Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Effect Of Shot Peening On The Pitting Fatigue Strength Of Carburized Gears
Author: Kobayashi, M. and Hasegawa, K.
Source: Conf Proc: ICSP-4, (p.465-476)
Publication year 1990
Document number: 1990027
Number of pages: 11
Abstract:
There are many reports to indicate that shot peening is a valid means to improve the bending strength of gear teeth, but there are only a limited number of reports on its
effect on pitting fatigue strength and its mechanism is yet to be understood clearly.
T
he authors investigated the conditions under which pitting of truck and
bus transmission gears occurs and conducted a roller pitting fatigue test and a gear pitting fatigue test using spur gears in order to evaluate the effects of shot peening
on the pitting fatigue strength of carburized gears.
T
he findings obtained from the tests are listed below:
(
1) Pitting of carburized gears originates from the intergranular
oxidation area on the surface produced by carburizing.
(
2) Shot-peened gears excel in both fatigue limit and fatigue life.
(
3) Electron microscopy of the sliding surfaces indicated that the
residual compressive stress, which develops as a result of shot peening, works to suppress opening (cracking) of the intergranular oxidation layer under the Hertz's contact
pressure and consequently improves the pitting fatigue strength.
Descriptors: Shot peening; Carburized gear; Residual stress; Pitting fatigue
Download full text pdf file
www.shotpeener.com
This page last revised: 04/24/2008