Understanding contribution of microstructure to fracture behaviour of sintered steels

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dc.contributor.author Torralba Castelló, José Manuel
dc.contributor.author Esteban, L.
dc.contributor.author Bernardo Quejido, Elena
dc.contributor.author Campos Gómez, Mónica
dc.date.accessioned 2015-02-06T12:21:36Z
dc.date.issued 2014-12
dc.identifier.bibliographicCitation Powder Metallurgy (2014), 57(5), 357-364.
dc.identifier.issn 0032-5899 (print)
dc.identifier.issn 1743-2901 (online)
dc.identifier.uri http://hdl.handle.net/10016/20010
dc.description Proceedings of: Euro PM2014 Congress & Exhibition, Salzburg, Austria, 21-24 September 2014.
dc.description This paper was the winner of the EPMA PM Structural Parts Keynote Award made at Euro PM 2014
dc.description.abstract Microstructural features of sintered steels, which comprise both phases and porosity, strongly condition the mechanical behaviour of the material under service conditions. Many research activities have dealt with this relationship since better understanding of the microstructure&-property correlation is the key of improvement of current powder metallurgy (PM) steels. Up to now, fractographic investigation after testing has been successfully applied for this purpose and, more recently, the in situ analysis of crack evolution through the microstructure as well as some advanced computer assisted tools. However, there is still a lack of information about local mechanical behaviour and strain distributions at the microscale in relation to the local microstructure of these steels, i.e. which phases in heterogeneous PM microstructures contribute to localisation of plastic deformation or which phases can impede crack propagation during loading. In the present work, these questions are addressed through the combination of three techniques: (i) in situ tensile testing (performed in the SEM) to monitor crack initiation and propagation; (ii) digital image correlation technique to trace the progress of local strain distributions during loading; (iii) fractographic examination of the loaded samples. Three PM steels, all obtained from commercially available powders but presenting different microstructures, are examined: a ferritic-pearlitic Fe-C steel, a bainitic prealloyed Fe-Mo-C steel and a diffusion alloyed Fe-Ni-Cu-Mo-C steel, with more heterogeneous microstructure (ferrite, pearlite, upper and lower bainite, martensite and Ni rich austenite).
dc.description.sponsorship The authors wish to thank to Höganäs AB for providing all the raw materials to develop this work.
dc.format.extent 8
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher Maney Publishing
dc.rights © 2014 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute
dc.subject.other Sintered steels
dc.subject.other Fracture
dc.subject.other Crack growth
dc.subject.other Microstructure-property relationship
dc.subject.other In situ tensile testing
dc.subject.other Digital image correlation
dc.title Understanding contribution of microstructure to fracture behaviour of sintered steels
dc.type article
dc.type conferenceObject
dc.description.status Publicado
dc.relation.publisherversion http://dx.doi.org/10.1179/1743290114Y.0000000119
dc.subject.eciencia Materiales
dc.identifier.doi 10.1179/1743290114Y.0000000119
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.relation.eventdate 21-24 September 2014.
dc.relation.eventplace Salzburg, Austria
dc.relation.eventtitle Euro PM2014 Congress & Exhibition
dc.relation.eventtype proceeding
dc.identifier.publicationfirstpage 357
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 364
dc.identifier.publicationtitle Powder Metallurgy
dc.identifier.publicationvolume 57
dc.identifier.uxxi CC/0000022283
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