Abstract
Environment-assisted fatigue crack propagation (EAFCP) behavior of as-built and β-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 Ecorr + 0.05 VSCE. As-built DED Ti64 specimen was found to be susceptible to EAFCP in 3.5 pct NaCl solution, and β 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 α and β phases. Since crack bifurcation increases the resistance to fatigue crack propagation (FCP) by reducing effective ∆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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Acknowledgments
This work was supported by the Industrial Technology Innovation Program (20002700) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was also supported by the Industrial Technology Innovation Program (20009993) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
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Oh, H., Kim, J.G., Lee, J. et al. Environment-Assisted Fatigue Crack Propagation (EAFCP) Behavior of Ti64 Alloy Fabricated by Direct Energy Deposition (DED) Process. Metall Mater Trans A 53, 3604–3614 (2022). https://doi.org/10.1007/s11661-022-06765-4
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DOI: https://doi.org/10.1007/s11661-022-06765-4