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Graphite pore filling and surface blistering of sintered Fe-C-Si
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
2012 (Engelska)Ingår i: Powder Metallurgy, ISSN 0032-5899, E-ISSN 1743-2901, Vol. 55, nr 3, s. 242-247Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Different alloys of the system Fe-C-Si were sintered to obtain a grey iron microstructure and then hardened by post-sintering heat treatment to obtain a martensitic structure. The main problem in the development of this approach is related to the occurrence of surface blistering in the as sintered material when sintering in N2 atmosphere. Surface blistering is explained by the increase in entrapped gas pressure in pores caused by graphite pore filling. A mechanism has been proposed to explain graphite pore filling. According to this mechanism, graphite pore filling is caused by the C activity difference between the gas entrapped in pores and the matrix, which is a consequence of Boudouard’s reaction. This difference in C activity causes C to diffuse from the matrix to the pores, thus filling pores with graphite. © 2012 Institute of Materials, Minerals and Mining.

Ort, förlag, år, upplaga, sidor
2012. Vol. 55, nr 3, s. 242-247
Nyckelord [en]
Blistering; Gas pressures; Grey iron; Martensitic structures; N2 atmospheres; Pore filling; Post-sintering; Sintered materials; Surface blistering, Graphite; Liquid phase sintering; Porosity; Silicon; Surfaces, Sintering
Nationell ämneskategori
Materialteknik
Forskningsämne
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-12509DOI: 10.1179/1743290112Y.0000000024OAI: oai:DiVA.org:du-12509DiVA, id: diva2:622838
Tillgänglig från: 2013-05-23 Skapad: 2013-05-23 Senast uppdaterad: 2017-12-06Bibliografiskt granskad

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