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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. et Ghasemi-Nanesa, Hadi et 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.

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Résumé

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.

Type de document: Article publié dans une revue, révisé par les pairs
Professeur:
Professeur
Jahazi, Mohammad
Affiliation: Génie mécanique
Date de dépôt: 03 nov. 2017 20:16
Dernière modification: 04 déc. 2017 18:17
URI: http://espace2.etsmtl.ca/id/eprint/15832

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