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Journal of Materials Engineering and Performance

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07-04-2022 | Technical Article

Microstructure and Fatigue Properties of Ti-48Al Alloy Fabricated by the Twin-Wire Plasma Arc Additive Manufacturing

Published in: Journal of Materials Engineering and Performance | Issue 10/2022

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Abstract

Due to the inherent temperature brittleness and poor workability, the forming and fabrication of TiAl alloy is extremely difficult. Thus, in recent years, an innovative twin-wire-based plasma arc additive manufacturing (TW-PAAM) technique has been developed to fabricate the Ti-48Al alloy with low cost. In this research, the Ti-48Al alloys are fabricated by the TW-PAAM and the tungsten inert gas welding-based wire and arc additive manufacturing (TIG-WAAM). Afterward, the microstructure, residual stress and fatigue properties are characterized subsequently. The microstructure of the TiAl alloy was found to consist of a dendritic grain region and a fully lamellar colony region. The fully lamellar colonies composed of α₂ and γ phases, and the size of the lamellar colonies tends to increase from the upper to the lower. The residual stress value in the TiAl alloy of lower part is higher than the upper part. Additionally, the mean residual stress value of TW-PAAM TiAl alloy (57.6 MPa) is lower than the TIG-WAAM TiAl alloy(68.4 MPa), decreasing by 15.7%. And the fatigue strength of TiAl alloy in the lower part shows poor fatigue properties compared to the upper part, which is mainly attribute to the effect of residual stress and the size of lamellar colonies.

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Title: Microstructure and Fatigue Properties of Ti-48Al Alloy Fabricated by the Twin-Wire Plasma Arc Additive Manufacturing
Publication date: 07-04-2022
Published in: Journal of Materials Engineering and Performance / Issue 10/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-022-06847-9

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