Abstract
Active screen plasma nitriding (ASPN) is a novel thermochemical surface treatment which has many specialities compared to the conventional direct current plasma nitriding (DCPN). The edge effect is eliminated, the hardness and layer thickness on the surface are homogeneously distributed. In this study, 42CrMo4 alloyed steel was treated with different screen sizes (screen diameter, hole size) active screen plasma nitriding. The parameters of treatment are similar in all cases (4 hours at 490°C and 2,2 torr). The nitrided samples were characterized by atomic force microscope (AFM) to analyse the roughness of the surface. The cross-section hardness of the samples and the thickness of the nitrided layers were also measured.
Highlights
The nitriding process is widely used for improving the hardness and the wear resistance of steels
Active screen plasma nitriding (ASPN) is a novel thermochemical surface treatment which has many specialities compared to the conventional direct current plasma nitriding (DCPN)
42CrMo4 alloyed steel was treated with different screen sizes active screen plasma nitriding
Summary
The nitriding process is widely used for improving the hardness and the wear resistance of steels. The main advantages are based on the replacement of the glow discharge region This means, that the plasma forms on the screen, instead of the workpiece, which causes homogeneous hardness and layer thickness on the surface of the specimen, the issues of the DCPN are eliminated. Several researchers have reported the effects of the nitriding parameters, such as the distance between the screen and the sample [6,7,8], the effect of different screen sizes [9,10,11] on the surface roughness [12,13,14,15,16] and wear and corrosion resistance improvement [17,18,19,20]
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