New Alloying Systems for Sintered Steels: Critical Aspects of Sintering Behavior

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Show simple item record Oro, Raquel Campos Gómez, Mónica Gierl-Mayer, Christian Danninger, Herbert Torralba Castelló, José Manuel 2015-01-26T11:27:22Z 2015-03
dc.identifier.bibliographicCitation Metallurgical and Materials Transactions A (2015), 46 (3), 1349-1359.
dc.identifier.issn 1073-5623 (print)
dc.identifier.issn 1543-1940 (online)
dc.description.abstract Oxygen-sensitive alloying elements such as Mn, Si, and Cr have a high potential for improving the properties of low alloyed sintered steels while reducing the alloying cost. However, it is necessary to find a way for avoiding, or at least minimizing, the oxidation of these elements especially during the early stages of the sintering cycle. In this study Mn, Si, and Cr were introduced in the form of a master alloy powder designed to be mixed with the iron base powder and provide the final composition of the steel during the sintering process. The reduction/oxidation phenomena taking place during the heating stage were studied by thermogravimetry, dilatometry, and mass spectroscopy, using either reducing (H2) or inert (Ar) atmospheres. The results show how the difference in chemical activity between base iron powder and master alloy causes the so called "internal-getter" effect, by which the reduction of less stable iron oxides leads to oxidation of the elements with higher affinity for oxygen. This effect can be somehow minimized when sintering in H2, since the iron oxides are reduced at lower temperatures at which the reactivity of the elements in the master alloy is lower. However, H2 concentration in the processing atmosphere needs to be carefully adapted to the specific composition of the materials being processed in order to minimize decarburization by methane formation during sintering.
dc.description.sponsorship Höganäs AB Sweden, financial support provided through the Höganäs Chair IV
dc.format.extent 11
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Springer
dc.rights © 2015 The Minerals, Metals & Materials Society and ASM International
dc.subject.other Sintering
dc.subject.other Sintering behavior
dc.subject.other Alloy
dc.subject.other Sintered Steels
dc.title New Alloying Systems for Sintered Steels: Critical Aspects of Sintering Behavior
dc.type article
dc.description.status Publicado
dc.subject.eciencia Materiales
dc.subject.eciencia Química
dc.identifier.doi 10.1007/s11661-014-2707-1
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1349
dc.identifier.publicationissue 3
dc.identifier.publicationlastpage 1359
dc.identifier.publicationtitle Metallurgical and materials transactions. A, Physical metallurgy and materials science
dc.identifier.publicationvolume 46
dc.identifier.uxxi AR/0000016031
dc.affiliation.dpto UC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química
dc.affiliation.grupoinv UC3M. Grupo de Investigación: Tecnología de Polvos
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