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Environment-Assisted Fatigue Crack Propagation (EAFCP) Behavior of Ti64 Alloy Fabricated by Direct Energy Deposition (DED) Process

Authors
Oh, HojunKim, Jung GiLee, JunminKim, Sangshik
Issue Date
Oct-2022
Publisher
ASM International
Citation
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v.53, no.10, pp 3604 - 3614
Pages
11
Indexed
SCIE
SCOPUS
Journal Title
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume
53
Number
10
Start Page
3604
End Page
3614
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/854
DOI
10.1007/s11661-022-06765-4
ISSN
1073-5623
1543-1940
Abstract
Environment-assisted fatigue crack propagation (EAFCP) behavior of as-built and beta-annealed Ti64 specimens manufactured by direct energy deposition (DED) process was examined in air and 3.5 pct NaCl solution under an anodic applied potential of E-corr + 0.05 V-SCE. As-built DED Ti64 specimen was found to be susceptible to EAFCP in 3.5 pct NaCl solution, and beta anneal did not decrease the sensitivity to EAFCP. It was suggested that Cl- bearing environment tended to decrease the tendency for crack bifurcation during EAFCP of DED Ti64 specimen, because of local corrosion damage at boundaries between alpha and beta phases. Since crack bifurcation increases the resistance to fatigue crack propagation (FCP) by reducing effective increment K (stress intensity factor range) at the tip of crack, the FCP rates of DED Ti64 specimen increased in 3.5 pct NaCl solution.
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Kim, Jung Gi
대학원 (나노신소재융합공학과)
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