INVESTIGATION OF SURFACE PROPERTIES FOR AISI 4340 ALLOY STEEL BY BURNISHING PROCESS USING DIFFERENT PARAMETERS

Abstract

In this study, we have investigated the effect of burnıshıng process on surface propertıes of alloyed steels ın dıfferent parameters, AISI 4340 alloy steel was used in this study. AISI 4340 steel is one of the alloy steels preferred in many fields in engineering because it gives good results in surface finishing applications and can be used, and parameters were determined for the burnishing application with 3 different pass depths and to be applied while keeping the other parameters constant.

In optical microscope images of the samples polished under P1, P2 and P3 conditions are shown, a change in the grain structure was observed after a plastic deformation effect on the surface area. It was seen in the SEM analysis that the layer thicknesses affected by the deformation increased as the processing intensity increased. As a result of EBSD analysis, the nanostructured and fine-grained region was determined together prominently. According to the tensile test results, it was observed that all polishing processes applied increased the strength and ductility properties together. According to the determined parameters, the processes were successfully applied to the samples. Microstructure analysis, XRD analysis, surface roughness measurement, microhardness and tensile tests were carried out to determine the surface qualities after finishing operations.

The aim of this study is improvements in surface properties of AISI 4340 steel by using burnishing process. Since the process is done cold, it is applied without changing the chemical composition of the part, since only the surface and a certain part of it under the surface are affected, without creating a chemical change in the structure of the part