Mechanical and thermal stability of retained austenite in plastically deformed bainite-based TRIP-aided medium-Mn steels

Advanced medium-Mn sheet steels show an opportunity for the development of cost-effective and light-weight automotive parts with improved safety and optimized environmental performance. These steels utilize the strain-induced martensitic transformation of metastable retained austenite to improve the...

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2021-08, Vol.21 (3), p.133, Article 133
Main Authors: Kozłowska, Aleksandra, Grajcar, Adam, Janik, Aleksandra, Radwański, Krzysztof, Krupp, Ulrich, Matus, Krzysztof, Morawiec, Mateusz
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Automotive parts
Bainite
Bainitic transformations
Carbon
Civil Engineering
Cooling
Deformation
Dilatometry
Ductility
Electron backscatter diffraction
Electron microscopy
Engineering
High temperature
Hot rolling
Manganese steels
Martensitic transformations
Mechanical Engineering
Mechanical properties
Morphology
Original Article
Phase composition
Retained austenite
Stability analysis
Steel products
Structural Materials
Temperature
Temperature dependence
Tensile tests
Thermal stability
Weight reduction
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Summary:Advanced medium-Mn sheet steels show an opportunity for the development of cost-effective and light-weight automotive parts with improved safety and optimized environmental performance. These steels utilize the strain-induced martensitic transformation of metastable retained austenite to improve the strength–ductility balance. The improvement of mechanical performance is related to the tailored thermal and mechanical stabilities of retained austenite. The mechanical stability of retained austenite was estimated in static tensile tests over a wide temperature range from 20 °C to 200 °C. The thermal stability of retained austenite during heating at elevated temperatures was assessed by means of dilatometry. The phase composition and microstructure evolution were investigated by means of scanning electron microscopy, electron backscatter diffraction, X-ray diffraction and transmission electron microscopy techniques. It was shown that the retained austenite stability shows a pronounced temperature dependence and is also stimulated by the manganese addition in a 3–5% range.
ISSN:1644-9665
2083-3318
1644-9665
DOI:10.1007/s43452-021-00284-6