Abstract
An examination was carried out on AISI304 Stainless steel with tungsten by surface modification using Gas Tungsten Arc as a heat source at a constant flow of nitrogen gas added to Argon shielding atmosphere. The microstructure of the W - modified area were observed using a metallurgical microscope. The composition of the surface modified layers were analyzed using EDS. The result of the EDS analysis confirmed the presence of W and N2 content in the modified layers. Further, the presence of intermetallic phases were found during the XRD analysis. Hardness measurements were carried out along the depth direction. The hardness increased by 2010HV on the W- modified layer under N2 atmosphere compared to the 277HV of the substrate. It is noticed that the wear resistance in the surface modified area improved to 0.8 × 10−4 mm3 / N-m from 10.94 × 10−4 mm3 / N-m of the substrate. The reduction in grain size, formation of intermetallic phases, and dispersion of W – particle in the modified layers has improved the hardness and the wear resistance.
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