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Multi-phase microstructure design of a novel high strength TRIP steel through experimental methodology
journal contribution
posted on 2014-07-29, 00:00 authored by C Wang, H Ding, Minghui Cai, Bernard RolfeBernard RolfeThe multi-phase structure of a novel low-alloy transformation induced plasticity (TRIP) steel was designed through experimental analysis. The evolutions of both microstructure and mechanical properties during the two-stage heat treatment were analyzed. The phase transformations during the intercritical annealing and the isothermal bainitic transformation were investigated by means of dilatometry. It was shown that two types of C diffusion were detected during intercritical annealing and a complex microstructure was formed after heat treatment. The processing parameters were selected in such a way to obtain microstructures with systematically different volume fractions of ferrite, bainite and retained austenite. The volume fractions of ferrite and retained austenite were found to be two main factors controlling the ductility. Furthermore, a high volume fraction of C-rich retained austenite, which was stabilized at room temperature, was the origin of a TRIP effect. The resulting material demonstrates a significant improvement in the ultimate tensile strength (1077. MPa) with good uniform elongation (22.5%), as compared to conventional TRIP steels. © 2014 Elsevier B.V.
History
Journal
Materials science and engineering aVolume
610Pagination
436 - 444Publisher
Elsevier BVLocation
Amsterdam, NetherlandsPublisher DOI
ISSN
0921-5093Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, Elsevier BVUsage metrics
Keywords
Alloying elementIntercritical annealingIsothermal bainitic transformationRetained austeniteTRIP effectScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceINDUCED PLASTICITY STEELSAIDED SHEET STEELSMECHANICAL-PROPERTIESPHASE-TRANSFORMATIONSINBALDEFORMATIONSTABILITYMechanical Engineering
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