Abstract:
In this study, Glow Discharge Plasma Nitriding
(GD_PN) of C-300 maraging steel is conducted at 425 C
to 500 C for 4 h using H2 and N2 in a ratio of 4:1. The
GD_PN treated surface is characterized by XRD and SEM
and assessed for micro-hardness, tensile strength, corrosion
as well as wear resistance. The micro-hardness measurements show an improvement in the hardness of the samples’ surface by an approximate factor of 3.2. In the context
of the case depth, it varies from 11.53 lm for 425 C to
92.58 lm for 500 C. The wear test results show
improvement in wear resistance by a factor of 23.46 for
treatment at 490 C compared to the untreated sample. The
tensile tests indicate that the ultimate tensile strength
increases by a factor of 2.23 for treatment at 490 C in
comparison with the untreated sample. The XRD results
depict that the plasma nitrided layer is incorporated with
c
0
Fe4N as well as e Fe23N phase. Finally, best corrosion resistance is observed for maraging steel sample
treated at 490 C.
