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Microstructure evolution and mechanical behavior of a CMnSiAl TRIP steel subjected to partial austenitization along with quenching and partitioning treatment

journal contribution
posted on 2018-05-01, 00:00 authored by Hui Kong, Qi Chao, M H Cai, Erik Pavlina, Bernard RolfeBernard Rolfe, Peter HodgsonPeter Hodgson, Hossein BeladiHossein Beladi
The present study investigated the microstructure evolution and mechanical behavior in a low carbon CMnSiAl transformation-induced plasticity (TRIP) steel, which was subjected to a partial austenitization at 1183 K (910 °C) followed by one-step quenching and partitioning (Q & P) treatment at different isothermal holding temperatures of [533 K to 593 K (260 °C to 320 °C)]. This thermal treatment led to the formation of a multi-phase microstructure consisting of ferrite, tempered martensite, bainitic ferrite, fresh martensite, and retained austenite, offering a superior work-hardening behavior compared with the dual-phase microstructure (i.e., ferrite and martensite) formed after partial austenitization followed by water quenching. The carbon enrichment in retained austenite was related to not only the carbon partitioning during the isothermal holding process, but also the carbon enrichment during the partial austenitization and rapid cooling processes, which has broadened our knowledge of carbon partitioning mechanism in conventional Q & P process.

History

Journal

Metallurgical and materials transactions A: physical metallurgy and materials science

Volume

49

Issue

5

Pagination

1509 - 1519

Publisher

Springer

Location

New York, N.Y.

ISSN

1073-5623

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2018, The Minerals, Metals & Materials Society and ASM International