Isothermal transformations in advanced high strength steels below martensite start temperature |
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| Authors: | E P Da Silva D De Knijf W Xu C Föjer Y Houbaert J Sietsma |
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| Affiliation: | 1. Department of Materials Science and Engineering, Ghent University. Technologiepark 903, Ghent, Belgiumelisabete.pintodasilva@ugent.be;3. Department of Materials Science and Engineering, Ghent University. Technologiepark 903, Ghent, Belgium;4. ArcelorMittal Global R&5. D Gent. Pres. J.F. Kennedylaan 3, Zelzate, Belgium;6. Department of Materials Science and Engineering, Delft University of Technology. 2628 CD Delft, The Netherlands |
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| Abstract: | AbstractThe transformation products in advanced high strength steels have been studied during the isothermal decomposition of austenite, subsequent to initial martensite formation. Rapid cooling to various temperatures below martensite start was carried out in a dilatometer with the intention to form controlled volume fractions of initial martensite and austenite, followed by isothermal holding. The transformation kinetics was monitored by means of dilatometry and microstructural characterisation by scanning electron microscopy, electron backscatter diffraction and X-ray diffraction. Hardness measurements of the resulting microstructures were analysed. The results revealed that the microstructures formed below MS are mainly composed of different fractions of tempered martensite, isothermal bainite with carbide precipitation and retained austenite. |
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| Keywords: | Transformation products AHSS Isothermal decomposition of austenite Below MS Dilatometry Microstructural characterisation |
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