Carbonitriding studies with a high amount of nitrogen are characterized by adding ammonia to the process gas at a higher rate than the usual 3-5%. This work focuses on the impact of nitrogen on the lifetime of carburized parts (e.g. gears, sprockets, bearings, crankshafts) exposed to Hertzian pressure or fatigue.
We have a pretty good idea of what will happen to steel
parts if exposed to a defined atmosphere at a given temperature. In order to
determine the process parameters, we can use the well-known Lehrer Diagram for
a nitriding process, or we might use one of the various Fe-N-C phase diagrams
for a nitrocarburizing process.
Measurement of the various potentials in nitriding or nitrocarburizing atmospheres and the principles used by these systems have been well known for years. However, there are obviously some big differences in the way such instrumentation is designed and how they behave in regular industrial furnaces compared to laboratory environment.