NDLI: Effect of environmental exposures on fatigue life of p/m disk superalloys

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Effect of environmental exposures on fatigue life of p/m disk superalloys

Content Provider	NASA Technical Reports Server (NTRS)
Author	Draper, Susan
Copyright Year	2011
Description	As the temperature capability of Ni-base superalloy powder metallurgy disks is steadily increased, environmental resistance and protection of advanced nickel-based turbine disk components are becoming increasingly important. Localized surface hot corrosion attack and damage from oxidation have been shown to impair disk fatigue life and may eventually limit disk operating temperatures. NASA Research Announcement (NRA) contracts have been awarded to GE Aviation and Honeywell Aerospace to separately develop fatigue resistant metallic and ceramic coatings for corrosion resistance and the corrosion/fatigue results of selected coatings will be presented. The microstructural response of a bare ME3 disk superalloy has been evaluated for moderate (704 C) and aggressive (760-816 C) oxidizing exposures up to 2,020 hours. Cross section analysis reveals sub-surface damage (significant for aggressive exposures) that consists of Al2O3 "fingers", interfacial voids, a recrystallized precipitate-free layer and GB carbide dissolution. The effects of a Nichrome corrosion coating on this microstructural response will also be presented.
File Size	21324656
Page Count	30
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110014467
Archival Resource Key	ark:/13960/t3hx6b850
Language	English
Publisher Date	2011-05-10
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Corrosion Resistance Fatigue Life Nickel Alloys Ceramic Coatings Heat Resistant Alloys Oxidation Environment Protection Exposure Powder Metallurgy Microstructure Damage Precipitates Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Presentation

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