Effect of double hit hot deformation on the evolution of dynamically transformed ferrite

Chadha, K., Aranas, C. et Jahazi, M.. 2021. « Effect of double hit hot deformation on the evolution of dynamically transformed ferrite ». Metals and Materials International, vol. 27, nº 11. pp. 4307-4321.
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Résumé

Double-hit hot compression tests were carried on medium-carbon low-alloy steels using Gleeble 3800® thermomechanical simulator. The experiments were performed at strain rates of 0.25 and 0.5 s−1 and temperatures of 1150 and 1200 °C with interpass times of 5, 15, and 25 s. The onset of critical stresses for dynamic transformation (DT) for both first and second hit were detected using the double-differentiation method. It was found that the critical stress for DT increased with a decrease in temperature and an increase in strain rate. The presence of dynamically transformed ferrite was observed and quantified using electron-backscatter diffraction, kernal average misorientation, and grain boundary maps. Then, a thermodynamic analysis was carried out using JmatPro software. A method of determining the change in Gibbs energy during DT phenomenon is proposed for double hit deformation.

Type de document:	Article publié dans une revue, révisé par les pairs
Professeur:	Professeur Jahazi, Mohammad
Affiliation:	Génie mécanique
Date de dépôt:	23 oct. 2020 18:07
Dernière modification:	13 avr. 2023 16:08
URI:	https://espace2.etsmtl.ca/id/eprint/21271

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