Abstract
Grain boundary of α phase damaged ductility of laser melting-deposited TC18 titanium alloy and grain boundary of α phases were difficult to break by nominal heat treatment. An extra thermal deformation was introduced to break the grain boundary of α phase with the improved mechanical property of TC18 titanium alloy fabricated by laser melting deposition technique. Results indicated that after thermal deformation, β grains in alloy seriously elongated. When sample was deformed at temperatures from 750 to 850 °C, α phase exhibited both rod and irregular morphologies with discontinuous distribution at grain boundary, and the subsequent heat treatment would lead to spheroidization of the α phase. However, after deformation at 900 °C, α phase transferred into β phase and the subsequent heat treatment would make continuous grain boundary of α phase reappear. The suitable hot deformation can effectively break the continuous grain boundary in laser melting-deposited TC18 alloy with respected improved ductility.
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Acknowledgements
This work was supported by National Key Research and Development Program, Ministry of Science and Technology of the People’s Republic of China (No. 2018YFB1106000) and National Natural Science Foundation of China (No. 51801009).
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Li, Xd., Qiu, Cy., Liu, Yt. et al. Effect of thermal deformation on microstructure and properties of TC18 titanium alloy produced by laser additive manufacturing. J. Iron Steel Res. Int. 27, 1476–1484 (2020). https://doi.org/10.1007/s42243-020-00456-3
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DOI: https://doi.org/10.1007/s42243-020-00456-3