2219铝合金搅拌摩擦焊板硬化方程的建立与液压成形过程分析  

Modeling of hardening equation and analysis of hydroforming process for AA2219 aluminum alloy friction stir welded blank

作　　者：程旺军 刘伟[1] 胡蓝 张志超 徐永超[1] CHENG Wang-jun;LIU Wei;HU Lan;ZHANG Zhi-chao;XU Yong-chao(Institute of High Pressure Fluid Forming,Harbin Institute of Technology,Harbin 150001,China;Shanghai Aerospace Equipments Manufacturer,Shanghai 200245,China)

机构地区：[1]哈尔滨工业大学流体高压成形技术研究所,黑龙江哈尔滨150001 [2]上海航天设备制造总厂,上海200245

出　　处：《塑性工程学报》2020年第10期27-32,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金“航天先进制造技术研究联合基金”重点项目(U1637209);国家重点研发计划项目(2017YFB0306304)。

摘　　要：针对搅拌摩擦焊板焊缝局部力学性能表征、硬化方程建立及整体液压成形工艺模拟的难题,基于数字图像相关(DIC)技术,获得了2219铝合金搅拌摩擦焊缝不同微区的应力-应变曲线,构建了搅拌摩擦焊板焊缝区及母材的硬化方程。通过液压成形模拟与工艺实验对比,验证了该方程的准确性,在此基础上研究了2219铝合金搅拌摩擦焊板曲面件液压成形工艺和焊缝变形行为。结果表明:固溶处理后FSW焊缝变形主要集中在焊核区和热机影响区,与母材相比,最大变形量分别增加了42.0%和19.0%;半椭球拼焊构件的壁厚减薄区面积与焊缝位置有关,带有偏置焊缝的焊接构件因受到较大的拉应力而更容易发生失效,中心焊缝的应力状态更有利于成形。Considering the difficulties in localized mechanical properties characterization of welding of friction stir welded blank,hardening equations establishment and integrated hydroforming process simulations,the stress-strain curves of different micro-zones of welding line of AA2219 aluminum alloy friction stir welding(FSW)were obtained based on digital image correlation(DIC)technology,and the hardening equations of the weld zone(WZ)and base material(BM)of friction stir welded blank were established.The accuracy of equations was verified by comparing the hydraulic bulging simulation with the process experiments.On this basis,the hydroforming process and welding line deformation behavior of the AA2219 aluminum alloy FSW curved surface blanks were investigated.The result shows that the FSW welding line deformation after solution treatment is mainly located in the weld nugget zone(WNZ)and thermo-mechanical affected zone(TMAZ).Compared with BM,the maximum deformation amount is increased by 42.0%and 19.0%,respectively.The area of thickness thinning zone of semi-ellipsoidal welded component is related to the location of welding line.The welded component with the offsetting welding line is prone to fracture due to large tensile stress,and the stress state of the central welding line is more conductive to forming.

关 键 词：2219铝合金 搅拌摩擦焊板 硬化方程 液压成形 

分 类 号：TG407[金属学及工艺—焊接]