Peening

The mechanical working of metals by means of hammer blows. Peening tends to stretch the surface of the cold metal, thereby relieving contraction stresses.
Found on http://www.diracdelta.co.uk/science/source/p/e/peening/source.html

Peening

A stream of sharp material particles which break superficial fibres, reducing internal stress fields.
Found on http://www.poeton.co.uk/w1/glossary.htm

Peening

The stretching of metal by hammering or rolling the surface.
Found on http://www.encyclo.co.uk/local/21038

Peening

A technique of blasting the surface of metal with shot. Improves appearance and hardens the surface.
Found on http://www.metalbulletin.com/Glossary.html

Peening

Peening is the process of working a metal`s surface to improve its material properties, usually by mechanical means such as hammer blows, by blasting with shot (shot peening), or blasts of light beams with laser peening. Peening is normally a cold work process (laser peening being a notable exception{Citation needed|date=January 2011}). It tends ....
Found on http://en.wikipedia.org/wiki/Peening

Peening

A technique of blasting the surface of metal with shot. Improves appearance and hardens the surface.
Found on http://www.metalbulletin.com/Glossary.html
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