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Retained Austenite Decomposition and Carbide Precipitation during Isothermal Tempering of a Medium-Carbon Low-Alloy Bainitic Steel

1
Département de Génie Mécanique, École de Technologie Supérieure, Montréal, QC H3C 1K3, Canada
2
Finkl Steel Inc., 100 McCarthy, Saint-Joseph-de-Sorel, QC J3R 3M8, Canada
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(8), 1441; https://doi.org/10.3390/ma11081441
Received: 7 July 2018 / Revised: 13 August 2018 / Accepted: 13 August 2018 / Published: 15 August 2018
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Abstract

The effect of isothermal tempering on retained austenite decomposition and carbide precipitation were investigated in a medium-carbon low-alloy bainitic steel. High-resolution dilatometry was used to perform isothermal tempering at 350 °C, 550 °C and 600 °C for different holding times up to 16 h. The decomposition of retained austenite, morphology and composition of carbides were investigated by analyzing the dilatometric curves and were confirmed through scanning and transmission electron microscopy observations. The decomposition behavior of retained austenite varied significantly as a function of the tempering temperature with a full decomposition observed at 600 °C. It was also found that by increasing the tempering temperature from 550 °C to 600 °C, carbides precipitate approximately twice as fast, and evolve from M3C type to Cr7C3 and Cr23C6 after 16 h of tempering at 600 °C. View Full-Text
Keywords: tempering; dilatometry; retained austenite; chromium carbide; transmission electron microscopy (TEM) tempering; dilatometry; retained austenite; chromium carbide; transmission electron microscopy (TEM)
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MDPI and ACS Style

Talebi, S.H.; Jahazi, M.; Melkonyan, H. Retained Austenite Decomposition and Carbide Precipitation during Isothermal Tempering of a Medium-Carbon Low-Alloy Bainitic Steel. Materials 2018, 11, 1441.

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