Mechanical Properties of a Bainitic Steel Producible by Hot Rolling

• Autorzy: Rana R. , Chen S. , Haldar A. , Das S.

Identyfikatory

DOI

10.1515/amm-2017-0342

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

carbide-free bainite; retained austenite; hot rolling; mechanical properties

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2017
• Tom: Vol. 62, iss. 4
• Strony: 2331--2338
• Opis fizyczny: Bibliogr. 21 poz., rys., tab., wykr.

Twórcy

autor

Rana R.

• Tata Steel, Wenckebachstraat 1, 1970 Ca IJmuiden, The Netherlands

autor

Chen S.

• Tata Steel, Wenckebachstraat 1, 1970 Ca IJmuiden, The Netherlands

autor

Haldar A.

• Tata Steel, Moorgate, Rotherham S60 3AR, Road The United Kingdom

autor

Das S.

• Tata Steel, Wenckebachstraat 1, 1970 Ca IJmuiden, The Netherlands
• IIT Roorkee, Uttarakhand, PIN 247667, India

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).