NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Retention of Compressive Residual Stresses Introduced by Shot Peening in a Powder Metal Disk SuperalloyThe fatigue lives of disk superalloys can be increased by shot peening their surfaces, to induce compressive residual stresses near the surface that impede cracking there. As disk application temperatures increase for improved efficiency, the persistence of these beneficial stresses could be impaired, especially with continued fatigue cycling. The objective of this work was to study the retention of residual stresses introduced by shot peening, when subjected to fatigue and high temperatures. Fatigue specimens of powder metallurgy processed nickel-base disk superalloy ME3 were prepared with consistent processing and heat treatment. They were then shot peened using varied conditions. Strain-controlled fatigue cycles were run at room temperature and 704 C, to allow re-assessment of residual stresses.
Document ID
20160014557
Document Type
Technical Memorandum (TM)
Authors
Gabb, Timothy P. (NASA Glenn Research Center Cleveland, OH United States)
Danetti, Andrew (Buffalo Univ. NY, United States)
Draper, Susan L. (NASA Glenn Research Center Cleveland, OH United States)
Locci, Ivan E. (Toledo Univ. Toledo, OH, United States)
Telesman, Jack (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
December 9, 2016
Publication Date
December 1, 2016
Subject Category
Metals and Metallic Materials
Structural Mechanics
Report/Patent Number
NASA/TM-2016-219414
E-19311
GRC-E-DAA-TN36362
Funding Number(s)
WBS: WBS 081876.02.03.04.02.01
CONTRACT_GRANT: NNC13BA10B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
fatigue
superalloy
disk
Shot peening

Available Downloads

NameType 20160014557.pdf STI