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Possibilities and constraints of implementing starch consolidated high speed steel in prototyping
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
Vise andre og tillknytning
2008 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 475, nr 1-2, s. 34-38Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In the starch consolidation (SC) process, a water-based slurry containing powder, starch, dispersant and thickener is used to fabricate near net-shape green bodies that are de-binded and further consolidated by sintering. In this study, gas atomized M3/2 as well as high and low carbon V-rich M4 type high speed steel powder (<150 mu m) are considered, Both material types undergo high volumetric shrinkage during super-solidus liquid phase sintering enabling them to reach near full density. The analyses and the review cover different process aspects like: recipe optimisation, post-gelatinization drying, de-binding and sintering. A SC recipe consisting of 58 vol.% powder, 3 vol.% starch, 1 vol.% dispersant and a thickener solution resulted in a density of >98% than what is theoretically stated after sintering. It is found that the success of the post-gelatinization drying procedure depends on the smoothness of mould material and controlling powder oxidation. The best combination was freeze drying the slurry in a silicon rubber mould. For V-rich alloys a total or partial control of eutectic carbides in the final microstructure could be realized for vacuum and nitrogen sintering atmospheres, respectively.

sted, utgiver, år, opplag, sider
2008. Vol. 475, nr 1-2, s. 34-38
Emneord [en]
powder metallurgy, high speed steel, starch consolidation, prototyping, SLPS, review
HSV kategori
Identifikatorer
URN: urn:nbn:se:du-2720DOI: 10.1016/j.msea.2006.12.142ISI: 000253693100008OAI: oai:dalea.du.se:2720DiVA, id: diva2:519820
Konferanse
International Symposium on Inorganic Interfacial Engineering 2006
Tilgjengelig fra: 2007-04-11 Laget: 2007-04-11 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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