Record Details

Record 1 of 1
Fatigue Failure Modes of the Grain Size Transition Zone in a Dual Microstructure Disk
NTRS Full-Text: Click to View  [PDF Size: 1017 KB]
Author and Affiliation:
Gabb, Timothy P.(NASA Glenn Research Center, Cleveland, OH, United States);
Kantzos, Pete T.(Honeybeen Engine Systems, Phoenix, AZ, United States);
Palsa, Bonnie(NASA Glenn Research Center, Cleveland, OH, United States);
Telesman, Jack(NASA Glenn Research Center, Cleveland, OH, United States);
Gayda, John(NASA Glenn Research Center, Cleveland, OH, United States);
Sudbrack, Chantal K.(NASA Glenn Research Center, Cleveland, OH, United States)
Abstract: Mechanical property requirements vary with location in nickel-based superalloy disks. In order to maximize the associated mechanical properties, heat treatment methods have been developed for producing tailored grain microstructures. In this study, fatigue failure modes of a grain size transition zone in a dual microstructure disk were evaluated. A specialized heat treatment method was applied to produce varying grain microstructure in the bore to rim portions of a powder metallurgy processed nickel-based superalloy disk. The transition in grain size was concentrated in a zone of the disk web, between the bore and rim. Specimens were extracted parallel and transversely across this transition zone, and multiple fatigue tests were performed at 427 C and 704 C. Grain size distributions were characterized in the specimens, and related to operative failure initiation modes. Mean fatigue life decreased with increasing maximum grain size, going out through the transition zone. The scatter in limited tests of replicates was comparable for failures of uniform gage specimens in all transition zone locations examined.
Publication Date: Sep 09, 2012
Document ID:
20130000421
(Acquired Jan 07, 2013)
Subject Category: METALS AND METALLIC MATERIALS
Report/Patent Number: E-18471
Document Type: Conference Paper
Meeting Information: International Symposium on Superalloys 2012; 9-13 Sep. 2012; Champion, PA; United States
Contract/Grant/Task Num: WBS 561581.02.08.03.15.14
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: NASA Glenn Research Center; Cleveland, OH, United States
Description: 10p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: FAILURE MODES; FATIGUE LIFE; GRAIN SIZE; HEAT RESISTANT ALLOYS; NICKEL ALLOYS; MICROSTRUCTURE; MECHANICAL PROPERTIES; FATIGUE TESTS; POWDER METALLURGY; HEAT TREATMENT
Miscellaneous Notes: to appear in International Journal of Fatigue
› Back to Top
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed
Find Similar Records
 
NASA Logo, External Link

NASA Official: Gerald Steeman

Sponsored By: NASA Scientific and Technical Information Program

Site Curator: STI Support Services

Last Modified: April 09, 2013

Privacy Policy & Important Notices Disclaimers, Copyright, Terms of Use Freedom of Information Act USA.gov NASA.gov NASA OCIO Free Adobe PDF Reader Free MS Word Viewer