Metallurgical and Mechanical Characterization of Pure Titanium Thick Welds Made Using Laser Narrow Gap Welding Process

Autor: Peng Jiang, Zhang Yi, Liu Jia, Wei Yu, Fuyang Gao
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Engineering and Performance. 30:8859-8871
ISSN: 1544-1024
1059-9495
Popis: In this paper, the microstructure characteristics and microhardness distribution of titanium alloy joints by narrow gap fiber laser welding were studied. High-quality welded joints in 40-mm-thick TA2 have been successfully manufactured using the laser multi-pass narrow gap welding process. The welds were found to be free of lack of fusion defects. The size of grains, microstructure, dislocations, Kernel average misorientation (KAM), texture and microhardness of joint in upper and middle were investigated by optical microscope (OM), transmission electron microscope (TEM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and microhardness Vicker. Results indicate that the upper joint has great different from middle joint on microstructure. In addition, the microhardness of the weld metal center is the highest, and the fusion zone is higher than the base metal and lower than the weld metal. The microhardness of the upper weld metal is higher than that of the middle weld metal. The strength of weld metal is not lower than that of the base metal, and impact toughness KV2 of joint is lower than that of base metal.
Databáze: OpenAIRE
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