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Eisengusswerkstoffe
Dokumenten-Nummer: 57867
Tagungsbeitrag
Choe, Kyeong-Hwan; Lim, Kyoung-Mook; Lee, Sang-Mok; Lee, Kyong-Whoan
Publikationssprache: Englisch
The Effect of Vanadium and Chromium on the Precipitation of Carbide in Si-Mo Ferritic Ductile Cast
Iron
Einfluss von Vanadium und von Chrom auf die Carbidausscheidung in ferritischem Si-Mo-Gusseisen mit Kugelgraphit
Carbide precipitation behavior in Si-Mo ferritic ductile cast iron was investigated as functions of vanadium and
chromium contents. Vanadium addition promoted the precipitation of carbides both in ferrite grains and at its grain
boundaries. Pearlite was found to form near the cell boundary next to the eutectic carbides in the as-cast chromium
alloyed specimens, and was fully decomposed by an annealing heat treatment. Vanadium addition led to the formation
of fine precipitates, prohibiting the ferrite growth, resulting in smaller ferrite grains. The precipitate phase at grain
boundaries in vanadium alloyed specimens was identified as vanadium carbide (VC(1-x)) and the stoichiometry of the
eutectic carbide was almost same as that in Si-Mo ferritic ductile cast iron except for a higher vanadium content.
However, in the case of chromium alloyed specimen, the ratio of iron in the composition of eutectic carbide was higher
than those of Si-Mo and Si-Mo-0.5V cast irons.
Korea Institute of Industrial Technology (KITECH), Incheon, KR
Erscheinungsjahr 2010
S. S.102-107
Seiten/Bilder/Tabellen/Quellen: 6S
Eisengusswerkstoffe
Dokumenten-Nummer: 57833
Tagungsbeitrag
Publikationssprache: Englisch
Ciobanu, Ioan; Chisamera, Mihai; Munteanu, Sorin Ion; Crisan, Aurel; Riposan, Iulian; Bedo, Tibor; Lupinca, Ionel Cinca
Researches about the Determination of the Thermal Conductivity Coefficient for Silica Sand Moulds
Used in Romanian Foundries
Forschungen über die Ermittlung des Wärmeleitfähigkeitskoeffizienten für Formen aus Quarzsand verwendet in
rumänischen Gießereien
The paper presents the results of the researches regarding the determination of the thermal conductivity coefficient of
the moulds used for cast iron parts in Romanian foundries. The instantaneous values of the thermal conductivity
coefficient of the moulds are influenced by the type of materials that compose the moulding batch (sand, binder,
additional materials) their content (percentage) their characteristics (grains form and dimensions), but also by the
temperature. Many software used for casting solidification uses a mean substitutive value. This one include the effect of
heat transmission by conduction in the mould wall and the secondary processes that influence the heat transfer throw
the mould wall (burning processes of organic substances, water evaporation and re-condensation processes, mass
transport processes). The determination of this mean value in the case of casting grey cast iron parts with thickness of
20 mm is presented in the paper. A regressive method was applied. The solidification time experimentally determined
throw thermal analyses is compared with the solidification time obtained by simulation, in three points of the casting.
The value of the substitutive coefficient of thermal conductivity that assure the best closeness between the simulated
solidification time and the solidification time experimentally determined throw thermal analysis in the three points was
established.
Transilvania University of Brasov, RO; University Politehnica of Bucharest, RO; 'Eftimie Murgu' University, Resita, RO
Erscheinungsjahr 2010
S. S.312-317
Seiten/Bilder/Tabellen/Quellen: 6S
Giesserei Literaturschau