NDLI: Effects of long term exposures on pm disk superalloys

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Effects of long term exposures on pm disk superalloys

Content Provider	NASA Technical Reports Server (NTRS)
Author	Draper, S. L. MacKay, R. A. Sudbrack, C. K. Telesman, J. Gabb, T. P.
Copyright Year	2013
Description	Turbine disks in some advanced engine applications may be exposed to temperatures above 700 C for extended periods of time, approaching 1,000 h. These exposures could affect the near-surface composition and microstructure through formation of damaged and often embrittled layers. The creation of such damaged layers could significantly affect local mechanical properties. Powder metal disk superalloys LSHR and ME3 were exposed at temperatures of 704, 760, and 815 C for times up to 2,020 h, and the types and depths of environmental attacked were measured. Fatigue tests were performed for selected cases at 704 and 760 C, to determine the impact of these exposures on fatigue life. Fatigue resistance was reduced up to 98% in both superalloys for some exposure conditions. Tensile tests were also performed to help understand fatigue responses, and showed corresponding reductions in ductility. The changes in surface composition and phases, depths of these changed layers, failure responses, and failure initiation modes were compared.
File Size	7157533
Page Count	62
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20140013081
Archival Resource Key	ark:/13960/t0vq7xv19
Language	English
Publisher Date	2013-12-01
Access Restriction	Open
Subject Keyword	Heat Resistant Allos Fatigue(materials) Oxidation Fatigue Tests Gas Turbines Nickel Alloys Metal Powder Ductility Heat Resistant Alloys Fatigue Materials Tensile Tests High Temperature Tests Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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