自然时效对Al-Zn-Mg合金搅拌摩擦焊接头显微硬度与残余应力影响  

Microhardness and residual stress evolution of Al-Zn-Mg alloy friction stir welded joint with aging

作　　者：路浩 韩佩 梁志敏[2] 邢立伟 LU Hao;HAN Pei;LIANG Zhimin;XING Liwei(Xian Shiyou University,College of Materials SciencEand Engineering,Xian 710065,China;Hebei University of Science&Technology College of Materials SciencEand Engineering,Shijiazhuang 050000,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]河北科技大学,石家庄050000

出　　处：《固体火箭技术》2019年第6期808-813,共6页Journal of Solid Rocket Technology

基　　金：十二五国家科技支撑计划高速列车综合节能关键技术与集成应用项目(2013BAG24B02)

摘　　要：搅拌摩擦焊接与弧焊有本质的不同,材料经历的温度循环特征、约束状态与弧焊区别明显,应进一步开展长期服役性能的研究。归纳了搅拌摩擦焊接的特殊性,针对Al-Zn-Mg系T4态铝合金材料,测试分析了焊后随时效残余应力分布、硬度变化特征,测试焊缝及前进、退出侧的极化曲线,发现了搅拌摩擦焊接接头的焊接残余应力回升现象。结合接头硬度、组织特征,实际生产中搅拌摩擦焊接缺欠特征及位置概率,与搅拌摩擦焊接接头电化学测试结果印证,对应力回升引起的应力腐蚀风险等工艺风险性进行了预测。上述工作对认识、规范搅拌摩擦焊接生产,保证焊接质量具有重要的工程价值。The friction stir welding and arc welding are different in nature.Distinctive differences in temperature circulation,constraint state exits between friction stir welding and arc welding.In this paper,the particularity of friction stir welding is summarized,such as thEasymmetry of flow field,residual stress field on the both sides of weld.It is necessary to further study the long-term service performance.For thEal-Zn-Mg aluminum alloy of Heat treatment T4 status,the distribution of residual stress and hardness changes after welding are tested and analyzed.The polarization curves of the welding processes also are tested.The residual stress recovery of the welding joint with aging was found.Combined with joint hardness and organization characteristics,the defect characteristics and position probability of friction stir welding in actual production is predicted.Meanwhile,the electrochemical test results of friction stir welding joint confirm that the stress corrosion risk is caused by stress recovery.ThEabove work has an important engineering merit to understand and standardize the friction welding production and ensure the welding quality.

关 键 词：搅拌摩擦焊 残余应力 应力回升 工艺风险 

分 类 号：V252[一般工业技术—材料科学与工程]