Biaxial deformation behavior of friction stir processed TRIP steel sheets

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dc.contributor.authorÖztürk Yılmaz, İmren
dc.contributor.authorSaray, Onur
dc.contributor.authorYılmaz, Mümin
dc.date.accessioned2021-03-20T20:30:43Z
dc.date.available2021-03-20T20:30:43Z
dc.date.issued2019
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, Makine Mühendisliği Bölümüen_US
dc.description.abstractIn this study, effects of Friction Stir Processing (FSP) on the biaxial deformation behavior of 1.95 mm thick TRIP 780 steel sheets were investigated. FSP induced large plastic shear strains imposed at elevated temperature of about 945°C have drastically changed both microstructure and flow behavior of the steel. For these reason, after the FSP, significant changes in the microstructural and mechanical properties were obtained. After FSP, initial microstructure of the TRIP-steel transformed into a microstructure that mainly dominated by martensite grains. This transformation resulted with nearly two-fold hardness increase in stir zone. Similarly, lath martensite dominated microstructure elevated the FSPed condition into an ultra-high strength level with expense of room temperature ductility. After FSP, yield strength and UTS increased from 415MPa and 829 MPa to about 1280 MPa and 1475 MPa. Uniform elongation and elongation to failure decreased from 23% and 11% to 34% and 22% respectively. In accordance to decreased ductility, Erichsen index (EI) of the steel decreased from 9.16 mm to 4.90 mm under biaxial stretching conditions In contrast to strength enhancement punch force at EI of TRIP-780 also decreased from 80.6 kN to 45.4 kN respectively. This simultaneous decrease in both Ei and FEi attributed to increase in cracking tendency of the FSP induced microstructure.en_US
dc.identifier.doi10.26701/ems.570940en_US
dc.identifier.endpage61en_US
dc.identifier.issn2587-1110
dc.identifier.issue2en_US
dc.identifier.startpage56en_US
dc.identifier.urihttp://doi.org/10.26701/ems.570940
dc.identifier.urihttps://app.trdizin.gov.tr/makale/TXpNNE5UWTFOUT09
dc.identifier.urihttps://hdl.handle.net/20.500.12885/1428
dc.identifier.volume3en_US
dc.indekslendigikaynakTR-Dizinen_US
dc.institutionauthorÖztürk Yılmaz, İmren
dc.language.isoenen_US
dc.relation.ispartofEuropean Mechanical Scienceen_US
dc.relation.publicationcategoryMakale - Ulusal Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMühendislik, Makineen_US
dc.titleBiaxial deformation behavior of friction stir processed TRIP steel sheetsen_US
dc.typeArticleen_US

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