Many racers have tried this method by applying with dry ice to heat treatment approximately -120°F to change molecular structure of metal..
It is at cryogenic temperatures (-300°F) that the molecule change, making all the retained austenite turn to marstensite, a more dense, refined mix that is smaller and more uniform than austensite..
Dry cryogenic processing transforms micro-structure into stronger uniform substructure..
Source: http://www.300below.com/press/magazine-articles/short-track.html
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