Microstructure, Thermal Behavior and Tensile Properties of Laser Welded Bottom-Locking Joint for TA15 Titanium Alloy

Jiayao Wang; Jianfeng Wang; Yanqiu Zhao; Yue Li; Xiaohong Zhan

doi:10.1007/s12540-022-01311-8

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자료유형: 학술저널

저자정보: Jiayao Wang (Nanjing University of Aeronautics and Astronautics) Jianfeng Wang (Nanjing University of Aeronautics and Astronautics) Yanqiu Zhao (Nanjing University of Aeronautics and Astronautics) Yue Li (Nanjing University of Aeronautics and Astronautics) Xiaohong Zhan (Nanjing University of Aeronautics and Astronautics)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.5

발행연도: 2023.5

수록면: 1,441 - 1,453 (13page)

DOI: 10.1007/s12540-022-01311-8

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The present investigation aims at the thermal conditions for the TA15 titanium alloy laser welded bottom-locking joint.Bottom-locking featured specimens under three welding speeds were manufactured to study the grain morphology and tensileproperties. Finite element computation based on temperature field simulation was conducted in order to shed more light on themicrostructure characteristics of the bottom-locking joint. The results indicate a significant influence of the welding speed onthe thermal cycle, microstructure evolution and tensile performance. As the welding speed increases, the width of weld zone(WZ) is decreased significantly. At the same time, the columnar crystal features a coarser shape and its growth cross regionat the bottom of WZ becomes smaller with the increasing welding speed. Besides, the size of martensite decreases with theincreasing of welding speed. With the support of both numerical and experimental results, complex microstructure evolutionmechanisms were revealed involving thermal cycle related to the welding speed. In addition, the laser welded bottom-lockingjoint of TA15 titanium alloy is even fractured at the base metal, which exhibits the comparable tensile properties. The EDSresults illustrate the inevitable burning losses of stabilization element during the welding process. All these mechanisms areassociated with the bottom-locking joint arrangement and the welding speed-induced thermal cycle.

#TA15 titanium alloy · Laser bottom-locking welding · Welding speed · Microstructure · Tensile strength

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