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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 BeladiThe 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 scienceVolume
49Issue
5Pagination
1509 - 1519Publisher
SpringerLocation
New York, N.Y.Publisher DOI
ISSN
1073-5623Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2018, The Minerals, Metals & Materials Society and ASM InternationalUsage metrics
Keywords
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceHIGH-STRENGTH STEELSLOW-CARBON STEELWORK-HARDENING BEHAVIORRETAINED AUSTENITEM-SP STEELBAINITE FORMATIONMARTENSITE-TRANSFORMATIONALLOYING ELEMENTSTHERMAL-STABILITYMechanical Engineering
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