Experimental Investigation of Various Surface Integrity Aspects in Hard Turning of AISI 4340 Alloy Steel With Coated and Uncoated Cermets

Abstract

The recent developments in science and technology are exerting tremendous burden on manufacturing industries. These manufacturing industries are busy finding solutions to reduce the cutting costs, increase the quality of the machined parts and testing different materials which can be made versatile for cutting materials which are difficult for machining. High-speed machining has been the main objective of the Mechanical Engineering through ages. In this study, the variation of surface integrity parameters of hardened AISI 4340 alloy steel is analysed. The surface integrity parameters like surface roughness, microhardness, residual stresses, microstructure and white layer of hardened AISI 4340 alloy steel is to be found using Cermet cutting insert under dry condition. Furthermore, the flank wear of the cermet tool and segmentation of the chips are also compared for coated and uncoated cermets. Firstly, the heattreated workpiece is machined on lathe machine and then cut by wire EDM process, followed by polishing of workpiece by different grades of papers. Lastly the workpiece is polished by diamond and lately, the microstructures are studied by SEM. Furthermore, the analysis is done and the results are compared to different working conditions, different grades of polishing papers, etc.