In many applications the high demands regarding service life of transmission components can be reached
only by the application of a customized case hardening. This case hardening process results in a wear
resistant surface-layer in combination with a tough core of the component.
However as a side-effect the components get distorted during heat treatment. This distortion has a significant
cost-impact, because distorted components often need to be hard-machined after heat treatment. Therefore
the proper control of distortion is an important measure to minimize production costs.
By applying the technology of low pressure carburizing (LPC) and high pressure gas quenching (HPGQ) heat
treat distortion can be significantly reduced.
HPGQ provides a very uniform heat transfer coefficient. The predictability of movement during quenching is
more certain and uniform throughout the load. Further improvements can be achieved by“Dynamic
Quenching” processes where the quenching severity is varied during the quench sequence by step control of
the gas velocity. Proper fixturing is another factor for distortion control. Modern CFC-materials (carbon
reinforced carbon) are well suited as fixture-material for gas quenching.

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