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Metals and Materials International
Published in: Metals and Materials International 9/2021

27-03-2020

Comparative Study on Microstructure and Aluminum Distribution Between Laser Beam Welding and Electron Beam Welding of Ti–6Al–4V Alloy Plates

Authors: Hengchang Bu, Qiyu Gao, Yun Li, Feiyun Wang, Xiaohong Zhan

Published in: Metals and Materials International | Issue 9/2021

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Abstract

Ti–6Al–4V alloy plates with a thickness of 4 mm were joined by electron beam welding (EBW) and laser beam welding (LBW). The comparison of LBW and EBW was performed according to grain morphology, microstructure, aluminum distribution, and microhardness of the joints. Results indicate that compared with LBW joint, more equiaxed grains are observed around the central zone of the EBW joint. The microstructure in fusion zone (FZ) of EBW joint presents more uneven with obviously coarser acicular martensite α′. Moreover, the aluminum element content of EBW joint is substantially lower, which demonstrates a more significant burning loss behavior in EBW process. The lower aluminum content in the upper center areas of the joints is attributed to the more significant element burning loss caused by higher temperature, whereas more uniform aluminum distribution in the upper part of the joints is ascribed to stronger convection form within the upper part of the joint. In addition, the characteristics of convection and thermal field within the molten pool are recognized as vital factors influencing the aluminum distribution. The lower microhardness profile in FZ of the EBW joint is principally attributed to coarser acicular martensite α′ and lower aluminum element in EBW joint.

Graphic Abstract

previous article Fatigue Properties of Resistance Spot Welded Dissimilar Interstitial-Free and High Strength Micro-Alloyed Steel Sheets
next article Determination of Ideal Conditions for GTD-111 Superalloy Welding Through Pre-Heating, Pre-Cold and Heat Treatment

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Metadata
Title
Comparative Study on Microstructure and Aluminum Distribution Between Laser Beam Welding and Electron Beam Welding of Ti–6Al–4V Alloy Plates
Authors
Hengchang Bu
Qiyu Gao
Yun Li
Feiyun Wang
Xiaohong Zhan
Publication date
27-03-2020
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 9/2021
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-020-00683-z

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