Kendiliğinden ilerleyen yüksek sıcaklık sentezi ile süperalaşımların üretilmesi ve çelik altlıklar üzerine kaplama uygulamaları

This study aims to produce a coating layer of Inconel 718 superalloys on a steel substrate using the self-propagating high-temperature synthesis (SHS) method. This method is known for being a fast and low-energy process. In order to obtain the desired alloy composition, a mixture of metal oxide powders, including NiO, Cr2O3, Nb2O5, MoO3, TiO2, Co3O4, and Fe2O3, as well as reducing Al metal powder, were utilized as raw materials. The exothermic reactions were realized by initiation, and the obtained molten alloys were simultaneously poured on the substrates to form the coating layers. The substrates were made of AISI 1050 alloys having 20 and 40-mm diameters. Furthermore, this study utilized three distinct experimental setups for SHS reactions. Two assemblies were constructed to remain stationary, while the third was rotated at various speeds of 200, 350, and 500 rpm. The microstructure and mechanical properties of the products were investigated through extensive characterization studies using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF), and micro-hardness (micro-Vickers) testing. As a result of the experimental studies, the SHS method is an effective process for coating with solid bonding properties at the interface. It has been observed that the hardness value, which measures the resistance of a material to deformation, increases from the steel substrate to the superalloy coating. Upon closer examination of the interface between the two materials, it is evident that the surface properties of the low alloy steel material have been improved.