Behaviour at Nitriding in Fluidized Layer of Austenitic Stainless Steels at the Temperature of 1050 °C

Résumé

Nitriding at low temperatures, 450-500 ^oC of austenic stainless steels lead to the obtaining of the tough layers over 1000 HV₀₀₅ but having thicknesses of tenths of microns. Moreover, nitriding at 500 ºC has determined the obtaining of layers of combinations with carbonitrades that caused a severe decrease of corrosion resistance. Nitriding at 1050 ºC with an enriched nitrogen austenitic diffusion structure. The nitrogen concentration ensures, by the increase of the diffusion speed, a high layer depth of millimeter tenths,under the saturation limit lead to a reduced strength down to 500 HV₀₀₅. The nitrated layer has displayed good properties of corrosion resistance and a twofold increase of the abrasive wear strength, which recommend the treatment for numerous practical applications.