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Characterization of microstructures and tensile properties of TRIP-aided steels with different matrix microstructure
journal contribution
posted on 2014-07-29, 00:00 authored by C Wang, H Ding, Minghui Cai, Bernard RolfeBernard RolfeThree different heat treatment processes have been proposed as a fundamental method to produce three kinds of TRIP-aided steels with polygonal ferritic matrix (F-TRIP), bainitic matrix (B-TRIP) and martensitic matrix (M-TRIP) in a newly designed low alloy carbon steel. By means of dilatometry study and detailed characterization, the relationships among transformation, microstructure and the resulting mechanical behavior were compared and analyzed for the three cases. The work hardening of the samples was evaluated by calculating the instantaneous n value as a function of strain. The M-TRIP sample exhibits the highest strength with the highest work hardening rate at low strains and subsequent rapid descending at high strains. In contrast, the B-TRIP sample has relatively high continuously constant work hardening behavior over strain levels greater than 0.067. The difference in work hardening behavior corresponds directly to the rate of the retained austenite-martensitic transformation during straining, which can be attributed to the carbon content, the morphology of the retained austenite and the matrix microstructure in the respective TRIP-aided samples. © 2014 Elsevier B.V.
History
Journal
Materials Science and Engineering AVolume
610Pagination
65 - 75Publisher
Elsevier LtdLocation
Amsterdam, NetherlandsPublisher DOI
ISSN
0921-5093Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, Elsevier BVUsage metrics
Keywords
Instantaneous n valueMicrostructureRetained austeniteTensile propertyTRIP steelScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceINDUCED PLASTICITY STEELSSTRAIN-INDUCED TRANSFORMATIONMECHANICAL-PROPERTIESALLOYING ELEMENTSMULTIPHASE STEELSBAINITIC FERRITECARBONSTRENGTHDUCTILITYMechanical Engineering
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