Considerate that normal rotary hearth furnace can't control the carbon potential precisely, we designed rotary hearth furnace with controlled atmosphere and then managed to use it in manufacturing.
Using the incremental PID formula in the carbon potential control, the carburizing software can manage the whole carburizing process, and can still give the alarm for safety protection.
When carburized under high carbon potential (1. 1% C), microcracks tend to appear on the martensitic matrix near the outer surface of the layer.
This paper deals with the application of microprocessor for gas carburizing to control carbon potential in order to improve the quality of products. Its principle and method are given.
