Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: Review of Shot Peened Surface Properties
Author: David Kirk
Source: TSP Vol 21 / Issue 4, Fall 2007
Publication year 2007
Document number: 2007028
Number of pages: 4
Abstract:
DISCUSSION AND CONCLUSIONS
This account has, of necessity, involved broad generalisations about the properties of shot peened surfaces. That is because component materials vary enormously in terms of
their physical properties. Nevertheless it is felt that the general features described here are reasonable. The most important of these are that:
1) Multiple impacting invokes very high plastic strains with a maximum surface hardness being a characteristic feature.
2) The very high strain rates associated with dimple formation induce adiabatic heating that contributes to a degree of recovery of extreme-surface properties.
3) Heavily-deformed peened surfaces are thermodynamically unstable - requiring careful control of post-peening service temperatures.
4) A combination of strain-softening and surface temperature rise produces a reduction of the extreme surface compressive residual stress level.
5) Dimpling of peened surfaces can have a useful influence on high-load lubrication regimes.
There is a temptation to apply the principle of "more is better" in commercial shot peening. This is contrary to evolving knowledge that indicates that optimum service
properties are developed by applying coverage that is nearer to the nominal 100% than, say, 300%.
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