Microstructural evolution of 316L stainless steels with yttrium addition after mechanical milling and heat treatment

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dc.contributor.authorKotan, Hasan
dc.date.accessioned2024-02-23T14:13:18Z
dc.date.available2024-02-23T14:13:18Z
dc.date.issued2015
dc.departmentNEÜen_US
dc.description.abstractNanocrystalline 316L stainless steels with yttrium addition were prepared by mechanical milling at cryogenic temperature and subjected to annealing treatments at various temperatures up to 1200 degrees C. The dependence of hardness on the microstructure was utilized to study the mechanical changes in the steels occurring during annealing. The microstructural evolution of the as-milled and annealed steels was characterized by means of X-ray diffraction (XRD), focused ion beam microscopy (FIB) and transmission electron microscopy (TEM) techniques. The results have revealed that austenite in as-received powder partially transformed to martensite phase during mechanical milling whereas the annealing induced reverse transformation of martensite-to-austenite. Furthermore, while the austenite-to-martensite phase ratio increased with increasing annealing temperature, the equilibrium structure was not achieved after three hours heat treatments up to 1200 degrees C resulting in a dual-phased steels with around 10% martensite. The grain size of 316L steel was 19 nm after mechanical milling and remained around 116 nm at 1100 degrees C with yttrium addition as opposed to micron size grains of plain 316L steel at the same annealing temperature. Such microstructural features facilitate the use of these materials at elevated temperatures, as well as the development of scalable processing routes into a dense nanocrystalline compact. (C) 2015 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipTUBITAK [114M214]en_US
dc.description.sponsorshipThe research reported in this paper was supported by TUBITAK under Grant number 114M214. The author wishes to thank Bilkent-UNAM for electron microscopy investigations.en_US
dc.identifier.doi10.1016/j.msea.2015.09.011
dc.identifier.endpage143en_US
dc.identifier.issn0921-5093
dc.identifier.issn1873-4936
dc.identifier.scopus2-s2.0-84941283716en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage136en_US
dc.identifier.urihttps://doi.org/10.1016/j.msea.2015.09.011
dc.identifier.urihttps://hdl.handle.net/20.500.12452/12372
dc.identifier.volume647en_US
dc.identifier.wosWOS:000364250100017en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Science Saen_US
dc.relation.ispartofMaterials Science And Engineering A-Structural Materials Properties Microstructure And Processingen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectMechanical Millingen_US
dc.subjectGrain Refinementen_US
dc.subjectNanocrystalline Steelsen_US
dc.subjectGrain Growthen_US
dc.subjectThermal Stabilityen_US
dc.subjectMartensitic Transformationen_US
dc.titleMicrostructural evolution of 316L stainless steels with yttrium addition after mechanical milling and heat treatmenten_US
dc.typeArticleen_US

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