چکیده (انگلیسی):

Plasma immersion ion implantation (PIII) of nitrogen has been performed on three austenitic stainless steels namely, Type 304L SS, MnSS-1 (16%Cr-6%Mn-4Ni) and MnSS-2 (16%Cr-9%Mn) with at three different temperatures namely, 250, 380 and 500°C for 3 h. The GXRD studies shows that mixed iron nitride phases were formed along with expanded austenitic, when sample implanted at 250°C and 380°C. These nitrides are with different stoichiometry along the thickness and their formation is less favorable in nickel free Mn alloy at lower implantation temperature and timing (250°C for 3 h). On higher implantation condition (500°C, 6 h), Ni promotes the ′ formation and Mn suppress the ′ formation. Microhardness measurements revealed a significant increase in hardness after PIII treatment for all the alloys under investigation, but it is more effective in Ni free Mn containing SS.