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Open AccessArticle

Microstructure Evolution and Mechanical Stability of Retained Austenite in Thermomechanically Processed Medium-Mn Steel

1
Silesian University of Technology, Institute of Engineering Materials and Biomaterials, 18A Konarskiego Street, 44-100 Gliwice, Poland
2
Opel Manufacturing Poland Sp. Z o.o., 1 Adama Opla Street, 44-121 Gliwice, Poland
3
Institute for Ferrous Metallurgy, 12-14 K. Miarki Street, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(3), 501; https://doi.org/10.3390/ma12030501
Received: 28 December 2018 / Revised: 31 January 2019 / Accepted: 3 February 2019 / Published: 6 February 2019
A microstructure evolution of the thermomechanically processed 3Mn-1.5Al type steel and mechanical stability of retained austenite were investigated during interrupted tensile tests. The microstructural details were revealed using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. It was found that the strain-induced martensitic transformation began in central regions of the largest blocky-type grains of retained austenite and propagated to outer areas of the grains as the deformation level increased. At rupture, the mechanical stability showed only boundaries of fine blocky grains of γ phase and austenitic layers located between bainitic ferrite laths. The effects of various carbon enrichment, grain size, and location in the microstructure were considered. The martensitic transformation progress was the highest at the initial stage of deformation and gradually decreased as the deformation level increased. View Full-Text
Keywords: medium manganese steel; bainitic steel; transformation induced plasticity; retained austenite stability; interrupted tensile test; electron backscatter diffraction (EBSD) method medium manganese steel; bainitic steel; transformation induced plasticity; retained austenite stability; interrupted tensile test; electron backscatter diffraction (EBSD) method
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Grajcar, A.; Kilarski, A.; Kozłowska, A.; Radwański, K. Microstructure Evolution and Mechanical Stability of Retained Austenite in Thermomechanically Processed Medium-Mn Steel. Materials 2019, 12, 501.

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