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Corrosion resistance and microstructure analysis of additively manufactured 22% chromium duplex stainless steel by laser metal deposition with wire

Baghdadchi, Amir, 1994- (författare)
Högskolan Väst,Avdelningen för svetsteknologi (SV),KAMPT
Cary, Claire (författare)
Department of Materials Science and Engineering, The Ohio State University, Columbus (USA)
Sridhar, Narasi (författare)
Department of Materials Science and Engineering, The Ohio State University, Columbus (USA)
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Valiente Bermejo, María Asunción, 1972- (författare)
Högskolan Väst,Avdelningen för svetsteknologi (SV),KAMPT
Fink, Carolin (författare)
Department of Materials Science and Engineering, The Ohio State University, Columbus (USA)
Andersson, Joel, 1981- (författare)
Högskolan Väst,Avdelningen för svetsteknologi (SV),KAMPT
visa färre...
 (creator_code:org_t)
2023
2023
Engelska.
Ingår i: Journal of Materials Research and Technology. - 2238-7854 .- 2214-0697. ; 26, s. 6741-6756
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Microstructure characteristics and pitting corrosion of a duplex stainless steel (DSS) manufactured by laser metal deposition with wire (LMDw) were studied. The layer-by-layer LMDw process resulted in a mixed microstructure of predominantly ferrite with 2% austenite and chromium-rich nitrides, and reheated regions with ~33% austenite. The high cooling rate of LMDw restricted the distribution of Cr, Mo, and Ni, in ferrite and austenite, while N diffuses from ferrite to austenite. Subsequent heat treatment at 1100 C for 1 h resulted in homogenized microstructure, dissolution of nitrides, and balanced ferrite/austenite ratio. It also led to the redistribution of Cr and Mo to ferrite, and Ni and N to austenite. At room temperature, cyclic potentiodynamic polarization measurements in 1.0 M NaCl solution showed no significant differences in corrosion resistance between the as-deposited and heat-treated samples, despite the differences in terms of ferrite to austenite ratio and elemental distribution. Critical pitting temperature (CPT) was the lowest (60 C) for the predominantly ferritic microstructure with finely dispersed chromium-rich nitrides; while reheated area with ~33% austenite in as-deposited condition achieved higher critical temperature comparable to what was obtained after heat treatment (73 and 68 C, respectively). At temperatures above the CPT, selective dissolution of the ferrite after deposition was observed due to depletion of N, while after heat treatment, austenite preferentially dissolved due to Cr and Mo concentrating in ferrite. In summary, results demonstrate how microstructural differences in terms of ferrite-to-austenite ratio, distribution of corrosion-resistant elements, and presence of nitrides affect corrosion resistance of LMDw DSS.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

Nyckelord

Additive manufacturing
Duplex stainless steel
Laser metal deposition
Localized corrosion
Microstructure-property relation
Production Technology
Produktionsteknik

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