Investment casting of {gamma}-TiAl-based alloys: Microstructure and data base for gas turbine applications

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:225112

Wagner, R; Appel, F; Dogan, B ^[1]

---

1. GKSS Research Center, Geesthacht (Germany). Inst. for Materials Research; and others

Investment casting is regarded as an economic processing technology for the production of {gamma}-TiAl based components for gas turbine applications. Near net-shape parts can be cast such that they are free from pores and flaws after adequate `HIP`ping. The inhomogeneous cast microstructure which results from locally varying cooling rates (e.g. in the root and foil of a blade), however, is often retained even after heat-treatments necessary to achieve a balance of properties for a given application. Appropriate modifications of the alloy chemistry may lead to an improved microstructural homogeneity in the cast parts. Data bases of properties (tensile properties, creep, fatigue and rupture strength, fracture and impact toughness, oxidation and corrosion resistance) which are relevant for potential gas turbine applications have been assessed for different cast {gamma}-TiAl alloys with different microstructures. These are compared with corresponding properties of nickel-based and iron-based superalloys {gamma}-TiAl is competing with for substitution.

• OSTI ID: 225112
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CASTING
CHROMIUM ALLOYS
CORROSION
CRACK PROPAGATION
CREEP
FRACTURE PROPERTIES
GAS TURBINES
HEAT TREATMENTS
HOT PRESSING
IMPACT STRENGTH
INTERMETALLIC COMPOUNDS
LAMELLAE
MECHANICAL PROPERTIES
MICROHARDNESS
MICROSTRUCTURE
OXIDATION
PRECIPITATION
TENSILE PROPERTIES
TITANIUM ALLOYS
TURBINE BLADES
X-RAY RADIOGRAPHY