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Effects of fine porosity on the fatigue behavior of a powder metallurgy superalloyHot-isostatically-pressed powder-metallurgy Astroloy was obtained which contained 1.4 percent porosity at the grain boundaries produced by argon entering the powder container during pressing. This material was tested at 650 C in fatigue, creep-fatigue, tension, and stress-rupture and the results compared with data on sound Astroloy. They influenced fatigue crack initiation and produced a more intergranular mode of propagation but fatigue life was not drastically reduced. Fatigue behavior of the porous material showed typical correlation with tensile behavior. The plastic strain range-life relation was reduced proportionately with the reduction in tensile ductility, but the elastic strain range-life relation was changed little.
Document ID
19800051325
Document Type
Conference Paper
Authors
Miner, R. V. (NASA Lewis Research Center Cleveland, OH, United States)
Dreshfield, R. L. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 10, 2013
Publication Date
February 1, 1980
Subject Category
METALLIC MATERIALS
Meeting Information
Metallurgical and Petroleum Engineers, Annual Meeting(Las Vegas, NV)
Distribution Limits
Public
Copyright
Other