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Dynamic Recrystallizatin and Phase-Specific Corrosion Performance in a Super Duplex Stainless Steel
Dept of Metallurgical Engineering and Materials Science, Indian Inst of Technology, Bombay, Powai, Mumbai, India.
Materials Processing and Corrosion Engineering Division, Bhabha Atomic Research Centre, Trombay Mumbai, India.
Dept of Mechanical Engineerin, Indian Inst of Technology, Bombay, Powai, Mumbai, India.
Dept of Metallurgical Engineering and Materials Science, Indian Inst of Technology, Bombay, Powai, Mumbai, India.
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2021 (English)In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, article id 11665Article in journal (Refereed) Epub ahead of print
Abstract [en]

Super duplex stainless steel specimens were subjected to controlled (in a deformation simulator) thermal and thermal plus deformation treatments. The objective was to relate the corrosion performance with hot (1000-1300°C) deformed microstructures. The microstructural evolutions were quantified with extensive microtextural characterization and measurements of phase-specific micro-hardness. The corrosion behavior was investigated by anodic polarization and phase-specific selective dissolution methods. Though the thermal treatment imposed an increasing degradation in corrosion performance with holding temperature, the associated deformation at that temperature brought a non-monotonic behavior. The best corrosion performance (or the lowest passivation current density) was noted in the specimen deformed at ~1100°C. This superior corrosion behavior was attributed to the grain size refinement in the austenite phase. Finally, a combination of transmission Kikuchi diffraction (TKD) plus transmission electron microscopy (TEM) clearly related the grain size refinement to discontinuous dynamic recrystallization. The overall corrosion behavior was shown to be determined by a balance between decreasing austenite fraction and dynamic recrystallization-induced grain size refinement of the austenite phase.

Place, publisher, year, edition, pages
ASM International, 2021. article id 11665
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Materials Engineering
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URN: urn:nbn:se:liu:diva-180806DOI: 10.1007/s11665-021-06221-1ISI: 000698037800001Scopus ID: 2-s2.0-85115227854OAI: oai:DiVA.org:liu-180806DiVA, id: diva2:1607979
Available from: 2021-11-02 Created: 2021-11-02 Last updated: 2021-11-09Bibliographically approved

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Chai, Guocai

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