Publication detail
Vacuum induction melting and investment casting technologies tailored to near-gamma TiAl alloys
DLOUHÝ, A. DOČEKALOVÁ, K. ZEMČÍK, L.
Czech title
Technologie vakuového tavení a přesného lití uzpůsobená pro slitiny gama TiAl
English title
Vacuum induction melting and investment casting technologies tailored to near-gamma TiAl alloys
Type
journal article - other
Language
en
Original abstract
The present study focuses on vacuum induction melting and investment casting of gamma TiAl intermetallic alloys. The attention is mainly given to a cost-effective melting process in which a primary alloy ingot is re-melted in a ceramic crucible and cast into a ceramic shell mould. 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 se zabývá vakuovým tavením a přesným litím slitin gama TiAl. Pozornost je věnována zejména cenově přijatelným procesům tavení v keramických kelímcích s následným odléváním do keramických forem. 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.
English abstract
The present study focuses on vacuum induction melting and investment casting of gamma TiAl intermetallic alloys. The attention is mainly given to a cost-effective melting process in which a primary alloy ingot is re-melted in a ceramic crucible and cast into a ceramic shell mould. 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
Intermetalika, Vakuové indukční tavení, Přesné lití
Keywords in English
Intermetallics, Gamma TiAl, Vacuum Induction Melting, Investment Casting
RIV year
2007
Released
15.03.2007
Publisher
Trans Tech Publication Ltd
Location
Switzerland
ISSN
0255-5476
Journal
Materials Science Forum
Volume
2007
Number
539-543
Pages from–to
1463–1468
Pages count
6
BIBTEX
@article{BUT44485,
author="Antonín {Dlouhý} and Kateřina {Dočekalová} and Ladislav {Zemčík},
title="Vacuum induction melting and investment casting technologies tailored to near-gamma TiAl alloys",
journal="Materials Science Forum",
year="2007",
volume="2007",
number="539-543",
month="March",
pages="1463--1468",
publisher="Trans Tech Publication Ltd",
address="Switzerland",
issn="0255-5476"
}