Temperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modelling

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dc.contributor.authorPokluda, Jaroslavcs
dc.contributor.authorDlouhý, Ivocs
dc.contributor.authorKianicová, Martacs
dc.contributor.authorČupera, Jancs
dc.contributor.authorHorníková, Janacs
dc.contributor.authorŠandera, Pavelcs
dc.coverage.issue19cs
dc.coverage.volume14cs
dc.date.accessioned2021-10-11T14:56:33Z
dc.date.available2021-10-11T14:56:33Z
dc.date.issued2021-10-07cs
dc.description.abstractThe temperature dependence of tensile characteristics and fracture toughness of the standardly heat-treated low-alloyed steel OCHN3MFA along with three additionally heat-treated grades was experimentally studied. In the temperature range of 196; 22 °C, all the additional heat treatments transferred the standard steel from a high- to ultra-high strength levels even with improved tensile ductility characteristics. This could be explained by a reduction of the inclusion content, refinement of the martensitic blocks, ductile retained austenite content, and homogenization of the shape ratio of martensitic laths as revealed by metallographic, X-Ray, and EBSD techniques. On the other hand, the values of the fracture toughness of all grades were found to be comparable in the whole temperature range as the cause of a high stress triaxiality in the pre-cracked Charpy V-notch samples. The values of the fracture toughness of the standard steel grade could be predicted well using the fracture model proposed by Pokluda et al. based on the tensile characteristics. Such a prediction failed in the case of additionally heat-treated grades due to the different temperature dependence of the fracture mechanisms occurring in the tensile and fracture-toughness tests. While the tensile samples fractured in a ductile-dimple mode at all temperatures, the fracture-toughness specimens exhibited a transition from the ductile to quasi-brittle fracture mode with decreasing temperature. This transition could be interpreted in terms of a transfer from the model proposed by Rice and Johnson to the model of Tvergaard and Hutchinson.en
dc.formattextcs
dc.format.extent1-28cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMaterials . 2021, vol. 14, issue 19, p. 1-28.en
dc.identifier.doi10.3390/ma14195875cs
dc.identifier.issn1996-1944cs
dc.identifier.other172690cs
dc.identifier.urihttp://hdl.handle.net/11012/201772
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMaterialscs
dc.relation.urihttps://www.mdpi.com/1996-1944/14/19/5875cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1944/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectultra-high steel gradesen
dc.subjecttensile characteristicsen
dc.subjectfracture toughnessen
dc.subjecttemperature dependenceen
dc.subjectmodelling fractureen
dc.titleTemperature Dependence of Fracture Characteristics ofVariously Heat-Treated Grades of Ultra-High-Strength Steel:Experimental and Modellingen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-172690en
sync.item.dbtypeVAVen
sync.item.insts2022.01.03 12:54:50en
sync.item.modts2022.01.03 12:15:15en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Příprava a charakterizace nanostrukturcs
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav fyzikálního inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav materiálových věd a inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav mechaniky těles, mechatroniky a biomechanikycs
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Příprava a charakterizace nanostruktur
Ústav fyzikálního inženýrství
Ústav materiálových věd a inženýrství
Ústav mechaniky těles, mechatroniky a biomechaniky