Laser & Optoelectronics Progress, Volume. 56, Issue 10, 101404(2019)
Microstructures and Properties of Laser Welded Ti2AlNb-Based Alloy Joints Under Different Heat Treatment States
The microstructures and mechanical properties of laser welded Ti-22Al-27Nb alloy sheet joints are investigated under hot rolling, heat treatment of 1080 ℃/40 min/water-cooling (HT1), and heat treatment of 980 ℃/3 h/oil-cooling (HT2). The well-formed welds are obtained with the process parameters of laser power of 1500 W and welding speed of 1 m/min. The microstructures of hot rolled, HT1 and HT2 sheet joints are B2+O+α2 phase, B2 phase, and B2+O+α2 phase, respectively. From the fusion line to the base metal, the microstructures of heat affected zones for hot rolled and HT2 sheet joints are the B2, B2+α2, and B2+O+α2 phase zones, respectively, however, those of HT1 sheet joints are only single B2 phase. The tensile strengths of hot rolled sheet joints at room temperature and 650 ℃ are 1023 MPa and 675 MPa, and the elongations are 5.48% and 2.56%, respectively. In contrast, the tensile strength of HT2 sheet joints are 860 MPa and 680 MPa, and the elongations are 7.04% and 4.97%, respectively.
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Bo Liu, Zhenglong Lei, Heng Zhou, Honghui Wang. Microstructures and Properties of Laser Welded Ti2AlNb-Based Alloy Joints Under Different Heat Treatment States[J]. Laser & Optoelectronics Progress, 2019, 56(10): 101404
Category: Lasers and Laser Optics
Received: Oct. 31, 2018
Accepted: Dec. 21, 2018
Published Online: Jul. 4, 2019
The Author Email: Lei Zhenglong (leizhenglong@hit.edu.cn)