自然时效对A7N01铝合金光纤激光-变极性TIG复合焊接头组织和性能的影响
Effect of natural aging on microstructure and properties of fiber laser-VPTIG hybrid welding of A7N01 aluminum alloy
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摘要: 对4 mm厚的A7N01铝合金光纤激光-变极性TIG复合焊接头进行自然时效，通过金相显微试验、力学性能测试、差热分析、透射电镜分析等方法研究了自然时效对复合焊接头显微组织、力学性能的影响规律. 结果表明，自然时效30天后，焊接接头力学性能明显提高并达到稳定，接头抗拉强度较焊态时提高了约15%，均值达到369 MPa，为母材的83%，其断后伸长率从焊态3.1%提高到4.4%. 去除余高后，抗拉强度进一步提高到394 MPa，达到母材94%断后伸长率提高到7.6%. 断裂位置均在焊缝处，断口为韧窝状，为典型的韧性断裂. 自然时效后，焊缝显微组织没有发生明显改变，但焊缝中的析出相数量和尺寸比焊态时增多，焊缝中主要析出相主要为GP区及部分亚稳态η′相和η稳定相. 这些析出相能够钉扎位错，提高焊接接头强度.Abstract: The influence of natural aging on joint microstructure and mechanical properties of fiber laser-variable polarity TIG hybrid welding of 4 mm thick A7N01 Aluminum Alloy was investigation by OM, DSC, TEM analysis and mechanical properties test. The experiment results show that the joint mechanical properties was significantly improved and achieved stability after natural aging of 30 days, and the joint average tensile strength was 369 MPa, which is equivalent to 83% of base metal. The tensile strength was increased by about 15% more than that of as-welded joint and the elongation was increased from 3.1% to 4.4%. For the joint of natural aging of 60 days, the tensile strength was increased to 394 MPa by removed the reinforcement, achieve the 94% of that of base metal, and the elongation was achieved to 7.6%. The tensile fracture occurred in the fusion zone, and the fracture morphology was distinctly ductile characteristics. After natural aging, the joint microstructure did not significantly change, but the number and the size of precipitated phase was increased. The precipitation were mainly GP zone and little ofη' orηphase. The precipitated phase can improve the strength of welded joint by pinning dislocations.
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Keywords:
- A7N01 aluminum alloy /
- hybrid welding /
- natural aging /
- microstructure /
- mechanical properties
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