Low-temperature nitriding of austenitic stainless steels under glow discharge conditions

摘要

Thermo-chemical treatment of austenitic stainless steels has recently been increasingly developed with the aim to improve the frictional wear resistance of the steels without spoiling their high corrosion resistance. Prospective lines of this development are processes conducted under glow discharge conditions, such as nitriding at temperatures below 500°C, nitriding combined with oxidizing, and producing composite layers of the nitrided layer+Ti(NCO) with the use of a Ti(OC{sub}3H{sub}7){sub}4 vapor- containing atmosphere. The paper presents the results of metallographic examinations and the measurements of the phase composition, corrosion resistance and frictional wear of the surface layers produced using these processes, and also describes the kinetics of the glow discharge assisted nitriding process. The results show an increase of the frictional wear resistance of the steels, whereas their good corrosion resistance is preserved.