NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Elevated temperature creep-rupture behavior of the single crystal nickel-base superalloy NASAIR 100The creep and rupture behavior of 001-line-oriented single crystals of the nickel-base superalloy NASAIR 100 was investigated at temperatures of 925 and 1000 C. In the stress and temperature ranges studied, the steady state creep rate, time to failure, time to the onset of secondary creep, and the time to the onset of tertiary creep all exhibited power law dependencies on the applied stress. The creep rate exponents for this alloy were between seven and eight, and the modulus-corrected activation energy for creep was approximately 350 kjoule/mole, which was comparable to the measured activation energy for Ostwald ripening of the gamma-prime precipitates. Oriented gamma-prime coarsening to form lamellae perpendicular to the applied stress was very prominent during creep. At 1000 C, the formation of a continuous gamma-gamma-prime lamellar structure was completed during the primary creep stage. Shear through the gamma-gamma-prime interface is considerd to be the rate limiting step in the deformation process. Gradual thickening of the lamellae appeared to be the cause of the onset of tertiary creep. At 925 C, the fully developed lamellar structure was not achieved until the secondary or tertiary creep stages. At this temperature, the gamma-gamma-prime lamellar structure did not appear to be as beneficial for creep resistance as at the higher temperature.
Document ID
19850045661
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nathal, M. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Ebert, L. J.
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 16A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
85A27812
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available