NDLI: Effects of fine porosity on the fatigue behavior of a powder metallurgy superalloy

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Effects of fine porosity on the fatigue behavior of a powder metallurgy superalloy

Content Provider	NASA Technical Reports Server (NTRS)
Author	Miner Jr., R. V. Dreshfield, R. L.
Copyright Year	1980
Description	Hot isostatically pressed powder metallurgy Astroloy was obtained which contained 1.4 percent fine 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 previous data on sound Astroloy. The pores averaged about 2 micrometers diameter and 20 micrometers spacing. They did influence fatigue crack initiation and produced a more intergranular mode of propagation. However, fatigue life was not drastically reduced. A large 25 micrometers pore in one specimen resulting from a hollow particle did not reduce life by 60 percent. 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 little changed reflecting the small reduction in sigma sub u/E for the porous material.
File Size	2219636
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800013007
Archival Resource Key	ark:/13960/t7dr7nv93
Language	English
Publisher Date	1980-01-01
Access Restriction	Open
Subject Keyword	Metallic Materials Metal Fatigue Fatigue Life Creep Properties Porous Materials Heat Resistant Alloys Porosity Powder Metallurgy Turbine Engines Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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