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Microstructure and functionality of a uniquely graded super duplex stainless steel designed by a novel arc heat treatment method
University West, Sweden ; Innovatum AB, Sweden.
University West, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. KTH Royal Institute of Technology, Sweden.
The University of Manchester, UK.
Show others and affiliations
2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 139, p. 390-400Article in journal (Refereed) Published
Abstract [en]

A novel arc heat treatment technique was applied to design a uniquely graded super duplex stainless steel (SDSS), by subjecting a single sample to a steady state temperature gradient for 10 h. A new experimental approach was used to map precipitation in microstructure, covering aging temperatures of up to 1430 °C. The microstructure was characterized and functionality was evaluated via hardness mapping. Nitrogen depletion adjacent to the fusion boundary depressed the upper temperature limit for austenite formation and influenced the phase balance above 980 °C. Austenite/ferrite boundaries deviating from Kurdjumov–Sachs orientation relationship (OR) were preferred locations for precipitation of σ at 630–1000 °C, χ at 560–1000 °C, Cr2N at 600–900 °C and R between 550 °C and 700 °C. Precipitate morphology changed with decreasing temperature; from blocky to coral-shaped for σ, from discrete blocky to elongated particles for χ, and from polygonal to disc-shaped for R. Thermodynamic calculations of phase equilibria largely agreed with observations above 750 °C when considering nitrogen loss. Formation of intermetallic phases and 475 °C-embrittlement resulted in increased hardness. A schematic diagram, correlating information about phase contents, morphologies and hardness, as a function of exposure temperature, is introduced for evaluation of functionality of microstructures. 

Place, publisher, year, edition, pages
2018. Vol. 139, p. 390-400
Keywords [en]
475 °C-embrittlement, Chi phase, Functionally graded microstructure, Nitrogen loss, R-phase, Sigma phase, Austenite, Chromium compounds, Cold rolling, Embrittlement, Hardness, Heat treatment, Microstructure, Nitrogen, Nitrogen compounds, Phase equilibria, Schematic diagrams, Stainless steel, Functionally graded microstructures, R phase, Temperature
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33894DOI: 10.1016/j.matchar.2018.03.024Scopus ID: 2-s2.0-85044113030OAI: oai:DiVA.org:ri-33894DiVA, id: diva2:1211061
Note

 Funding details: VINNOVA; Funding details: 2016-02834; Funding details: 20140130; Funding text: The financial support from the KK-foundation for the research school SiCoMaP ( 20140130 ) and the DUWELTOOL project ( 2016-02834 ) funded by Vinnova is acknowledged.

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-08-08Bibliographically approved

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