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Metals 2017, 7(11), 504; doi:10.3390/met7110504

Laser Welding of BTi-6431S High Temperature Titanium Alloy

1
School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2
Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43221, USA
3
Beijing Hangxing Machinery Manufacture Limited Corporation, Beijing 100013, China
4
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
*
Authors to whom correspondence should be addressed.
Received: 27 September 2017 / Revised: 10 November 2017 / Accepted: 13 November 2017 / Published: 15 November 2017
(This article belongs to the Special Issue Laser Welding)
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Abstract

A new type of high temperature titanium alloy, BTi-6431S, has recently become the focus of attention as a potential material for aircraft engine applications, which could be used up to 700 °C. Pulsed laser welding was used to butt join the BTi-6431S titanium alloy in order to understand the feasibility of using fusion-based welding techniques on this material. The effect of laser energy on the microstructure and mechanical properties of the joints was investigated. The microstructural features of the joints were characterized by means of microscopy and X-ray diffraction. Tensile testing was conducted at both room temperature and high temperature to simulate potential service conditions. The results show that the microstructure of the laser welded joints consists of primary α phase and needle α’ phase, while the microstructure of the heat affected zone consists of α, β, and needle α’ phases. The tensile strength of the welded joints at room temperature was similar to that of the base material, despite a reduction in the maximum elongation was observed. This was related to the unfavorable microstructure in the welded joints. Nonetheless, based on these results, it is suggested that laser welding is a promising joining technique for the new BTi-6431S titanium alloy for aerospace applications. View Full-Text
Keywords: high temperature titanium alloy; laser welding; microstructure; mechanical properties; BTi-6431S high temperature titanium alloy; laser welding; microstructure; mechanical properties; BTi-6431S
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zeng, Z.; Oliveira, J.P.; Bu, X.; Yang, M.; Li, R.; Wang, Z. Laser Welding of BTi-6431S High Temperature Titanium Alloy. Metals 2017, 7, 504.

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