焊接方法对2219板材组织和力学性能的影响
|
摘要
分别采用搅拌摩擦焊(FSW)和钨极氩弧焊(TIG)对2219铝合金大型锻环上切取的板材进行焊接,通过维氏硬度和拉伸试验对焊接接头的室温力学性能进行了测试,并采用金相显微镜和扫描电镜等手段对接头的显微组织进行了观察。结果表明,两种焊接方法都使2219铝合金的硬度、强度和塑性下降,FSW焊接接头的硬度、强度明显高于TIG焊接接头,但是塑性相当。这是由于FSW焊缝处的组织相对于TIG焊更加细小,而且分布有一定数量的析出相。FSW和TIG焊接接头的断裂模式为韧性和脆性混合断裂。FSW和TIG焊接接头断裂位置分别为热机影响区和熔合区。
The 2219 plates cut from a large foring ring were welded by FSW and TIG method. The hardness and tensile properties of the welded joint were tested at room temperature by hardness and tensile tests, and the microstructure of the welded joint was observed by optical microscope and SEM. The results show that the hardness, strength and ductility of 2219 aluminium alloy decrease after welding. The hardness and strength of FSW welded joint are higher than that of TIG welded joint, but the ductility is comparative. The reason is that the microstrcuture of FSW welded joint is finer than that of TIG welded joint and a number of precipitated phases are distributed in the microstructure of FSW welded joint. The fracture mode of FSW and TIG welded joints is mixed fracture of ductile and brittle fracture. The fracture locations of FSW and TIG welded joints are termo-mechanically affected zone(TMAZ) and fusion zone, respectively.
The 2219 plates cut from a large foring ring were welded by FSW and TIG method. The hardness and tensile properties of the welded joint were tested at room temperature by hardness and tensile tests, and the microstructure of the welded joint was observed by optical microscope and SEM. The results show that the hardness, strength and ductility of 2219 aluminium alloy decrease after welding. The hardness and strength of FSW welded joint are higher than that of TIG welded joint, but the ductility is comparative. The reason is that the microstrcuture of FSW welded joint is finer than that of TIG welded joint and a number of precipitated phases are distributed in the microstructure of FSW welded joint. The fracture mode of FSW and TIG welded joints is mixed fracture of ductile and brittle fracture. The fracture locations of FSW and TIG welded joints are termo-mechanically affected zone(TMAZ) and fusion zone, respectively.
引文
[1] Wang G Q, Li Q, Li Y J, et al. Effects of weld reinforcement on tensile behavior and mechanical properties of2219-T87 aluminum alloy TIG welded joints[J]. Transactions of Nonferrous Metals Society of China, 2017, 27(1):10-16.
[2] Du B, Cui L, Yang X Q, et al. Weakening mechanism and tensile fracture behavior of AA 2219-T87 friction plug welds[J].Materials Science and Engineering A, 2017, 693:129-135.
[3] Liu C C, He J S. Numerical analysis of fluid transport phenomena and spiking defect formation during vacuum electron beam welding of 2219 aluminium alloy plate[J].Vacuum, 2016, 132:70-81.
[4] Noor Z K, Arshad N S, Zahid A K, et al. Mechanical and microstructural behavior of friction stir welded similar and dissimilar sheets of AA2219 and AA7475 aluminium alloys[J].Journal of Alloys and Compounds, 2017, 695:2902-2908.
[5]史耀武,唐伟.搅拌摩擦焊的原理与应用[J].电焊机, 2000,30(1):6-9.
[6]彭杏娜,曲文卿,张国华.焊接方法对2219铝合金性能及组织的影响[J].航空材料学报,2009,29(2):57-60.
[7]宋民远,赵海云,曲文卿,等. 2219铝合金及变极性TIG焊焊接接头的力学性能[J].铝加工,2010(3):30-34.
[2] Du B, Cui L, Yang X Q, et al. Weakening mechanism and tensile fracture behavior of AA 2219-T87 friction plug welds[J].Materials Science and Engineering A, 2017, 693:129-135.
[3] Liu C C, He J S. Numerical analysis of fluid transport phenomena and spiking defect formation during vacuum electron beam welding of 2219 aluminium alloy plate[J].Vacuum, 2016, 132:70-81.
[4] Noor Z K, Arshad N S, Zahid A K, et al. Mechanical and microstructural behavior of friction stir welded similar and dissimilar sheets of AA2219 and AA7475 aluminium alloys[J].Journal of Alloys and Compounds, 2017, 695:2902-2908.
[5]史耀武,唐伟.搅拌摩擦焊的原理与应用[J].电焊机, 2000,30(1):6-9.
[6]彭杏娜,曲文卿,张国华.焊接方法对2219铝合金性能及组织的影响[J].航空材料学报,2009,29(2):57-60.
[7]宋民远,赵海云,曲文卿,等. 2219铝合金及变极性TIG焊焊接接头的力学性能[J].铝加工,2010(3):30-34.