On the pitting corrosion of 2205 duplex stainless steel produced by laser powder bed fusion additive manufacturing in the as-built and post-processed conditions

Nima Haghdadi; Majid Laleh; Hansheng Chen; Zibin Chen; Carina Ledermueller; Xiaozhou Liao; Simon Ringer; Sophie Primig

Materials & Design (Dec 2021)

On the pitting corrosion of 2205 duplex stainless steel produced by laser powder bed fusion additive manufacturing in the as-built and post-processed conditions

Nima Haghdadi,
Majid Laleh,
Hansheng Chen,
Zibin Chen,
Carina Ledermueller,
Xiaozhou Liao,
Simon Ringer,
Sophie Primig

Affiliations

Nima Haghdadi: School of Materials Science & Engineering, UNSW Sydney, NSW 2052, Australia; Corresponding authors.
Majid Laleh: School of Engineering, Deakin University, Waurn Ponds, VIC 3216, Australia; Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC 3216, Australia
Hansheng Chen: Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
Zibin Chen: Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia; Department of Industrial and Systems Engineering, The Hong Kong polytechnic University, Hong Kong, China
Carina Ledermueller: School of Materials Science & Engineering, UNSW Sydney, NSW 2052, Australia
Xiaozhou Liao: Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
Simon Ringer: Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia
Sophie Primig: School of Materials Science & Engineering, UNSW Sydney, NSW 2052, Australia; Corresponding authors.

Journal volume & issue: Vol. 212
p. 110260

Abstract

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The effects of additive manufacturing (AM) and post-AM heat treatment on microstructural characteristics and pitting corrosion of 2205 duplex stainless steel were studied and benchmarked against its conventionally hot-rolled counterpart. The rapid solidification and possible loss of N associated with AM resulted in a non-equilibrium microstructure dominated by δ-ferrite with a minor fraction of austenite and abundant Cr2N precipitation. Atom probe tomography revealed that no depletion of Cr occurs around intragranular Cr2N. A deduction in Cr was observed adjacent to intergranular Cr2N particles, however, Cr content in these regions remained above the critical value of 13 wt%. Post-AM heat treatment was effective in restoring the duplex microstructure while dissolving the Cr2N precipitates. Although the pitting resistance in the as-built AM specimen was lower than that of its hot-rolled counterpart, it was fully recovered after post-AM heat treatment.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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