|
| |
What is Deep Cryogenic Tempering?
Cryogenic Engineering, Inc. utilizes the process
of Deep Cryogenic Tempering. This process employs an advanced computer
controlled processing system for reliably treating materials. We utilize a dry
process where no liquid nitrogen comes in contact with the items being treated.
The cryogenic process is computer profile
controlled to within 1° Fahrenheit throughout the entire processing
cycle. Items being treated are slowly taken down to -300°F., held at that
temperature for a predetermined length of time, then depending on the item,
slowly brought up through the processing cycle to approximately +300°F. This
painstaking method eliminates the chance of thermal shock and micro cracking.
This treatment, at -300ºF for an extended period
of time in a dry atmosphere changes the material's microstructure. Retained
austenite (a soft form of iron) is transformed into hard martensite. A second
result of the deep cryogenic "soak" is the formation of fine carbide
particles, called binders, which are released and distributed evenly through the
mass of material to compliment the larger carbide particles present before the
cryogenic process. These smaller carbide particles help to support the
martensite matrix. In addition, the deep cryogenic tempering process creates a
denser molecular structure. The result is larger contact surface area that
reduces friction, heat and wear.
The Results:
- Increases abrasive wear resistance.
- Requires only one permanent treatment.
- Change the items entire structure, not just
the surface. Subsequent refinishing operations or re-grinds do no affect
permanent improvements.
- Eliminates thermal shock through a dry,
computer controlled process.
- Increases durability and wear life.
- Decreases residual stresses in tool steels.
- Decreases brittleness.
- Increases tensile strength, toughness, and
stability coupled with the release of internal stresses.
|
