NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Effect of multiple strain-anneal cycles on the 1000 C creep behaviour of gamma/gamma prime-alphaVarious multiple strain-anneal cycles (1000 C) were imposed on specimens of the directionally solidified eutectic (DSE) alloy gamma/gamma prime-alpha to identify thermomechanical processing methods (TMP) which would improve the creep behavior. Specimens of the Ni-32.3Mo-6.3Al wt pct alloy were grown with a modified Bridgeman technique. Some of the cylindrical specimens were alternately heat-treated at 900 C, then strained, or heat-treated only, while other specimens were annealed at 900 C after swaging and then worked at ambient temperature. The specimens were all examined microstructurally using transmission electron microscopy, some before and after being exposed to constant-load compression tests at 1000 C. The creep strain increased for all TMP specimens for strain rates of at least 2 millionths per sec. Strain rates of about 2 ten millionths per sec were only improved with strain annealing with 13 percent work at ambient temperature. A slight improvement, compared to as-grown materials, was observed in the 1000 C creep behavior of materials annealed at 900 C. Strain-annealing was found to introduce three-dimensional dislocation networks into the gamma-prime matrix.
Document ID
19860045872
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Whittenberger, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Buzek, B. C.
(NASA Lewis Research Center Cleveland, OH, United States)
Wirth, G.
(DFVLR Cologne, Germany)
Date Acquired
August 12, 2013
Publication Date
March 1, 1986
Publication Information
Publication: Journal of Materials Science
Volume: 21
ISSN: 0022-2461
Subject Category
Metallic Materials
Accession Number
86A30610
Distribution Limits
Public
Copyright
Other

Available Downloads

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