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Title: Mechanical properties of a bainitic steel producible by hot rolling
Authors: Rana R.
Chen S.
Haldar A.
Das, Sourav
Published in: Archives of Metallurgy and Materials
Abstract: A carbide-free bainitic microstructure is suitable for achieving a combination of ultra high strength and high ductility. In this work, a steel containing nominally 0.34C-2Mn-1.5Si-1Cr (wt.%) was produced via industrial hot rolling and laboratory heat treatments. The austenitization (900°C, 30 min.) and austempering (300-400°C, 3 h) treatments were done in salt bath furnaces. The austempering treatments were designed to approximately simulate the coiling step, following hot rolling and run-out-table cooling, when the bainitic transformation would take place and certain amount of austenite would be stabilized due to suppression of carbide precipitation. The microstructures and various mechanical properties (tensile properties, bendability, flangeability, and room and subzero temperature impact toughness) relevant for applications were characterized. It was found that the mechanical properties were highly dependent on the stability of the retained austenite, presence of martensite in the microstructure and the size of the microstructural constituents. The highest amount of retained austenite (∼ 27 wt.%) was obtained in the sample austempered at 375°C but due to lower austenite stability and coarser overall microstructure, the sample exhibited lower tensile ductility, bendability, flangeability and impact toughness. The sample austempered at 400°C also showed poor properties due to the presence of initial martensite and coarse microstructure. The best combination of mechanical properties was achieved for the samples austempered at 325-350°C with a lower amount of retained austenite but with the highest mechanical stability. © 2017 R. Rana et al., published by De Gruyter Open 2017.
Citation: Archives of Metallurgy and Materials (2017), 62(4): 2331-2338
Issue Date: 2017
Publisher: De Gruyter Open Ltd
Keywords: Carbide-Free Bainite
Hot Rolling
Mechanical Properties
Retained Austenite
ISSN: 17333490
Author Scopus IDs: 15837782200
Author Affiliations: Rana, R., Tata Steel, Wenckebachstraat 1, Ijmuiden, 1970 Ca, Netherlands
Chen, S., Tata Steel, Wenckebachstraat 1, Ijmuiden, 1970 Ca, Netherlands
Haldar, A., Tata Steel, Moorgate Road, Rotherham, S60 3AR, United Kingdom
Das, S., IIT Roorkee, Uttarakhand, 247667, India
Corresponding Author: Rana, R.; Tata Steel, Wenckebachstraat 1, Netherlands; email:
Appears in Collections:Journal Publications [MT]

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