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Fractographic Analysis of 60-Nitinol Bearing RacesFracture surfaces on a failed bearing race made from 60-Nitinol (60 wt% Ni - 40 wt% Ti) were analyzed. The bearing had experienced excessive localized heat due to an issue during machining that may have resulted in dimensional distortion. However, the classical fracture features that were identified by scanning electron microscopy and the fracture origins coincided with high concentrations of TiC-based contamination. Lessons learned for processing and quality control are discussed. An attempt to use x-ray diffraction to directly measure residual stresses imparted from the required heat treatment is also discussed.
Document ID
20180006435
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Stanford, Malcolm K. (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
October 18, 2018
Publication Date
August 1, 2018
Subject Category
Metals And Metallic Materials
Report/Patent Number
GRC-E-DAA-TN54688
E-19522
NASA/TM-2018-219905
Funding Number(s)
WBS: WBS 109492.02.03.02.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
intermetallics
fractography
x-ray diffraction

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