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Comparative study on fatigue crack propagation behavior of Ti–6Al–4V products made by DED (direct energy deposition) and L-PBF (laser-powder bed fusion) process

Authors :
Junmin Lee
Kwangyeon Kim
Jiwon Choi
Jung Gi Kim
Sangshik Kim
Source :
Journal of Materials Research and Technology, Vol 23, Iss , Pp 4499-4512 (2023)
Publication Year :
2023
Publisher :
Elsevier, 2023.

Abstract

The fatigue crack propagation (FCP) behavior of L-PBF (laser-powder bed fusion) and DED (direct energy deposition) Ti–6Al–4V (Ti64) specimens with different crack directions (CDs) were studied in air and 3.5% NaCl solution under controlled potential, and the results were compared to that of CM (conventional manufacturing) Ti64 specimen. Among the specimens tested, L-PBF Ti64 specimen showed the lowest resistance to FCP, followed by DED and CM Ti64 specimens. The effect of CD with respect to building direction (BD) was negligible on the FCP behavior of L-PBF and DED Ti64 specimens. The micrographic and fractographic analyses suggested that refined microstructure was responsible for the FCP behavior of L-PBF and DED Ti64 specimens. L-PBF and DED Ti64 specimens were susceptible to EAFCP (environment-assisted FCP) in 3.5% NaCl solution, while the sensitivity was not as significant as that of CM counterpart. The sensitivity to EAFCP of L-PBF and DED Ti64 specimens was related to crack bifurcation, rather than intrinsic environmental degradation in Cl− bearing environment.

Details

Language :
English
ISSN :
22387854 and 30412188
Volume :
23
Issue :
4499-4512
Database :
Directory of Open Access Journals
Journal :
Journal of Materials Research and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.f1b940d94e30412188718055bb02901f
Document Type :
article
Full Text :
https://doi.org/10.1016/j.jmrt.2023.02.096