Physics of Fluids - Publications

Enhancing work hardening and ductility in additively manufactured β Ti: roles played by grain orientation morphology and substructure

Journal of Materials Science and Technology 105, 131–141 (2022)

Authors

	A. Zafari
	E.W.C. Lui
	Morgan Li
	Kenong Via

BibTeΧ

@article{ZAFARI2022131,
title = {Enhancing work hardening and ductility in additively manufactured Œ≤ Ti: roles played by grain orientation, morphology and substructure},
journal = {Journal of Materials Science & Technology},
volume = {105},
pages = {131-141},
year = {2022},
issn = {1005-0302},
doi = {https://doi.org/10.1016/j.jmst.2021.08.006},
url = {https://www.sciencedirect.com/science/article/pii/S100503022100760X},
author = {Ahmad Zafari and Edward Wen Chiek Lui and Mogeng Li and Kenong Xia},
keywords = {Œ≤ titanium, Work hardening, Anisotropy, Equiaxed microstructure, Slip band, Laser powder bed fusion},
abstract = {A metastable Œ≤ Ti alloy was additively manufactured by laser powder bed fusion (LPBF). Tensile testing along the build direction of the as-LPBF material (LPBF-0¬∞) revealed significant work softening immediately following yielding with no uniform deformation. By contrast, substantial work hardening and uniform elongation well over 10% were achieved perpendicular to the build direction (LPBF-90¬∞). Similar effects were obtained in the build direction after super transus heat treatment (LPBF-0¬∞+HT) although the strength was slightly lowered. In addition, the yield drop phenomenon observed in both orientations of the as-LPBF materials disappeared after HT. The enhanced work hardening ability, and thus ductility, can be attributed to increased interactions of slip bands/slip bands owing to additional {112}<111> slip systems becoming operative in LPBF-0¬∞+HT and LPBF-90¬∞ while LPBF-0¬∞ was dominated by {110}<111> only. The other variations after HT may be related to the coarsening of grain structure and removal of specific substructures in the as-LPBF microstructure.}
}