拉伸变形对AA6016铝合金汽车外板再结晶组织及性能的影响

发布时间：2018-06-19 19:45

本文选题：铝合金 + 拉伸变形　；参考：《哈尔滨工业大学学报》2017年05期

【摘要】：为优化冲压成形工艺,研究了不同拉伸形变量对T4P态AA6016冷轧薄板再结晶、析出行为、烘烤硬化性及断裂方式的影响规律.采用与气垫炉生产线类似的新型热处理设备,对合金进行固溶处理,预时效后室温停放,获得T4P态合金.以单向拉伸模拟板材局部冲压成形过程,采用金相显微镜、扫描电镜和透射电镜,对合金再结晶组织、拉伸断口以及位错进行观察,并结合DSC测定和拉伸性能测定,对合金析出行为及力学性能表征.结果表明:随拉伸形变量增加,局部晶粒有被拉长的趋势;形变可抑制GP区溶解,并促进强化相析出;烘烤硬化性随形变增加而减弱;形变较小时,烘烤前后断裂方式均为塑性断裂,而形变较大时,烘烤前合金更加趋向于解理断裂,烘烤后解理断裂趋势减弱.
[Abstract]:In order to optimize stamping process, the effects of different tensile shape variables on recrystallization, precipitation behavior, baking hardening and fracture mode of T4P AA6016 cold rolled sheet were studied. A new type of heat treatment equipment similar to the air cushion furnace production line was used to treat the alloy. After pre-aging the alloy was stopped at room temperature and the T4P state alloy was obtained. The recrystallization microstructure, tensile fracture and dislocation of the alloy were observed by metallographic microscope, scanning electron microscope and transmission electron microscope. The precipitation behavior and mechanical properties of the alloy were characterized. The results show that with the increase of tensile deformation, the local grains tend to be elongated, deformation can inhibit the dissolution of GP region and promote the precipitation of strengthening phase, the baking hardening property decreases with the increase of deformation, and the deformation is small. The fracture mode before and after baking is plastic fracture, but when the deformation is large, the cleavage fracture of alloy tends to be cleavage before baking, and the tendency of cleavage fracture weakens after baking.
【作者单位】：轧制技术及连轧自动化国家重点实验室(东北大学);
【基金】：中央高校基本科研业务费专项资金(N140703002)
【分类号】：TG146.21

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