What's the difference between shot blasting and shoot peening?

zluu22

What's the difference between shot blasting and shoot peening?

magicmotor

Check these two terminology from Wikipedia.
For shot blasting: Abrasive blasting(redirect from shot blasting) is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface, or remove surface contaminants. A pressurized fluid, typically air, or a centrifugal wheel is used to propel the blasting material (often called the media). The first abrasive blasting process was patented by Benjamin Chew Tilghman on 18 October 1870.[1]

There are several variants of the process, such as bead blasting, sand blasting, sodablasting, and shot blasting.
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For shot Peening. Shot peening is a cold working process used to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass, or ceramic particles) with force sufficient to create plastic deformation.[1][2]

It is similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion: each particle functions as a ball-peen hammer. In practice, this means that less material is removed by the process, and less dust created.
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So, generally, shot blasting will be focused on cleaning/abrasion, but for shot peening, it will focus on plastic deformation to form a residual stress.

Thank you Zluu22, you raised a good question, and I learned a lot.

zluu22

Thank you very much!