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"
}