Corrosion of 316L stainless steel produced by laser powder bed fusion and powder metallurgy in pressurized water reactor primary coolant

Martin Bojinov, Litao Chang, Timo Saario, Zaiqing Que (Corresponding Author)

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Abstract

Corrosion mechanism of 316 L stainless steel produced by laser powder bed fusion-hot isostatic pressing (LPBF-HIP) and powder metallurgy-hot isostatic pressing (PM-HIP) is studied with in-situ electrochemical impedance measurements coupled to detailed oxide film characterization. Quantitative analysis of impedance spectra using the Mixed-Conduction Model and estimation of local kinetic and transport parameters by interpretation of in-depth elemental composition profiles indicated lower corrosion and oxidation rates of LPBF-HIP and PM-HIP materials in comparison to conventional wrought 316 L. This owes to a higher fraction of low-angle grain boundaries, smaller grain size, the presence of nano-sized oxide particles and elevated Cr and Ni contents.
Original languageEnglish
Article number102055
Pages (from-to)102055
JournalMaterialia
Volume34
DOIs
Publication statusPublished - 1 May 2024
MoE publication typeA1 Journal article-refereed

Funding

The work is funded by VTT, SINAP and UCTM. M. Bojinov acknowledges the funding from National Recovery and Resilience Plan of the Republic of Bulgaria (project No. BG-RRP-2.004-0002 “BiOrgaMCT”). L. Chang acknowledges the funding from SINAP (No. E051011031) and Innovation Funding of Shanghai Jiading District (No. E339031031). T. Saario and Z. Que acknowledge the funding from Finnish SAFER2028 (National Nuclear Safety and Waste Management Research Programme 2023-2028) LOAD project (Long-term Operation on Aging and environmental Degradation of nuclear reactor materials). The authors would like to express their gratitude for the experimental contributions of A. Toivonen, T. Lehtikuusi, S. Goel, T. Ikäläinen, J. Rantala, K. Sipilä and P. Väisänen from VTT.

Keywords

  • Additive manufacturing
  • Austenitic stainless steel
  • Corrosion mechanism
  • Hot isostatic pressing
  • Laser powder bed fusion
  • Powder metallurgy

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