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Influence of C content and annealing temperature on the microstructures and tensile properties of Fe–13Mn–8Al–(0.7, 1.2)C steels
journal contribution
posted on 2020-05-01, 00:00 authored by D Han, H Ding, D Liu, Bernard RolfeBernard Rolfe, Hossein BeladiHossein BeladiIn the present work, the Fe-13Mn-8Al-(0.7, 1.2)C steels were subjected to different post-cold rolling annealing treatments in a temperature range of 800–1000 °C for 15 min to investigate the microstructural evolution and the mechanical properties. Both steels annealed at 800 °C consisted of fine austenite and ferrite grains along with intergranular κ-carbides formed by eutectoid reaction, which contributed to the high strength but deteriorated ductility. With annealing temperature increasing, the volume fraction of ferrite and intergranular κ-carbides progressively decreased. Meanwhile, the precipitation of intragranular κ′-carbides enhanced the yield strength, whereas coarse austenite was harmful to both strength and elongation. The increase in C content increased the volume fraction of intergranular κ-carbides and austenite as well as retarded the austenite recrystallization, which further increased strength and strain hardening rate but deteriorate ductility. The deformation mechanism in austenite was massive planar slip. The microbands were widely observed in both steels at an annealing temperature above 900 °C.
History
Journal
Materials science and engineering AVolume
785Article number
139286Pagination
1 - 12Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0921-5093Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
Keywords
Medium Mn low density steelκ-carbideMechanical propertiesCarbon contentStrain hardeningScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials Sciencekappa-carbideSTRAIN-HARDENING BEHAVIORHIGH-STRENGTHMECHANICAL-PROPERTIESDEFORMATION-BEHAVIORKAPPA-CARBIDESAL CONTENTMNAUSTENITEPRECIPITATIONEVOLUTIONMechanical Engineering
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