Improvement of super allay material with surface treatment and its characterization

Inconel 718; iron is a nickel-based superalloy group and contains a significant amount of nickel, iron and niobium. Thanks to the high niobium it contains, it has high strength values with precipitation hardening and maintains its strength up to 650 ° C. Thus, Inconel 718; Aircraft engines, nuclear facilities, such as high temperature resistance and resistance to the desired material has become the group of applications. Surface coating processes are carried out in order to make the material more durable both in appearance and physically and chemically by covering the surface of a metal with metal, nonmetallic or organic material. Boron heat treatment is a diffusion controlled surface hardening process, where the boron phases are formed as a result of diffusion of boron atoms to the material surface at high temperatures. The aim of this study is to determine the phases formed by thermochemical boronization of Inconel 718 superalloy and to investigate the effect of boron layer formed by boronizing on the mechanical properties of the material. For this purpose, samples of Inconel 718 superalloy were boronized by box boring using boron and coal dust at 950 °C for 4, 8 and 16 hours. After boronizing the samples; scanning electron microscopy (SEM), cross-sectional investigations, X-ray diffraction (XRD) analysis, optical microscope analysis, micro hardness measurements and wear tests were performed. As a result of the investigations, it was found that the best abrasion resistant specimen was subjected to a boronizing time of 4 hours and the hardest and best penetrating layer to support it belonged to the 4 hour specimen. The phases were determined by XRD analysis. Sections of the layers were examined by SEM and Optical analyzes.