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Graphite pore filling and surface blistering of sintered Fe-C-Si
Dalarna University, School of Technology and Business Studies, Materials Technology.
2012 (English)In: Powder Metallurgy, ISSN 0032-5899, Vol. 55, no 3, 242-247 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2012. Vol. 55, no 3, 242-247 p.
Keyword [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
National Category
Materials Engineering
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-12509DOI: 10.1179/1743290112Y.0000000024OAI: oai:DiVA.org:du-12509DiVA: diva2:622838
Available from: 2013-05-23 Created: 2013-05-23 Last updated: 2013-05-23Bibliographically approved

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
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Language
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  • nn-NB
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Output format
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