Production and heat treatment of cast graphitic steels with additions of niobium

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dc.contributor.authorSoufen, C.A. [UNESP]
dc.contributor.authorCasteletti, L.C.
dc.contributor.authorLombardi, Neto A.
dc.contributor.authorTotten, G.E.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionPortland State University
dc.date.accessioned2014-05-27T11:22:48Z
dc.date.available2014-05-27T11:22:48Z
dc.date.issued2008-02-01
dc.description.abstractThe optimal combination of the mechanical characteristics of austempered spheroidal graphitic cast steel together with modern casting techniques yielded an economically promising product. The maximum potentiality of the usage of these steels is related to fabrication and characterization techniques, among which, one of the most important is the cooling diagram (TTT curve). In this work, 3 heats of graphitic steels with the following nominal compositions were cast: 1.0%C, 2.3%Si, 0.4% Mn, and with niobium contents of 0.0%, 0.5% and 1.0%. TTT curves were determined by dilatometric testing and test specimens of these steels were austempered. The samples were then characterized by hardness testing and optical and SEM microscopy. Tensile, impact (no notch) and wear testing were also performed. The addition of niobium produced significant alterations in the TTT diagrams. Increasing niobium content moves the pearlite transformation nose to the right and the bainitic transformation nose to the left. Tensile strength of these alloys was high, in the range of 1700 MPa and impact values were around of 45 Joules for alloy with 1% Nb, 49 Joules for alloy with 0.5% Nb and fracture did not occur for the alloy without the addition of Nb.en
dc.description.affiliationUNESP, Bauru, São Paulo
dc.description.affiliationEscola de Eng. de Sao Carlos-USP, Sao Carlos, Sao Paulo
dc.description.affiliationPortland State University, Portland, Oregon
dc.description.affiliationUnespUNESP, Bauru, São Paulo
dc.format.extent16-19
dc.identifier.citationJinshu Rechuli/Heat Treatment of Metals, v. 33, n. 2, p. 16-19, 2008.
dc.identifier.issn0254-6051
dc.identifier.scopus2-s2.0-84860124375
dc.identifier.urihttp://hdl.handle.net/11449/70304
dc.language.isoeng
dc.relation.ispartofJinshu Rechuli/Heat Treatment of Metals
dc.relation.ispartofsjr0,230
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.titleProduction and heat treatment of cast graphitic steels with additions of niobiumen
dc.typeArtigo
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Engenharia, Baurupt

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