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Reverse martensitic transformation and resulting microstructure in a cold rolled metastable austenitic stainless steel
Luleå tekniska universitet.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-2286-5588
2008 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 79, no 6, p. 433-439Article in journal (Refereed) Published
Abstract [en]

The reverse martensitic transformation in cold-rolled metastable austenitic stainless steel has been investigated via heat treatments performed for various temperatures and times. The microstructural evolution was evaluated by differential scanning calorimetry, X-ray diffraction and microscopy. Upon heat treatment, both diffusionless and diffusion-controlled mechanisms determine the final microstructure. The diffusion reversion from α′-martensite to austenite was found to be activated at about 450°C and the shear reversion is activated at higher temperatures with Af′ ∼600°C. The resulting microstructure for isothermal heat treatment at 650°C was austenitic, which inherits the α′-martensite lath morphology and is highly faulted. For isothermal heat treatments at temperatures above 700°C the faulted austenite was able to recrystallize and new austenite grains with a low defect density were formed. In addition, carbo-nitride precipitation was observed for samples heat treated at these temperatures, which leads to an increasing Ms-temperature and new α′-martensite formation upon cooling.

Place, publisher, year, edition, pages
2008. Vol. 79, no 6, p. 433-439
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-10957DOI: 10.2374/SRI08SP039-79-2008-433ISI: 000257357500005Scopus ID: 2-s2.0-47349118099Local ID: 9da81870-7375-11dd-a60f-000ea68e967bOAI: oai:DiVA.org:ltu-10957DiVA, id: diva2:983905
Note
Validerad; 2008; 20080826 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2020-01-31Bibliographically approved

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Hedström, PeterOdén, Magnus

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CiteExportLink to record
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