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Effect of Postweld Heat Treatment on Microstructure, Hardness, and Tensile Properties of Laser-Welded Ti-6Al-4V |
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| Authors: | Abu Syed H. Kabir Xinjin Cao Javad Gholipour Priti Wanjara Jonathan Cuddy Anand Birur Mamoun Medraj |
| Affiliation: | 1. Concordia University, Montr??al, Qu??bec, H3G 1M8, Canada 2. McGill University, Montr??al, Qu??bec, H3A 0C5, Canada 3. Aerospace Manufacturing Technology Center, Institute of Aerospace Research, National Research Council Canada, Montr??al, Qu??bec, H3T 2B2, Canada 4. StandardAero Limited, Winnipeg, Manitoba, R3H 1A1, Canada 5. Department of Mechanical and Industrial Engineering, Concordia University, Montr??al, Qu??bec, Canada |
| Abstract: | 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. |
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