热轧卷取温度对6014铝合金组织和翻边性能的影响  

Effect of hot rolling coiling temperature on microstructure and hemming performance of 6014 aluminum alloy

作　　者：李涛 迟蕊 徐志远 杨立民 麻慧琳 Li Tao;Chi Rui;Xu Zhiyuan;Yang Limin;Ma Huilin(Nanshan Aluminum Flat-Rolled Product Division,Shandong Nanshan Aluminum Co.,Ltd.,Longkou Shandong 265713,China)

机构地区：[1]山东南山铝业股份有限公司南山铝业板带事业部,山东龙口265713

出　　处：《金属热处理》2023年第11期173-179,共7页Heat Treatment of Metals

基　　金：山东省重点研发计划(2021SFGC1001)。

摘　　要：通过改变不同的热轧卷取温度探究其对最终状态6014铝合金组织和翻边性能的影响。利用金相、EBSD、XRD、扫描电镜(SEM)及透射电镜(TEM)等测试手段分析6014铝合金弯曲开裂的原因。结果表明,310℃与360℃热轧卷取温度的最终态6014铝合金试样的晶粒均已再结晶,晶粒长宽比较大,310℃卷取的晶粒尺寸分布不均匀,表层晶粒尺寸大于中心层,易造成应力集中和变形不协调,且其晶界上连续析出尺寸20~40 nm的AlSiCu相。310℃卷取试样的表面凹凸不平程度和滑移带密度大于360℃卷取试样,应变局部化发生的概率较大。360℃卷取试样的晶粒尺寸相对均匀,2.5°~5°的小角度晶界占比更高,晶界较为干净,翻边性能相对较好。310℃卷取的弯曲试样裂纹处存在较多的尺寸粗大的含铁相,其会被滑移带破碎,导致弯曲开裂;360℃卷取试样的裂纹处并未发现粗大的含铁相,但存在少量的韧窝。Effect of hot rolling coiling temperature on the microstructure and hemming property of final state 6014 aluminum alloy was investigated.The causes of bending cracking of the final state 6014 aluminum alloy were analyzed by means of metallography,EBSD,XRD,SEM and TEM.The results show that the grains of the final state 6014 alloy with hot rolling coiling temperatures at 310℃and 360℃have been recrystallized and the ratio of grain length width is large,the grain size distribution of the specimens coiled at 310℃is uneven,the grain size at the surface layer is larger than that at the center layer,which is easy to form stress concentration and deformation disharmony,and AlSiCu phase with the size of 20 nm to 40 nm is continuously precipitated on the grain boundary.The surface roughness and slip band density of the specimen with hot rolling coiling temperature at 310℃are greater than that at 360℃,the probability of strain localization is higher.The grain size coiled at 360℃is relatively uniform.The proportion of 2.5°-5°low angle grain boundary is higher than that coiled at 310℃,the grain boundary is relatively clean,and the hemming performance is relatively good.When coiled at 310℃,there are many iron containing phases with large size in the crack of the bent specimens,which will be broken by the slip band,leading to bending cracking;However,no coarse iron containing phase is found in the crack of the bent specimens coiled at 360℃,besides a few dimples.

关 键 词：6014铝合金 热轧卷取温度 滑移带 翻边 弯曲开裂 

分 类 号：TG146.2[一般工业技术—材料科学与工程]