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Effect of Heat Treatment on Microstructure and Properties of Titanium Alloy Welded Joint by Laser Welding with Flux-Cored Wire

1.Harbin Welding Institute Co., Ltd, Harbin 150028, China;2.Shanghai Zhongxun Technology Co., Ltd, Shanghai 200120, China;3.Beijing Jinwei Welding Material Co., Ltd, Tianjin 301906, China;4.Henan International Joint Laboratory of High-Efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;5.School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

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National Key Research and Development Plan of China (2021YFB3401100); Heilongjiang Head Goose Action Plan-Advanced Welding Technology Innovation Team of Energy Equipment (201916120); Open Project of the State Key Laboratory of New Brazing Materials and Technology (SKLABFMT202005)

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    Ti-6Al-4V titanium alloy plate was welded by a laser beam with self-developed titanium alloy flux-cored wire. The welded joint was solution treated at 920 °C for 1 h and aging treated at 650 °C for 2 h, and its microstructure and properties were compared with those of the as-welded joint. The results show that the heat-treated welded joint is composed of a typical tri-modal microstructure containing αp phase, αs phase colony, and αgb phase, as well as punctate distributed residue β phase. α' martensite microstructure in the as-welded joint is not found in the heat-treated joint, which makes the strength, plasticity, and toughness well balanced and maintained. The strength of the heat-treated welded joint is reduced, while elongation and impact toughness at room temperature are enhanced. The tensile fracture of the heat-treated welded joint is surrounded by massive shear lips. The dimples are deep and uniform, presenting as microvoid coalescence ductile fracture. In the as-welded joint, the proportion of large-angle grain boundaries with misorientation between grains in the weld zone greater than 15° accounts for 83.78%, and in the heat-treated welded joint, the proportion is about 90.21%. Through XRD test, it is discovered that the as-welded weld is mainly composed of α' martensite, with a small amount of extremely weak multi-angle α phase diffraction peak. In the heat-treated weld, the central angle position of α phase diffraction peak is consistent with that of α' martensite in the as-welded weld, with a sharp β phase (110) diffraction peak observed as well.

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[Xu Kai, Wang Mingqiu, Fang Naiwen, Wu Pengbo, Huang Ruisheng, Sun Laibo, Li Wei, Wang Xingxing, Zhou Zhenzhen, Li Shuai, Zhang Tianli. Effect of Heat Treatment on Microstructure and Properties of Titanium Alloy Welded Joint by Laser Welding with Flux-Cored Wire[J]. Rare Metal Materials and Engineering,2023,52(8):2665~2675.]
DOI:10.12442/j. issn.1002-185X.20230055

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  • Received:February 04,2023
  • Revised:April 12,2023
  • Adopted:April 20,2023
  • Online: August 25,2023
  • Published: August 24,2023