بررسي رفتار نيتروژن دهي پلاسماي روي قطعات با هندسه پيچيده

Investigating the Plasma Nitriding Behavior on Component Complex Geometry

This paper investigate the effect of plasma nitriding on samples with different grooves. Steel blocks prepared from DIN/2344 hot working steel were plasma nitrided under the gas mixture %75H2-%25N2 at temperature of 500 c, pressure of 4 torr for 5h at different duty cycles and frequencies. Then the phase Micro structural property of surface of groove with investigated by SEM, Hardnees and Roughness of surface. The results of the experiments showd that with increasing the thickness of the groove, frequency and duty cycle. The roughness of surface rais due to the increase in the prouduction of cauliflower shape nitride particles in CPN method in due to continuose spattering of the surface atoms during the process. Also Micro Hardness rais with increasing the thickness of the groove and duty cycle resulting from the increase in perecent of deposition particle nitride. Hollow catod effect occurred in sample with 2mm groove and 80% duty cycle in CPN. This will result in over heating of the sample which leads to a decrease hardness of the surface and an increasing in the Roughness of the surface. the morphology of the surface was also investaged.