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Spinodal Decomposition in Functionally Graded Super Duplex Stainless Steel and Weld Metal
University West, Department of Engineering Science, Division of Welding Technology. Innovatum AB Trollhättan,Trollhättan,Sweden.ORCID iD: 0000-0001-6242-3517
Chalmers University of Technology, Department of Physics, Gothenburg,Sweden.
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-5110-449X
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-8822-2705
2018 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 49A, no 7, p. 2803-2816Article in journal (Refereed) Published
Abstract [en]

Low-temperature phase separations (T < 500 °C), resulting in changes in mechanical and corrosion properties, of super duplex stainless steel (SDSS) base and weld metals were investigated for short heat treatment times (0.5 to 600 minutes). A novel heat treatment technique, where a stationary arc produces a steady state temperature gradient for selected times, was employed to fabricate functionally graded materials. Three different initial material conditions including 2507 SDSS, remelted 2507 SDSS, and 2509 SDSS weld metal were investigated. Selective etching of ferrite significantly decreased in regions heat treated at 435 °C to 480 °C already after 3 minutes due to rapid phase separations. Atom probe tomography results revealed spinodal decomposition of ferrite and precipitation of Cu particles. Microhardness mapping showed that as-welded microstructure and/or higher Ni content accelerated decomposition. The arc heat treatment technique combined with microhardness mapping and electrolytical etching was found to be a successful approach to evaluate kinetics of low-temperature phase separations in SDSS, particularly at its earlier stages. A time-temperature transformation diagram was proposed showing the kinetics of 475 °C-embrittlement in 2507 SDSS.

Place, publisher, year, edition, pages
2018. Vol. 49A, no 7, p. 2803-2816
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12263DOI: 10.1007/s11661-018-4600-9ISI: 000433974400022Scopus ID: 2-s2.0-85045465335OAI: oai:DiVA.org:hv-12263DiVA, id: diva2:1202766
Note

First Online: 17 April 2018

Available from: 2018-04-30 Created: 2018-04-30 Last updated: 2018-07-04Bibliographically approved

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Hosseini, VahidWessman, StenKarlsson, Leif

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