Experimental Investigation of Shot Peening on Case
Author: E. Nordin, B. Alfredsson
Source: Exp Tech, DOI 10.1007/s40799-017-0183-4
Doc ID: 2017149
Year of Publication: 2017
Abstract:
Shot peening is a manufacturing process commonly
used to increase fatigue life in components for the
automotive and aircraft industry. In this paper the effect of
shot peening is described for a case hardened gear steel.
For gears there are three main factors from shot peening
that influence fatigue life: residual stresses, microstructure
and surface roughness. The paper describes an experimental
series where these parameters were measured for common
industrial shot peening settings. The aim was to show how
several different measurement techniques and results correspond
to each other for certain shot peening parameters. The
aim was also to gather experimental results that can be used
for verification of shot peening simulations. To simplify
measurements and decrease variation, flat steel plates were
used as targets. Residual stress, full width at half maximum
(FWHM), retained austenite, surface roughness/topology,
hardness and Barkhausen noise were measured and related
to microstructural changes. The mean indentation diameter
was measured for individual shots at low coverage of each
intensity which was used to determine the average velocity
of the media. The mean diameter and hardness of the shot
peening media was also determined.
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