SYMPOSIA PAPER Published: 01 January 1966

Microstructural Alterations in Rolling Contact Fatigue


Stress-induced, structurally altered regions of ball and roller bearings were examined by transmission electron microscopy. The sectioning procedure is described in detail. A dark-etched region on roller bearings of carburized 4620 steel contained banded areas which had little in common with the microstructure of the martensite elsewhere. These lined-up areas ranged from a few to ten square microns. Electron diffraction patterns of the deformed areas exhibit arcing, but it is uncertain whether these regions give a distinctive pattern. Electron micrographs indicate that light-etched areas on 52100 steel ball bearings have a structure similar to the dark-etched regions on the other bearings. Observable precipitates do not form at tempering temperatures below 900 F. Electron diffraction patterns do not have spots which identify these microbands. X-ray studies, currently in progress, should indicate whether or not the microbands have a preferred orientation.

Author Information

King, A., H.
Arthur D. Little, Inc., Cambridge, Mass.
O'Brien, J., L.
Arthur D. Little, Inc., Cambridge, Mass.
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E04
Pages: 74–88
DOI: 10.1520/STP46420S
ISBN-EB: 978-0-8031-6799-5
ISBN-13: 978-0-8031-6623-3