Enhanced localized corrosion resistance of Ni-based alloy 625 processed by directed energy deposition additive manufacturing

Hariharan K, Iams AD, Zuback JS, Palmer TA, Sridhar N, Alazemi RM, Frankel GS, Schindelholz EJ (2024)

Publication Type: Journal article

Publication year: 2024

Journal

Corrosion Science Elsevier

Book Volume: 230

Pages Range: 111945

Article Number: 111945

DOI: 10.1016/j.corsci.2024.111945

Abstract

We report a significant improvement in localized corrosion resistance of Ni-based alloy 625 processed by directed energy deposition (DED) in 7.6 mol/L LiCl at 50 °C. Disparities observed in polarization behavior between DED and wrought alloy 625 are analyzed through compositional and microstructural differences. The exceptional localized corrosion resistance of the DED alloy likely stems from the refinement of secondary phases resultant from the DED process. The prototypical precipitates larger than 

1 μm in the wrought material, primarily Nb,Ti-enriched face centered cubic nitrides with the stoichiometry of MN where M = Nb, Ti, Cr, served as pit initiation sites and likely degraded the corrosion resistance.

Authors with CRIS profile

Karthikeyan Hariharan

Involved external institutions

Ohio State University US United States (USA) (US) National Institute of Standards and Technology (NIST) US United States (USA) (US) Pennsylvania State University (Penn State) US United States (USA) (US)

How to cite

APA:

Hariharan, K., Iams, A.D., Zuback, J.S., Palmer, T.A., Sridhar, N., Alazemi, R.M.,... Schindelholz, E.J. (2024). Enhanced localized corrosion resistance of Ni-based alloy 625 processed by directed energy deposition additive manufacturing. Corrosion Science, 230, 111945. https://dx.doi.org/10.1016/j.corsci.2024.111945

MLA:

Hariharan, Karthikeyan, et al. "Enhanced localized corrosion resistance of Ni-based alloy 625 processed by directed energy deposition additive manufacturing." Corrosion Science 230 (2024): 111945.

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