Introducing Gradient Severe Shot Peening as a Novel Mechanical Surface Treatment
Author: Electronics Inc. | www.electronics-inc.com
Source: The Shot Peener magazine, Vol 38, Issue 1, Winter 2024
Doc ID: 2024005
Year of Publication: 2024
Abstract:
SHOT PEENING is widely used for improving
mechanical properties especially fatigue behavior of metallic
components by inducing surface hardening, compressive
residual stresses and surface grain refinement. In air blast
shot peening, projection pressure and surface coverage (an
index of peening duration) have been considered as major
controlling process parameters; the combination of these
parameters plays a critical role in the beneficial effects of shot
peening. Generally in severe shot peening aimed at obtaining
surface grain refinement, constant values of pressure are
considered with different peening durations.
Considering very high peening duration, however, the
phenomenon of over shot peening, which can be identified
with the formation of surface defects could occur. The
present study introduces a novel shot peening treatment,
here called gradient severe shot peening (GSSP) that instead
of using constant projection pressure, implements gradually
increasing or decreasing pressures. The gradual increase of
the projection pressure acts as a pre-hardening stage for the
following higher projection pressure boosting the potential
of the material to tolerate the sequential impacts and thus
become less prone to the formation of surface defects.
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