Heat Treatment

 

   

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Cryogenic Treatment
( Sub-Zero )

It is a popular technique as a secondary process to follow the heat-treatment.
Sub-zero treatment process assist in transformation of retained austenite into martensite and/or the precipitation of newly formed carbides
Best results are seen in tool steels and high carbon steels (wear improvements 3~5 times due to high amount of
retained austenite.
Advantage of Sub-zero Treatment :
Improve stress relief
Better dimensional stability
More uniform structural stability
Improve wear resistance
 
What happens to Cryo-Processed materials?
Increases abrasive wear resistance.
Requires only one permanent treatment.
Creates a denser molecular structure. The result is a larger      contact surface area that reduces friction, heat and wear.
Changes the equipment's entire structure, not just the     surface. Subsequent refinishing operations or re-grinds do     not affect permanent improvements.
Eliminates thermal shock through a dry, computer     controlled process.
Forms microfine carbide fillers to enhance large
    carbide structures.
Increases durability or wear life.
Decreases residual stresses in tool steels.
Decreases brittleness.
Increases tensile strength, toughness and stability coupled     with the release of internal stresses.
These two images show steel before and after Cryo-Processing
                    

 

 
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