فهرست نشریات علمی دسترسی آزاد ایران

The aim of this study is to investigate the effect of plasma nitriding time on mechanical and tribological behavior of nitriding coatings produced by plasma-assisted chemical vapor deposition (PACVD). The heat treatment of quench and temper was carried out on hot work AISI H12 (DIN 1.2606) steel samples. A group of samples was plasma nitrided at 470 °C for 2 h in an atmosphere containing 25 vol. % nitrogen and 75 vol. % hydrogen and another group of samples was nitrided on for 4 h, 8 kHz frequency, and 33% duty cycle. The microstructural, mechanical, and tribological properties of the coatings were investigated using optical microscopy, microhardness tester, and pin-on-disc wear test. The load of wear test was 10 N and the samples were worn against different pins, ball-bearing steel (DIN1.3505). The results indicate that the difference of hardness between the samples with different time was 450 HV and the former samples showed a significant amount of wear resistance in comparison to the latter ones.