Abstract
The cooling time of cryogenic vaporised Ar shielding/cooling of Ti-6Al-4 V deposits was ~ 10 times faster than that of normal Ar gas shielding/cooling. The columnar β grains in rapid cooling condition were observed to be in the longitudinal direction of the deposits same as that in natural cooling condition. Under the rapid cooling, a narrow heat-affected zone band (~ 70 μm) and a wide vanadium-segregation band was observed, along with a reduced aspect ratio of the α plate, which led to improved isotropic-tensile properties along the deposition and building directions. Rapid cooling condition also retained a significant amount of O and N, which enhanced its hardness and tensile strength. Thus, cryogenic vaporised Ar shielding/cooling can produce Ti-6Al-4 V wire-arc additive manufacturing deposits with better tensile properties compared to normal Ar gas shielding.
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Acknowledgements
This work was supported in part by the Ministry of Science, ICT, and Future Planning of Korea through the National Research Foundation of Korea (NRF) Future Material Discovery Project (NRF-2016M3D1A1023534) and by the Ministry of Trade, Industry and Energy (MOTIE, Korea) through the Technology Innovation Program (20004932).
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**an, G., Cheepu, M., Yu, J. et al. Enhancing Tensile Properties of Wire-Arc Additively Manufactured Ti-6Al-4 V Deposits Via Cryogenic Vaporised Ar Shielding/Cooling. Met. Mater. Int. 29, 501–514 (2023). https://doi.org/10.1007/s12540-022-01272-y
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DOI: https://doi.org/10.1007/s12540-022-01272-y