Selective Laser Sintering and Post Processing of Fully Ferrous Components

dc.creatorVallabhajosyula, Phani
dc.creatorBourell, David L.
dc.date.accessioned2020-03-11T14:33:48Z
dc.date.available2020-03-11T14:33:48Z
dc.date.issued2008-09-10
dc.description.abstractCommercially available steel for indirect SLS (LaserFormtm A6 tool steel) is normally post-process infiltrated with a copper-based material. While such parts have high thermal conductivity necessary for short- and medium-run injection molding dies, they are weakened by the second phase with limited high temperature stability. This paper deals with a modification to the commercial process whereby a low-melting-point cast iron is substituted for the copper alloy infiltrant. A predictive model is presented that describes the part equilibrium solid fraction at the infiltration temperature as a function of the green density and infiltration temperature. In an experimental study, green parts were fabricated using LaserFormtm A6 tool steel powder. They were then heated in vacuum to drive off the binder and infiltrated with ASTM A532 white cast iron. During infiltration, an equilibrium state is established between the solid SLS steel part and liquid cast iron associated primarily with carbon diffusion from the cast iron into the tool steel. The equilibrium state is governed by the carbon content of the steel and cast iron, the relative density of the steel part prior to infiltration and the infiltration temperature. In some cases guided by Ashby densification maps, pre-sintering of the tool steel green part was performed to increase the initial relative density of the solid metal.en_US
dc.description.departmentMechanical Engineeringen_US
dc.identifier.urihttps://hdl.handle.net/2152/80244
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/7263
dc.language.isoengen_US
dc.relation.ispartof2008 International Solid Freeform Fabrication Symposiumen_US
dc.rights.restrictionOpenen_US
dc.subjectselective laser sinteringen_US
dc.titleSelective Laser Sintering and Post Processing of Fully Ferrous Componentsen_US
dc.typeConference paperen_US

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