Publication detail
Investment casting of near-gamma TiAl intermetallic alloys
ZEMČÍK, L. DLOUHÝ, A. DOČEKALOVÁ, K.
Czech title
Přesné lití intermetalických slitin gama TiAl
English title
Investment casting of near-gamma TiAl intermetallic alloys
Type
conference paper
Language
en
Original abstract
The paper deals with physical and chemical analyses of the evaporation of aluminium from a TiAl melt, with reactions between the melt and the refractories of crucibles, and with reactions between the melt and residual gases in the vacuum furnace chamber. The present study introduces a 1D model of the heat flow in a system composed of a TiAl intermetallic casting, a ceramic shell mould and the vacuum furnace environment. Furthermore, a 1D model of the thermal strain in the casting-mould system during cooling to room temperature is also presented. The parametric study aimed at minimizing thermal stresses provided the optimum initial mould temperatures and cooling kinetics of the system mould-TiAl castings resulted in macroscopically sound castings that were free of macrocracks.
Czech abstract
Práce obsahuje fyzikálně chemickou analýzu vypařování hliníku z roztavené slitiny TiAl a analýzu reakcí s žáruvzdorninami kelímků, keramických forem a s atmosférou vakuové pece. V práci je dále uveden 1D model vedení tepla v soustavě odlitek TiAl – keramická skořepina a na něj navazující 1D model vzniku napjatosti v odlitku. Vytvořené modely umožňují optimalizaci základních licích parametrů (počáteční teplota formy, licí teplota, režim ochlazování odlitků) poskytujících minimální napětí v odlitku během ochlazování a získání odlitků bez prasklin.
English abstract
The paper deals with physical and chemical analyses of the evaporation of aluminium from a TiAl melt, with reactions between the melt and the refractories of crucibles, and with reactions between the melt and residual gases in the vacuum furnace chamber. The present study introduces a 1D model of the heat flow in a system composed of a TiAl intermetallic casting, a ceramic shell mould and the vacuum furnace environment. Furthermore, a 1D model of the thermal strain in the casting-mould system during cooling to room temperature is also presented. The parametric study aimed at minimizing thermal stresses provided the optimum initial mould temperatures and cooling kinetics of the system mould-TiAl castings resulted in macroscopically sound castings that were free of macrocracks.
Keywords in Czech
intermetalické slitiny gama TiAl, vakuové indukční tavení, přesné lití
Keywords in English
gamma TiAl intermetallic alloys, vacuum induction melting, investment casting
RIV year
2007
Released
03.09.2007
Publisher
Société Francaise de Metallurgie et des Matériaux
Location
Paris
Book
Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting
Pages from–to
213–218
Pages count
6
BIBTEX
@inproceedings{BUT23753,
author="Ladislav {Zemčík} and Antonín {Dlouhý} and Kateřina {Dočekalová},
title="Investment casting of near-gamma TiAl intermetallic alloys",
booktitle="Proceedings of the 2007 International Symposium on Liquid Metal Processing and Casting",
year="2007",
month="September",
pages="213--218",
publisher="Société Francaise de Metallurgie et des Matériaux",
address="Paris"
}