1. 
   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 op http://www.diracdelta.co.uk/science/source/p/e/peening/source.html
   
   
2. 
   Peening
   A stream of sharp material particles which break superficial fibres, reducing internal stress fields.
   Found op http://www.poeton.co.uk/w1/glossary.htm
   
   
3. 
   Peening
   Peening is the process of working a metal`s surface to improve its material properties, usually by mechanical means such as hammer blows or by blasting with shot (shot peening). Peening is normally a cold work process (laser peening being a notable exception{Citation needed|date=January 2011}). It ...
   Found op http://en.wikipedia.org/wiki/Peening
   
   
4. 
   Peening
   The stretching of metal by hammering or rolling the surface.
   Found op http://www.encyclo.co.uk/local/21038
   
   
5. 
   Peening
   A technique of blasting the surface of metal with shot. Improves appearance and hardens the surface.
   Found op http://www.metalbulletin.com/Glossary.html
   
   
6. 
   peening
   1) Pounding, in a way
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/peening/1
   
   

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