Effect of processing conditions on microstructural features in Mn&-Si sintered steels

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dc.contributor.author Oro, Raquel
dc.contributor.author Eduard, Hryha
dc.contributor.author Campos Gómez, Mónica
dc.contributor.author Torralba Castelló, José Manuel
dc.date.accessioned 2014-06-30T12:16:30Z
dc.date.available 2014-06-30T12:16:30Z
dc.date.issued 2014-09
dc.identifier.bibliographicCitation Materials characterization, Vol. 95 (Sep. 2014), pp. 105-117
dc.identifier.issn 1044-5803
dc.identifier.uri http://hdl.handle.net/10016/19027
dc.description.abstract Sintering of steels containing oxidation sensitive elements is possible if such elements are alloyed with others which present lower affinity for oxygen. In this work, a master alloy powder containing Fe–Mn–Si–C, specifically designed to create a liquid phase during sintering, has been used for such purpose. The effect of processing conditions such as sintering temperature and atmosphere was studied with the aim of describing the microstructural evolution as well as the morphology and distribution of oxides in the sintered material, evaluating the potential detrimental effect of such oxides on mechanical properties. Chemical analyses, metallography and fractography studies combined with X-ray photoelectron spectroscopy analyses on the fracture surfaces were used to reveal the main mechanism of fracture and their correlation with the chemical composition of the different fracture surfaces. The results indicate that the main mechanism of failure in these steels is brittle fracture in the surrounding of the original master alloy particles due to degradation of grain boundaries by the presence of oxide inclusions. Mn–Si oxide inclusions were observed on intergranular decohesive facets. The use of reducing atmospheres and high sintering temperatures reduces the amount and size of such oxide inclusions. Besides, high heating and cooling rates reduce significantly the final oxygen content in the sintered material. A model for microstructure development and oxide evolution during different stages of sintering is proposed, considering the fact that when the master alloy melts, the liquid formed can dissolve some of the oxides as well as the surface of the surrounding iron base particles.
dc.description.sponsorship The financial support provided by the Höganäs AB Sweden is gratefully acknowledged.
dc.format.extent 13
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Elsevier
dc.rights © 2014 Elsevier Inc.
dc.subject.other Powder metallurgy
dc.subject.other Master alloys
dc.subject.other Fe–Mn–Si–C
dc.subject.other Oxygen-sensitive elements
dc.subject.other Sintering behavior
dc.title Effect of processing conditions on microstructural features in Mn&-Si sintered steels
dc.type article
dc.relation.publisherversion http://dx.doi.org/10.1016/j.matchar.2014.06.011
dc.subject.eciencia Materiales
dc.identifier.doi 10.1016/j.matchar.2014.06.011
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 105
dc.identifier.publicationlastpage 117
dc.identifier.publicationtitle Materials characterization
dc.identifier.publicationvolume 95
dc.identifier.uxxi AR/0000015210
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