不同热处理状态2219铝合金TIG焊接头组织性能分析
Microstructure and property of TIG welded 2219 aluminum alloy by different heat treatment
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摘要: 采用“直流氦弧打底+交流氩弧盖面”的两层TIG自动焊进行了2219CYS与2219C10S的焊接，分析了不同热处理状态焊接接头的组织及成分，进行了接头常温及低温（-196℃）拉伸试验及断裂行为研究.结果表明，2219C10S和2219CYS母材组织均为α（Al）基体上分布着Al2Cu强化相，但母材显微组织形态存在较大差异.焊缝和部分熔化区晶界上分布着条网状α+θ共晶，内部为颗粒状α+θ共晶，固溶到基体中的Cu元素含量分布不均匀.接头断裂起源于CYS侧紧邻打底焊熔合线的部分熔化区，之所以在CYS侧启裂与母材强度、晶粒尺度、晶粒取向及晶界偏析有关.Abstract: Two heat-treated 2219 aluminum alloys were welded by two-pass TIG welding. DC TIG was used for first pass, AC TIG for cover pass. The micro-structure, phase composition and mechanical properties under room and cryogenictemperaturesof welded joint were tested. The results show that the micro-structures of base metals are α(Al) with Al2Cu strengthening phase, while 2219 C10S has a lath-like micro-structure along the rolling direction, 2219 CYS has a coarse irregular polygon micro-structure. α+θ eutectic phases distribute on grain boundary and matrix in weld and partial meltedzone.Solid solution of Cu in the matrix is in-homogeneous. Coarse grain, grain orientation and grain boundary segregation could be the causes of fracture initiation from partial melted zone of 2219CYS.
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Keywords:
- 2219 aluminum alloy /
- heat treatment /
- micro-structure /
- mechanical property
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