The impact of cutting speed and depth of cut on cutting force during turning of austempered ductile iron

Abstract

Abstract Machining has been a foremost part of manufacturing till date. Austempered Ductile Iron (ADI) is a comparatively new material to the industries and it is often conveyed that ADIs are a difficult material for machining. This article concentrates primarily on machinability studies on turning of austempered ductile iron. Ductile Iron (DI) has been austempered for various durations at 250\u202f°C and the austempering process window was established by examining the microstructure. The material has been characterized with microstructural characteristics through optical microscopy, SEM and XRD. In order to explore the impact of cutting parameters, namely the depth of cutting and cutting speed, the samples were turned within the process window with the help of a TiAlN-coated tungsten carbide insert. The objective of present investigation on ADI machining is to study the impact of these cutting parameters on required cutting forces throughout the turning. The observed behavior of the machinability was investigated with the microstructural analysis and a structural-property co-relation was established. The magnitude of radial force was disclosed to be greater at all cutting speeds during turning operation for different austempering times. Based on the findings, it is concluded that the magnitude of cutting forces for ADI processing is considerably reduced by choosing a greater cutting speed and a larger cutting depth. The best machining response in terms of cutting forces was achieved towards the start of the process window for all cutting speed and depth of the cut.