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Role of microstructure in the low cycle fatigue of multi-phase steels
journal contribution
posted on 2012-02-01, 00:00 authored by Tim HilditchTim Hilditch, Hossein BeladiHossein Beladi, Peter HodgsonPeter Hodgson, N StanfordThe low cycle fatigue (LCF) behaviour of several commercially-produced multiphase steels was studied; including dual-phase (DP) and transformation induced plasticity (TRIP). In addition, a novel TRIP980 hybrid microstructure was examined that consisted of coarse ferrite grains along with low temperature bainite regions interspersed with retained austenite. Fully reversed strain controlled fatigue tests were conducted on the different steels to determine the cyclic stress response and strain to failure. The effects of the cyclic deformation on the microstructures were analysed using electron backscattered diffraction (EBSD) and X-ray diffraction (XRD). Results showed that the initial cyclic hardening behaviour and low cyclic softening ratio observed in the TRIP steels was not necessarily due to austenite to martensite transformation. Differences between the austenite transformation behaviour of the conventional and novel hybrid TRIP microstructures was related to the different surrounding phases and the size of the retained austenite.
History
Journal
Materials science and engineering : AVolume
534Pagination
288 - 296Publisher
Elsevier S.A.Location
Lausanne, SwitzerlandISSN
0921-5093eISSN
1873-4936Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2011, Elsevier B.V.Usage metrics
Keywords
delaminationelectro-spinningScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceEBSDX-ray diffractionSteelAusteniteFatiguePhase transformationTRANSFORMATION-INDUCED PLASTICITYDUAL-PHASE STEELSTRIP STEELBEHAVIORDEFORMATIONTEMPERATUREMARTENSITESTABILITYMechanical Engineering
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