Abstract
A large area coating of NiTi was fabricated on Ti-6Al-4V alloy by overlapping of single line clad tracks obtained by TIG arc scanning on the preplaced NiTi powder layer. The overlapping percentage was varied by shifting the successive clad track to a specific distance, and its effect on the clad morphology and the hardness value measured at different locations, i.e., the center of individual clad track and interface between two consecutive tracks were investigated. The wear characteristic of the NiTi clad layer produced at different overlapping conditions was also analyzed through a sliding wear test executed by a ball-on-disc arrangement. The results indicated that for higher overlapping percentage employed during the TIG cladding process, owing to pre and post-heating of the successive clad track resulted in harder phases of NiXTiY, and improved the hardness value and the sliding wear resistance of the clad layer.
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