The addition of carbon to the atmosphere reduces the overall time of the nitriding process to generate a specific case depth. The process of nitriding takes place in the plasma (electrically, conductive gas) in a vacuum stove at 350 to 600° C. The nitrogen from the nitriding material diffuses into the surface and causes a change of the chemical composition and the structure in the surface layer (see figure 70 [24] ). A normal nitriding depth goes from 0,01 mm up to 0,7mm for which the nitriding time can be up to 100 hours, and can rise the hardness of the steel up to 1200 HV . Gas nitriding is a case-hardening process whereby nitrogen is introduced into the surface of a solid ferrous alloy by holding the metal at a suitable temperature in contact with a nitrogenous gas, usually ammonia. The process Nitriding is a diffusion process and not a deposition process. The nitriding temperature for all steels is between 495 and 565°C (925 and 1050°F). Since nitriding changes the chemical composition of the surface of the substrate and the process is carried out at medium temperature, it is classified as a thermo chemical process. The process is based on the ionization of a single molecular gas, which is nitrogen, and the liberation of nitrogen ions. It is a diffusion procedure that is reliant on a nitrogen source, and a low thermal process temperature (which, by looking at the Iron Carbon Equilibrium diagram is in the ferrite/cementite region of that diagram) just as the process of carburizing and carbo-nitriding processes are. To realize short cycle times the highest treatment temperature is … Report’1201’ Page’2’! In nitriding, this can be accomplished by increasing the processing tempera-ture and ammonia flowrate. 08 Gas nitriding and nitrocarburising 2.1. The process offers a shorter cycle time due to the steel surface preparation and the gas ionization. Develop a model-based optimization process to determine the optimum process parameters for several process goals: minimum cycle time, minimum cost, maximum productivity, minimum gas consumption. The process time is diffusion controlled. The amount of growth is usually constant for identical parts nitrided in different batches by a fixed processing cycle. The process steps in nitriding and nitrocarburising A nitriding/nitrocarburising cycle has three major steps: 1) heating to temperature, 2) holding at temperature for a sufficient time to reach the required nitriding depth and 3) … The plasma nitrocarburising process is usually carried out at temperatures between 570 and 580 °C in a gas mixture that provides both nitrogen and carbon to the surface of the material. Nitriding is a thermo-chemical heat treatment process of introducing nitrogen into the outermost surface of parts and components. Due to this reason a compromise of nitriding temperature has to be found. Fully Automated Nitriding Furnaces As is the case with all processing, it is desirable to minimize the cycle time. However, in nitriding, higher processing temper-atures and higher ammonia flowrates lead to an increase in the growth rate Commonly, the definition of term ‘nitriding’ is synonym to gas-nitriding of nitriding (alloy) steels (also called nitralloys), i.e., it is understood as the enrichment of solid steel surface with nitrogen by heating it in an atmosphere of NH 3 gas at a temperature normally in the range of 500-575°C for a prolonged period of 48 to 96 hours, depending upon the case-depth desired. Dimensional change in nitrided parts are governed largely by composition, tempering temperatures, time/temperature of nitriding, relative thickness of case/core, shape of the part and areas marked off to prevent nitriding. The specifications of the gas nitriding process will determine the quality of the nitriding layer. 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