Microstructure evolution during warm deformation of low carbon steel with dispersed cementite

dc.contributor.authorGallego, J. [UNESP]
dc.contributor.authorJorge, A. M.
dc.contributor.authorBalancin, O.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2014-05-27T11:22:42Z
dc.date.available2014-05-27T11:22:42Z
dc.date.issued2007-12-01
dc.description.abstractThe microstructure evolution and mechanical behavior during large strain of a 0.16%C-Mn steel has been investigated by warm torsion tests. These experiments were carried out at 685°C at equivalent strain rate of 0.1 s . The initial microstructure composed of a martensite matrix with uniformly dispersed fine cementite particles was attained by quenching and tempering. The microstructure evolution during tempering and straining was performed through interrupted tests. As the material was reheated to testing temperature, well-defined cell structure was created and subgrains within lath martensite were observed by TEM; strong recovery took place, decreasing the dislocation density. After 1 hour at the test temperature and without straining, EBSD technique showed the formation of new grains. The flow stress curves measured had a peculiar shape: rapid work hardening to a hump, followed by an extensive flow-softening region. 65% of the boundaries observed in the sample strained to ε = 1.0 were high angle grain boundaries. After straining to ε = 5.0, average ferrite grain size close to 1.5 μm was found, suggesting that dynamic recrystallization took place. Also, two sets of cementite particles were observed: large particles aligned with straining direction and smaller particles more uniformly dispersed. The fragmentation or grain subdivision that occurred during reheating and tempering time was essential for the formation of ultrafine grained microstructure.en
dc.description.affiliationDepart. Mechanical Engineering São Paulo State University, Ilha Solteira, SP
dc.description.affiliationDepart. Materials Engineering Federal University of São Carlos, São Carlos, SP
dc.description.affiliationUnespDepart. Mechanical Engineering São Paulo State University, Ilha Solteira, SP
dc.format.extent505-510
dc.identifierhttp://dx.doi.org/10.4028/www.scientific.net/MSF.558-559.505
dc.identifier.citationMaterials Science Forum, v. 558-559, n. PART 1, p. 505-510, 2007.
dc.identifier.doi10.4028/www.scientific.net/MSF.558-559.505
dc.identifier.issn0255-5476
dc.identifier.lattes7193872294818689
dc.identifier.orcid0000-0002-5477-8139
dc.identifier.scopus2-s2.0-38349140455
dc.identifier.urihttp://hdl.handle.net/11449/70101
dc.identifier.wosWOS:000250408000078
dc.language.isoeng
dc.relation.ispartofMaterials Science Forum
dc.relation.ispartofsjr0,180
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectMartensite
dc.subjectUltrafine grain
dc.subjectWarm deformation
dc.subjectCarbon steel
dc.subjectMicrostructure
dc.subjectTorsion testing
dc.subjectDeformation
dc.titleMicrostructure evolution during warm deformation of low carbon steel with dispersed cementiteen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.scientific.net/
unesp.author.lattes7193872294818689
unesp.author.lattes8878595413452908[2]
unesp.author.orcid0000-0002-9079-198X[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Ilha Solteirapt

Arquivos