Yes, after post-heating the part once the weld/peen procedure is done, burying it in a pile of DRY sand helps it to cool slowly. Putting it in the kids' sandbox after a rain might not be the best idea!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!