Wang Lei;Liu Bing;Ma Huilin;Li Yancheng(National Engineering Research Center for Plastic Working of Aluminum Alloys,Shandong Nanshan Aluminum Co.,Ltd.,Yantai Shandong 265700,China;Passenger Car Company,Shanghai Automotive Group Co.,Ltd.,Shanghai 201800,China)

机构地区：[1]山东南山铝业股分有限公司国家铝合金压力加工工程技术研究中心,山东烟台265700 [2]上海汽车集团股份有限公司乘用车公司,上海201800

出　　处：《金属热处理》2024年第12期213-220,共8页Heat Treatment of Metals

基　　金：山东省重点研发项目(2021SFGC1001)。

摘　　要：采用SEM、拓扑仪、万能拉伸试验机等设备,探究中间退火工艺对5182-O铝合金微观组织、成形性、力学性能及吕德斯带演变规律的影响。结果表明,经中间退火处理后,板材的第二相含量减少,晶粒尺寸从19μm增长到34μm,材料强度略微下降(R_(m)=273 MPa,R_(p0.2)=121 MPa)、伸长率小幅提升(A_(50)=27.8%),消除了屈服点延伸率(Yield point elongation,YPE),冲制零件表面吕德斯带显著改善。中间退火工艺能在保证汽车板内覆盖件用5182-O铝合金力学性能、成形性前提下,有效改善吕德斯带。吕德斯带明显改善主要归功于更匹配的晶粒尺寸和更少的大块Al_(6)(FeMn)第二相,减弱了塑性变形时的PLC效应。目前该工艺制备的板材已应用于国内一些主机厂汽车内覆盖件生产。Microstructure,forming property,mechanical properties and Luders band evolution of the 5182-O aluminum alloy materials were characterized by SEM,topometer and universal tensile testing machine.The results show that after intermediate annealing treatment,the content of the second phase in the sheet decreases,the grain size increases from 19μm to 34μm,the material strength slightly decreases(R_(m)=273 MPa,R_(p0.2)=121 MPa),the elongation slightly increases(A_(50)=27.8%),the yield point elongation(YPE)is eliminated,and the Luders band on the surface of the punched parts is significantly improved.The intermediate annealing process can effectively improve the Luders band while ensuring the mechanical properties and formability of the 5182-O aluminum alloy used for automotive panel coverings.The significant improvement in the Luders band is mainly attributed to a more matched grain size and less bulk Al_(6)(FeMn)second phases,which weakens the PLC effect during plastic deformation.At present,the board prepared by this process has been applied to the production of automotive interior panel in some domestic OEMs.

关 键 词：5182-O铝合金 吕德斯带 力学性能 微观组织 PLC效应 

分 类 号：TG146.2[一般工业技术—材料科学与工程]