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Possibilities and constraints of implementing starch consolidated high speed steel in prototyping
Chalmers University of Technology, Göteborg, Sweden.
Dalarna University, Borlänge, Sweden.
Dalarna University, Borlänge, Sweden.
Università di Trento, Trento, Italy.
Visa övriga samt affilieringar
2008 (Engelska)Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 475, nr 1-2, s. 34-38Artikel i tidskrift (Refereegranskat) Published
Ort, förlag, år, upplaga, sidor
2008. Vol. 475, nr 1-2, s. 34-38
Nationell ämneskategori
Materialteknik
Forskningsämne
Materialteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-2023DOI: 10.1016/j.msea.2006.12.142OAI: oai:DiVA.org:kau-2023DiVA, id: diva2:5523
Tillgänglig från: 2008-04-17 Skapad: 2008-04-17 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Ingår i avhandling
1. Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders
Öppna denna publikation i ny flik eller fönster >>Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders
2008 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In powder metallurgy research field, Direct Metal Laser Sintering (DMLS) and Metal Powder Starch Consolidation (MPSC) are relatively new rapid forming techniques to fabricate complex and near net-shaped components. The working principles of DMLS are to melt and fuse metal powder layer by layer in computer controlled systems to pile up components like three dimensional printing. It has been for instance extensively used for mould inserts, die parts, and functional metal prototypes. Another, less explored method, starch consolidation is a pressureless direct casting method which consists principally of mixing powder slurry, casting into moulds, consolidation, drying, and sintering. With a strong focus on both methods, the study here combines several strong material technology sectors; powder, rapid forming, mechanical property testing and surface technology. It covers the processing chain from green body preparation, optimization of

sintering, nitriding, post sinter heat treatment, to modeling and assessment of material behaviour for end-user applications. An iron based powder and a high vanadium high speed steel powder with low and high carbon contents were used in the DMLS and MPSC processes, respectively. The overall aim of the study is to synthesize near net-shaped powder-based components, to characterize pores and microstructure, and to establish a fundamental understanding of failure mechanisms of powder based materials in bending fatigue, thermal fatigue and wear.

The study showed the DMLS and MPSC technologies could produce shaped components with a multi-phased structure, controllable nitriding depth and high relative densities in a range of 97 - 99.7 %. Materials' heterogeneity and porosity have detrimental influence on mechanical properties, especially on crack initiation and subsequent propagation.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2008. s. 57
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2008:13
Nyckelord
Powder metallurgy, Laser sintering, Microstructure, Fatigue, Thermal fatigue, Wear, Starch consolidation, Rapid forming, Net shaping, Liquid phase sintering, Nitriding, High speed steels
Nationell ämneskategori
Materialteknik
Forskningsämne
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-1593 (URN)978-91-7063-171-9 (ISBN)
Disputation
2008-04-28, Ericssonsalen, 9C 204, Karlstads universitet, Karlstad, 13:15
Handledare
Tillgänglig från: 2008-04-17 Skapad: 2008-04-17 Senast uppdaterad: 2011-12-21

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