Effects of processing variables on the creep behavior of investment cast Ti-48Al-2Nb-2Cr

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225117

Keller, M M; Jones, P E; Porter, III, W J; Eylon, D ^[1]

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1. Univ. of Dayton, OH (United States)

Intermetallics based on ordered {gamma}-TiAl are being considered for the replacement of steels and nickel-based superalloys for high temperature aerospace and automotive applications. This study investigates the creep behavior of investment cast Ti-48Al-2Nb-2Cr with microstructures ranging from duplex to nearly lamellar. Constant load creep tests were conducted in air at temperatures of 650 C and 760 C and at stress levels of 104MPa, 155MPa, and 207MPa. The effects of cooling rates during casting, aluminum content, oxygen level, and microstructure on creep properties are discussed. The activation energy for creep and stress exponent are also reported.

• OSTI ID: 225117
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ACTIVATION ENERGY
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
AUTOMOBILES
CASTING
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COOLING
CREEP
EXPERIMENTAL DATA
GRAIN SIZE
HOT PRESSING
INTERMETALLIC COMPOUNDS
LAMELLAE
MATERIALS
MICROSTRUCTURE
NIOBIUM ALLOYS
STRAIN RATE
TITANIUM ALLOYS