The nitration process is performed at a low temperature compared to other surface thermochemical processes. Thus, nitrogen is diffused into the material by diffusion without reaching the austenite phase. Since the temperature is low, phase transformation does not occur in the material. That is, nitrogen diffuses into the ferrite phase. But a quenched and tempered material (at least on its surface) does not have a ferrite phase. Or in a fully pearlitic cast iron, there is no ferrite phase. In either case, how will nitrogen diffuse without the ferrite phase? I know it's done; But I wonder how the mechanism is. I couldn't understand this part. Do you have an article or idea that might help?
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