Shot Peening Materials Science
Author: Dr. David Kirk | Coventry University
Source: The Shot Peener magazine, Vol 37, Issue 2, Spring 2023
Doc ID: 2023018
Year of Publication: 2023
Abstract:
INTRODUCTION
The most important question in the Universe is probably
“Why?” For shot peening it applies to the several materials
that are at the heart of the process. For example, “Why is
steel shot so commonly used?”. Materials science covers all
of the materials used in shot peening—metals, ceramics and
polymers. This article attempts to provide answers to why
particular materials are selected for shot peening applications.
SHOT PARTICLES
The ideal shape for a shot particle is a sphere, but real shot
particles are not perfect spheres. The most commonly
employed media are cast steel and iron shot, cut steel wire
shot, glass beads and ceramic beads. These media are
manufactured either by spheroidizing solid particles (cut
steel wire and some glass beads) or by direct production of
near-spherical shapes. Because of the method of manufacture,
variations from sphericity are inevitable.
Cast Shot
Steel, cast iron and glass shot particles are produced by
liquefying the material and then dispersing it as fine particles
that solidify as they cool. The controlling factor affecting
shape in these particles is surface tension. Surface tension
is present in both liquid and solid particles, but reveals itself
more dramatically for the liquid state.
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