Sensitization of 316L Stainless Steel made by Laser Powder Bed Fusion Additive Manufacturing

Snitzer, John; Lou, Xiaoyuan

doi:10.5006/4241

Title: Sensitization of 316L Stainless Steel made by Laser Powder Bed Fusion Additive Manufacturing

Journal Article · Mon Jan 09 19:00:00 EST 2023 · Corrosion

DOI: https://doi.org/10.5006/4241 · OSTI ID:2205325

^[1]; Lou, Xiaoyuan ^[1]

Purdue University, West Lafayette, IN (United States)

Additively manufactured (AM) 316L stainless steel (SS) manufactured by laser powder bed fusion (L-PBF) and wrought 316L SS were subjected to sensitization heat treatments at 700°C up to 100 h. Using two evaluation methods, double-loop electrochemical potentiokinetic reactivation (DL-EPR) and ditching tests, degree of sensitization (DOS) and intergranular corrosion (IGC) susceptibility was evaluated. It was found that the wrought samples showed slightly lower IGC susceptibility compared to their AM counterpart. DOS and IGC attacks increased with sensitization time for all samples. Dislocation cellular structures were found to have little to no impact on DOS and IGC for the AM samples. Sensitized at 100 h, the AM sample showed significant Cr depletion along high-angle grain boundaries (12.35 wt% on average) and exhibited Cr carbide precipitation. Mo-rich particles along grain boundaries were also observed. The DL-EPR test attacks the surface oxide film and grain boundaries while the ditching test attacks the melt pool boundaries and grain boundaries (IGC and pitting). Changes to the DL-EPR and ditching standards for AM application have been proposed in this work.

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Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: US Nuclear Regulatory Commission (NRC); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 2205325

Report Number(s):: INL/JOU--23-75500-Rev000

Journal Information:: Corrosion, Journal Name: Corrosion Journal Issue: 2 Vol. 79; ISSN 0010-9312

Publisher:: NACE InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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