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Nanoscale phase separations in as-fabricated thick super duplex stainless steels
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-6242-3517
Department of Physics, Chalmers University of Technology, 412 96, Gothenburg (SWE).
Department of Physics, Chalmers University of Technology, 412 96, Gothenburg, (SWE).
Bodycote, 735 23, Surahammar (SWE).
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2021 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 56, no 21, p. 12475-12485Article in journal (Refereed) Published
Abstract [en]

Nanoscale phase separations, and effects of these, were studied for thick super duplex stainless steel products by atom probe tomography and mechanical testing. Although nanoscale phase separations typically occur during long-time service at intermediate temperatures (300-500 degrees C, our results show that slowly cooled products start to develop Fe and Cr separation and/or precipitation of Cu-rich particles already during fabrication. Copper significantly slowed down the kinetics at the expense of Cu-rich particle precipitation, where the high-copper material subjected to hot isostatic pressing (HIP), with Delta t(500-400) of 160 s and the low-copper hot-rolled plate with Delta t(500-400) of 2 s had the same level of Fe and Cr separation. The phase separations resulted in lower toughness and higher hardness of the HIP material than for hot-rolled plate. Therefore, both local cooling rate dependent and alloy composition governed variations of phase separations can be expected in as-fabricated condition.

Place, publisher, year, edition, pages
SPRINGER , 2021. Vol. 56, no 21, p. 12475-12485
Keywords [en]
Nanoscale phase separations, effects
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17200DOI: 10.1007/s10853-021-06056-0ISI: 000641219800006Scopus ID: 2-s2.0-85104858814OAI: oai:DiVA.org:hv-17200DiVA, id: diva2:1620745
Available from: 2021-12-16 Created: 2021-12-16 Last updated: 2021-12-16

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Hosseini, VahidKarlsson, Leif

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