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In situ study of phase transformations during non-isothermal tempering of bainitic and martensitic microstructures

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Hesamodin Talebi, S., Ghasemi-Nanesa, Hadi, Jahazi, Mohammad et Melkonyan, Haikouhi. 2017. « In situ study of phase transformations during non-isothermal tempering of bainitic and martensitic microstructures ». Metals, vol. 7, nº 9.
Compte des citations dans Scopus : 8.

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Abstract

Phase transformations during non-isothermal tempering of bainitic or martensitic microstructures obtained after quenching of a medium-carbon low-alloy steel was studied. The microstructures correspond to different locations of an as-quenched large-sized forged ingot used as a die material in the automotive industry. High-resolution dilatometry experiments were conducted to simulate the heat treatment process, as well as to investigate different phenomena occurring during non-isothermal tempering. The microstructures were characterized using optical and scanning electron microscopy. Dilatometry analyses demonstrated that tempering behavior varied significantly from bainitic to martensitic microstructures. Retained austenite, which exists between bainitic ferrite sheaves, decomposes to lower bainite causing a remarkable volume increase. It was found that this decomposition finishes below 386 °C. By contrast, martensite tempering was accompanied with a volume decrease due to the decomposition of medium-carbon martensite to low carbon martensite and carbides.

Item Type: Peer reviewed article published in a journal
Professor:
Professor
Jahazi, Mohammad
Affiliation: Génie mécanique
Date Deposited: 03 Nov 2017 20:16
Last Modified: 04 Dec 2017 18:17
URI: https://espace2.etsmtl.ca/id/eprint/15832

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