PROGRESS IN THE PROGRAM OF HEAVY-ION IMPLANTATION FOR MODIFICATION OFCOMMERCIAL STEELS AT CHIANG-MAI UNIVERSITY

An ion beam center has been established at Chiang Mai University in Th ailand with the recently completed construction of a self-developed, 1 50 kV, two-beam-line (non-analyzed and analyzed) ion implantation faci lity and a 30 kV, 3 mA, non-analyzed ion implanter based on a duoplasm atron ion source. Using these facilities, a program of heavy ion impla ntation in metals and alloys is being carried out. The present work is focused on various nitrogen ion implantations of steels for local ind ustry. This paper reports our research results including data on the h ardness and wear resistance of local stainless steels, carbon steels a nd mild steels as a function of ion doses, and data on the oxidation b ehavior and tribological properties of ion implanted steels. Also disc ussed are high current, high dose and low energy ion implantation, and implantation in practical objects. Experimental data on implantations beneficial to the mechanical and chemical properties of the steels ar e presented and provide baselines for industrial applications.