Influence of Austenite Stability on the Machinability of Different Grades of Austempered Ductile Iron (ADI) During Dry Turning Machining

Abstract This work evaluated the machinability characteristics of three different austempered ductile irons using indicators: cutting force, tool wear, and surface roughness. Additionally, this paper addresses interplay among production conditions ADIs, microstructural development, TRIP effect arising from transformations retained austenite into martensite, behavior ADIs. Various characterization studies including hardness measurement, X-ray diffraction analysis, light electron microscope were used. Machinability results indicated that increase in force is always associated with a corresponding martensite content when depth was increased 0.5 to 2.0 mm. Such correlation more evident ADI grade at high austempering temperature, 375 °C (ADI-375). It noticed although ADI-375 has only 0.46% structure before machining, ratio increases highest cut mm reach about ~ 23% force. Ferrite morphology have great impact on overall finish each as it leads deteriorating investigated alloys. could explain roughness values across all processing experiments obtained austenitized intercritical region (IADI), which mainly contains ferrite content. Tool wear chip also studied work.