Morphology change of retained austenite during austempering of carbide-freebainiticsteel
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in: Materials science and engineering: A, Structural materials: properties, microstructure and processing, Jahrgang 664.2016, Nr. 10 May, 2016, S. 236-246.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Morphology change of retained austenite during austempering of carbide-freebainiticsteel
AU - Hofer, Christina
AU - Winkelhofer, Florian
AU - Clemens, Helmut
AU - Primig, Sophie
PY - 2016
Y1 - 2016
N2 - A change in the mechanical properties of a carbide-free bainitic steel was observed during prolonged holding at austempering temperature after termination of the bainitic transformation. To determine the origin of the property change, the microstructure was investigated by correlative electron microscopy. Although the retained austenite content remains the same during prolonged holding, its morphology changes from thin films separating the individual bainitic sub-units to a more globular structure. Since films of austenite contain a higher C concentration, the blocky austenite becomes gradually enriched in C during this morphology change. The more homogeneous distribution of the C after prolonged austempering leads to higher deformability as a result of a more pronounced TRIP effect.
AB - A change in the mechanical properties of a carbide-free bainitic steel was observed during prolonged holding at austempering temperature after termination of the bainitic transformation. To determine the origin of the property change, the microstructure was investigated by correlative electron microscopy. Although the retained austenite content remains the same during prolonged holding, its morphology changes from thin films separating the individual bainitic sub-units to a more globular structure. Since films of austenite contain a higher C concentration, the blocky austenite becomes gradually enriched in C during this morphology change. The more homogeneous distribution of the C after prolonged austempering leads to higher deformability as a result of a more pronounced TRIP effect.
KW - Mechanical characterization
KW - Phase transformation
KW - Bainite
KW - Austenite
KW - Electron microscopy
U2 - 10.1016/j.msea.2016.04.005
DO - 10.1016/j.msea.2016.04.005
M3 - Article
VL - 664.2016
SP - 236
EP - 246
JO - Materials science and engineering: A, Structural materials: properties, microstructure and processing
JF - Materials science and engineering: A, Structural materials: properties, microstructure and processing
SN - 0921-5093
IS - 10 May
ER -
