汽车弯曲件用7xxx系合金的停放稳定性研究  

Study on Parking Stability of 7xxx Series Alloy for Automobile Bending Parts

作　　者：董刘颖 孙强 谢方亮 马龙飞 杨明 邓鑫 Dong Liuying;Sun Qiang;Xie Fangliang;Ma Longfei;Yang Ming;Deng Xin(Liaoning Zhongwang Group Co.,Ltd.,Liaoyang 111003,China)

机构地区：[1]辽宁忠旺集团有限公司,辽宁辽阳111003

出　　处：《有色金属加工》2023年第4期32-35,共4页Nonferrous Metals Processing

摘　　要：对7xxx系铝合金进行挤压后的自然时效和80℃、100℃、120℃、140℃的预时效处理,以及停放120 d后进行双级时效处理,研究不同预时效制度和停放时间对7xxx系铝合金组织、力学和弯曲性能的影响。结果表明,预时效后,仅温度为120℃、140℃所得的强度低于T4态,且120℃和140℃强度相差不大。在后期的弯曲性能测试中,预时效温度为120℃的弯曲回弹角度最小,在停放90 d~120 d周期内的回弹角极差最小。经双级时效处理后,预时效温度120℃且停放120 d的金相组织中析出相数量多且细小均匀,得到的双级人工时效强度最高,屈服强度为310 MPa,抗拉强度为355 MPa。In this paper,7xxx series aluminum alloy is subjected to natural aging after extrusion,pre-aging treatment at 80,100,120 and 140℃,and double-stage aging treatment after 120 days of storage.The effects of different pre-aging systems and storage time on the microstructure,mechanics and bending properties of 7xxx series aluminum alloy are studied.The results show that after pre-aging,the strength obtained at 120℃and 140℃is lower than that in T4 state,and there is little difference between 120℃and 140℃.In the later bending performance test,the bending springback angle with pre-aging temperature of 120℃is the smallest,and the range of springback angle is the smallest in the period of 90~120 days.After two-stage aging treatment,the metallographic structure with pre-aging temperature of 120℃and storage for 120 days has a large number of fine and uniform precipitates.The two-stage artificial aging strength is the highest,with yield strength of 310mpa and tensile strength of 355MPa.

关 键 词：7XXX系铝合金 预时效 弯曲回弹角 双级时效 

分 类 号：TG146.21[一般工业技术—材料科学与工程]