Improvement of surface properties of inconel 718 parts with pta method

In this study, it was aimed to improve the surface properties of Inconel 718 alloy by using plasma transfer arc (PTA) welding method. In this context, alloying process was carried out with TiC and WC mixed with 50% by volume of Inconel 718 powder. In addition, one specimen was surface modified by applying only constant heat input for comparison purposes. The microstructure of the untreated and PTA treated samples were characterised by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) analysis. The microhardness values were obtained by measuring from the surface of the alloyed samples towards the base material and microhardness-distance graphs were prepared based on the microhardness data. The wear and friction properties of the surfaces were investigated by wear test in accordance with ASTM-G99 standards. The surfaces of the samples were subjected to SEM and EDS analyses and the wear mechanisms were determined in detail. In this study, it was observed that a good metallurgical bond was formed between the surfaces of the samples whose surface properties were developed by PTA welding method and the base material and the structure was changed when the microstructures of the surfaces were examined. When the microhardness values of the samples were examined, it was determined that the highest microhardness value belonged to Sample 6 coated with TiC powder. The lowest coefficient of friction was observed in Sample 4 coated with WC powder. It was determined that the wear resistance of the sample coated with tungsten carbide powder increased by approximately 2.8 times compared to the substrate material.