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Temperature-Stimulated Morphological Features of Advanced High-Strength Medium-Mn TRIP Steel

Published online by Cambridge University Press:  02 February 2022

Aleksandra Kozłowska ,
Adam Grajcar Open the ORCID record for Adam Grajcar [Opens in a new window] ,
Krzysztof Matus ,
Aleksandra Janik ,
Krzysztof Radwański  and
Wojciech Pakieła
Aleksandra Kozłowska
Affiliation:
Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18a Konarskiego Street, 44-100 Gliwice, Poland
Adam Grajcar*
Affiliation:
Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18a Konarskiego Street, 44-100 Gliwice, Poland
Krzysztof Matus
Affiliation:
Materials Research Laboratory, Silesian University of Technology, 18a Konarskiego Street, 44-100 Gliwice, Poland
Aleksandra Janik
Affiliation:
Łukasiewicz Research Network – Institute for Ferrous Metallurgy, 12-14 K. Miarki Street, 44-100 Gliwice, Poland
Krzysztof Radwański
Affiliation:
Łukasiewicz Research Network – Institute for Ferrous Metallurgy, 12-14 K. Miarki Street, 44-100 Gliwice, Poland
Wojciech Pakieła
Affiliation:
Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18a Konarskiego Street, 44-100 Gliwice, Poland
*
*Corresponding author: Adam Grajcar, E-mail: adam.grajcar@polsl.pl
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Abstract

Advanced High-Strength Steels (AHSSs) are one of the most rapidly developing group of Fe-based metallic materials. Their excellent combination of high strength, ductility and formability is due to their complex microstructure and strain-induced martensitic transformation of metastable retained austenite (RA), which favors extra ductility of the sheet steels. A deformation temperature is one of the most important factors affecting the phase transformation behavior in these Fe–C–Mn–Al–Si systems. Therefore, the present study aimed at understanding the temperature-dependent phase transformations and structural phenomena in an advanced medium-Mn–Al-alloyed steel. The 3Mn steel was thermomechanically processed and subjected to tensile testing in a temperature range from 20°C to 200°C. The different extent of the strain-induced martensitic transformation and some softening phenomena of bainitic ferrite matrix were revealed using transmission electron microscopy and electron backscatter diffraction techniques. It was found that the thermal stability of RA is strongly dependent on the deformation temperature. Moreover, the dynamic recovery and carbide precipitation play a key role when the deformation temperature is increased to 140°C and higher temperatures.

Keywords

carbide precipitationdynamic recoverymedium-Mn steelretained austenitestrain-induced martensite
Type
The XVIIth International Conference on Electron Microscopy (EM2020)
Information
Microscopy and Microanalysis , Volume 28 , Issue 3 , June 2022 , pp. 975 - 982
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of the Microscopy Society of America

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