About: Study of Pinholes Genesis in Iron Castings

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The study concerns the formation of pinholes in castings formed by reaction between a green foundry mould and lamellar graphite cast iron. Experiments were done on castings of stepped bars moulded in green bentonite mixtures with s graduated moisture and with use of two types of carbonaceous matters. Metal was melted in a 100 kg induction furnace from the same charge. Inoculation was done in a ladle after pouring out from the furnace.Aluminium was dosed in the ladle in some cases and the inoculator kind was changed too. Results: Pinholes were present on castings as small flat pits; on horizontal surfaces sooner singly, on casting edges in clusters. The formation of pinholes wasn’t caused by high moisture of moulds but the defect was sensitive to aluminium content in metal. In castings with high aluminium content > 0.01 % the pinholes were present in great numbers, and namely both under low, and also high moistures of moulding mixtures. In melts with low content of Al < 0.01 % the pinholes occurred less extensively only. Conclusions from literature about influence of Al on pinholes occurrence were confirmed in such a way. Study of the defect morphology has shown that the question is a oxidation reaction type of pinholes caused by oxidation of the residual melt between dendrites with formation of CO. The study concerns the formation of pinholes in castings formed by reaction between a green foundry mould and lamellar graphite cast iron. Experiments were done on castings of stepped bars moulded in green bentonite mixtures with s graduated moisture and with use of two types of carbonaceous matters. Metal was melted in a 100 kg induction furnace from the same charge. Inoculation was done in a ladle after pouring out from the furnace.Aluminium was dosed in the ladle in some cases and the inoculator kind was changed too. Results: Pinholes were present on castings as small flat pits; on horizontal surfaces sooner singly, on casting edges in clusters. The formation of pinholes wasn’t caused by high moisture of moulds but the defect was sensitive to aluminium content in metal. In castings with high aluminium content > 0.01 % the pinholes were present in great numbers, and namely both under low, and also high moistures of moulding mixtures. In melts with low content of Al < 0.01 % the pinholes occurred less extensively only. Conclusions from literature about influence of Al on pinholes occurrence were confirmed in such a way. Study of the defect morphology has shown that the question is a oxidation reaction type of pinholes caused by oxidation of the residual melt between dendrites with formation of CO. (en)
Title	Study of Pinholes Genesis in Iron Castings Study of Pinholes Genesis in Iron Castings (en)
skos:prefLabel	Study of Pinholes Genesis in Iron Castings Study of Pinholes Genesis in Iron Castings (en)
skos:notation	RIV/61989100:27360/11:86081000!RIV12-GA0-27360___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GA106/08/0789)
http://linked.open...iv/cisloPeriodika	1/2011
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Elbel, Tomáš Hampl, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola báňská - Technická univerzita Ostrava / Fakulta metalurgie a materiálového inženýrství
http://linked.open...dnocenehoVysledku	233097
http://linked.open...ai/riv/idVysledku	RIV/61989100:27360/11:86081000
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Cast iron; Pinholes; Casting Defect (en)
http://linked.open.../riv/klicoveSlovo	Casting Defect Pinholes Cast iron
http://linked.open...odStatuVydavatele	PL - Polská republika
http://linked.open...ontrolniKodProRIV	[2B7BF064AA38]
http://linked.open...i/riv/nazevZdroje	ARCHIVES of FOUNDRY ENGINEERING
http://linked.open...in/vavai/riv/obor	JG
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Graphite nucleation and possibilities of its morphology control in ferrous alloys
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	11
http://linked.open...iv/tvurceVysledku	Hampl, Jiří Elbel, Tomáš Šenkypl, Martin
issn	1897-3310
number of pages	8 (xsd:int)
http://localhost/t...ganizacniJednotka	27360

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