In this study, a preliminary evaluation was made of the applicability of the signals of the cutting forces, vibration and acoustic emission in diagnosis of the hardness and microstructure of ausferritic ductile iron and tool edge wear rate during its machining. Tests were performed on pearlitic-ferritic ductile iron and on three types of ausferritic ductile iron obtained by austempering at 400, 370 and 320°C for 180 minutes. Signals of the cutting forces (F), vibration (V) and acoustic emission (AE) were registered while milling each type of the cast iron with a milling cutter at different degrees of wear. Based on individual signals from all the sensors, numerous measures were determined such as e.g. the average or maximum signal value. It was found that different measures from all the sensors tested depended on the microstructure and hardness of the examined material, and on the tool condition. Knowing hardness of the material and the cutting tool edge condition, it is possible to determine the structure of the material .Simultaneous diagnosis of microstructure, hardness, and the tool condition is probably feasible, but it would require the application of a diagnostic strategy based on the integration of numerous measures, e.g. using neural networks.
 Seker, U. & Hasirci, H. (2006). Evaluation of machinability of austempered ductile irons in terms of cutting forces and surface quality. Journal of Materials Processing Technology. 173, 260+268.
 Cemal Cakir, M. & Isik, Y. (2008). Investigating the machinability of austempered ductile irons having different austempering temperatures and times. Materials and Design. 29, 937+942.
 Aslantas, K. & Ucun, I. (2009). The performance of ceramic and cermet cutting tools for the machining of austempered ductile iron. Int J Adv Manuf Technol. 41. 642-650.
 Katuku, K., Koursaris, A. & Sigalas, I. (2009). Wear, cutting forces and chip characteristics when dry turning ASTM Grade 2 austempered ductile iron with PcBN cutting tools under finishing conditions. Journal of Materials Processing Technology. 209, 2412-2420.