冷变形对T4P态Al-Mg-Si板材在烤漆过程中的时效析出及软化行为的影响  

Effect of cold deformation on aging and softening behavior of Al-Mg-Si aluminum alloy sheet in T4P temper during paint baking treatment

作　　者：刘玉杰 姜旭[1] 刘浩 张耀中 田妮 赵刚 Liu Yujie;Jiang Xu;Liu Hao;Zhang Yaozhong;Tian Ni;Zhao Gang(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110189 [2]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110189

出　　处：《轻金属》2022年第4期44-48,共5页Light Metals

基　　金：国家自然科学基金面上项目(51871043);中央高校基本科研业务费项目(N180212010);辽宁省自然科学基金项目(2019-MS-113)。

摘　　要：针对T4P态汽车车身用Al-1.3Mg-1.2Si-0.5Cu-0.7Mn合金板材,采用室温拉伸变形结合DSC测定分析,研究了冷变形程度对其再经烤漆处理后的屈服强度及时效析出特点的影响规律。结果表明当变形量较大时,T4P态Al-1.3Mg-1.2Si-0.5Cu-0.7Mn合金板材表现出显著的应变强化效应;当应变量超过15%时,由于应变强化导致铝板屈服强度增量接近190 MPa;承受不同程度拉伸变形的T4P态合金板经烤漆处理后,均表现出比较明显的烤漆硬化现象。铝板经烤漆处理前后屈服强度增加量随拉伸变形量的增加先逐渐减小后基本趋于稳定;固溶水淬后30 min内将铝板进行170℃×7 min的预时效处理工艺,能有效改善铝板的烤漆硬化性。The effect of cold deformation on the yield strength and precipitation character of an Al-1.3 Mg-1.2 Si-0.5 Cu-0.7 Mn alloy sheet for automotive body after paint-baking treatment was investigated by tensile test at room temperature and DSC(differential scanning calorimeter) analysis. The results showed that Al-1.3 Mg-1.2 Si-0.5 Cu-0.7 Mn alloy sheet in T4 P temper had significant strain hardening effect when the tensile deformation was large. The yield strength increment of aluminum alloy sheet was close to 190 MPa due to strain hardening when the tensile strain was over 15%;The alloy sheet in T4 P temper subjected to different tensile deformation had obvious paint hardening effect after paint-baking treatment, and the yield strength of alloy sheet before and after paint-baking treatment gradually decreased firstly and then kept approximate constant with the increase of tensile deformation;The paint-baking hardening performance of alloy sheet could be effectively improved by pre-aging treatment at 170 ℃ for 7 min within 30 min after solution and then water quenching.

关 键 词：Al-Mg-Si合金板材 T4P态 拉伸变形 烤漆处理 

分 类 号：TG146.21[一般工业技术—材料科学与工程]