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Thermal fatigue behaviour of an iron-based laser sintered material
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.ORCID-id: 0000-0001-6029-2613
Karlstads universitet, Fakulteten för teknik- och naturvetenskap, Avdelningen för maskin- och materialteknik.
2009 (engelsk)Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 513-514, s. 67-71Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Direct metal laser sintering is a rapid manufacturing technique to make intricate and near net-shaped parts. An iron-based laser sintered metal was studied to evaluate its thermal fatigue properties. The test was performed using cylindrical specimens in a high power induction heating system equipped with a laser strain gauge for a contactless surface strain measurement. Initiation of thermal fatigue cracks occurred preferentially at pores and layer interfaces, while propagation of cracks followed along phase boundaries and thin inter-dendritic phases and showed an inter-granular fracture. By using the fundamental Fourier equation for heat conduction, the temperature cycle was modeled and calculated. A thermo elastic ideal plastic model was used to deduce the thermal stress based on surface strain experimentally measured. Finally, the temperature distribution, thermal stresses and mechanical strains were discussed with respect to thermal fatigue damage.

sted, utgiver, år, opplag, sider
2009. Vol. 513-514, s. 67-71
Emneord [en]
Laser sintered metal, Thermal fatigue, Thermal crack initiation and propagation, Thermal stress, Strain
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-2019DOI: 10.1016/j.msea.2009.01.053OAI: oai:DiVA.org:kau-2019DiVA, id: diva2:5519
Tilgjengelig fra: 2008-04-17 Laget: 2008-04-17 Sist oppdatert: 2017-12-07bibliografisk kontrollert
Inngår i avhandling
1. Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders
Åpne denne publikasjonen i ny fane eller vindu >>Mechanical properties and microstructure of laser sintered and starch consolidated iron-based powders
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2008. s. 57
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2008:13
Emneord
Powder metallurgy, Laser sintering, Microstructure, Fatigue, Thermal fatigue, Wear, Starch consolidation, Rapid forming, Net shaping, Liquid phase sintering, Nitriding, High speed steels
HSV kategori
Forskningsprogram
Materialteknik
Identifikatorer
urn:nbn:se:kau:diva-1593 (URN)978-91-7063-171-9 (ISBN)
Disputas
2008-04-28, Ericssonsalen, 9C 204, Karlstads universitet, Karlstad, 13:15
Veileder
Tilgjengelig fra: 2008-04-17 Laget: 2008-04-17 Sist oppdatert: 2011-12-21

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