K. M. Winter, PROCESS-ELECTRONIC GmbH, Heiningen, Germany
Expert systems for gaseous nitriding, be it simulators or controllers, are largely based on the Lehrer Diagram, which shows the correlation between nitrogen-iron phases, temperature, and the partial pressure ratio of ammonia and hydrogen. While this theory is widely held, in real-world applications, nitriding cycles do not always work in this way, and thus materials, parts, and results do not match Lehrer Diagram’s calculations. In this presentation we will identify the additional parameters needed to complement the Lehrer Diagram by using a variety of processes and samples.
Summary: Expert systems for gaseous nitriding, be it simulators or controllers, are largely based on the Lehrer Diagram, which shows the correlation between nitrogen-iron phases, temperature, and the partial pressure ratio of ammonia and hydrogen. While this theory is widely held, in real-world applications, nitriding cycles do not always work in this way, and thus materials, parts, and results do not match Lehrer Diagram’s calculations.
In this presentation we will identify the additional parameters needed to complement the Lehrer Diagram by using a variety of processes and samples.
