Effect of Postweld Heat Treatment on Microstructure, Hardness, and Tensile Properties of Laser-Welded Ti-6Al-4V

The effects of postweld heat treatment (PWHT) on 3.2-mm- and 5.1-mm-thick Ti-6Al-4V butt joints welded using a continuous wave (CW) 4-kW Nd:YAG laser welding machine were investigated in terms of microstructural transformations, welding defects, and hardness, as well as global and local tensile prop...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2012-11, Vol.43 (11), p.4171-4184
Main Authors: Kabir, Abu Syed H., Cao, Xinjin, Gholipour, Javad, Wanjara, Priti, Cuddy, Jonathan, Birur, Anand, Medraj, Mamoun
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Engineering Sciences
Exact sciences and technology
Hardness testing
Heat treating
Joining, thermal cutting: metallurgical aspects
Lasers
Materials Science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanics
Metallic Materials
Metals. Metallurgy
Microstructure
Nanotechnology
Structural Materials
Structural mechanics
Surfaces and Interfaces
Thin Films
Welding
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Summary:The effects of postweld heat treatment (PWHT) on 3.2-mm- and 5.1-mm-thick Ti-6Al-4V butt joints welded using a continuous wave (CW) 4-kW Nd:YAG laser welding machine were investigated in terms of microstructural transformations, welding defects, and hardness, as well as global and local tensile properties. Two postweld heat treatments, i.e., stress-relief annealing (SRA) and solution heat treatment followed by aging (STA), were performed and the weld qualities were compared with the as-welded condition. A digital image correlation technique was used to determine the global tensile behavior for the transverse welding samples. The local tensile properties including yield strength and maximum strain were determined, for the first time, for the laser-welded Ti-6Al-4V. The mechanical properties, including hardness and the global and local tensile properties, were correlated to the microstructure and defects in the as-welded, SRA, and STA conditions.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-012-1230-5