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Precipitation kinetics of Cu-rich particles in super duplex stainless steels
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-6242-3517
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0002-0234-3168
Bodycote, Surahammar (SWE).
Outokumpu Stainless AB, Avesta (SWE).
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2021 (English)In: Journal of Materials Research and Technology, ISSN 2238-7854, Vol. 15, p. 3951-3964Article in journal (Refereed) Published
Abstract [en]

Complex precipitation behavior of Cu-rich particles (CRPs) was investigated and simulated in continuously cooled and quench-aged super duplex stainless steel. Atom probe tomography (APT) and scanning electron microscopy showed that slow cooling resulted in nonuniform multimodal CRP precipitation and spinodal decomposition, while in the fast cooled and quench-aged conditions, more uniform precipitation of CRPs with no visible spinodal decomposition was found. Depletion of Cu, Ni, and Mn was observed in the ferrite next to the CRPs during growth, but not during dissolution. Some evidence of Ostwald ripening was seen after slow cooling, but in the quench-aged condition, particle coalescence was observed. Large CRPs disappeared next to a ferrite–austenite phase boundary after slow cooling when Cu was depleted due to the diffusion to austenite as also predicted by moving boundary Dictra simulation. Comparing Cu depleted areas next to CRPs analyzed by APT and moving boundary Dictra simulation of CRP–ferrite showed that the effective Cu diffusion coefficient during the early-stage precipitation was about 300 times higher than the Cu diffusion coefficient in ferrite at 475 °C. Using the effective diffusion coefficient and a size-dependent interfacial energy equation, CRP size distribution was successfully predicted by the Langer–Schwartz model implemented in Thermo-Calc Prisma. Applying a short aging time and continuous cooling increased the hardness and decreased the toughness values compared to the solution annealed condition. A nonuniform distribution of Cu in ferrite, the duplex structure, and partitioning of alloying elements among different phases are factors making CRP precipitation in duplex stainless steels complex.

Place, publisher, year, edition, pages
Elsevier Editora Ltda , 2021. Vol. 15, p. 3951-3964
Keywords [en]
Precipitation kinetics, Duplex stainless steels, Moving phase boundary simulation, Atom probe tomography
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hv:diva-17788DOI: 10.1016/j.jmrt.2021.10.032ISI: 000712078600010Scopus ID: 2-s2.0-85117610752OAI: oai:DiVA.org:hv-17788DiVA, id: diva2:1622005
Funder
Knowledge FoundationAvailable from: 2021-12-21 Created: 2021-12-21 Last updated: 2021-12-21

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Hosseini, VahidHurtig, KjellKarlsson, Leif

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