DEVELOPMENT OF HIGH PERFORMANCE MACHINING TECHNIQUES THROUGH DATA MINING AND INTERPRETATION: MODELLING FOR TEMPERATURE DISTRIBUTION OF NIMONIC 90

Contact Number: 8010080095 Abstract- Nickel based super alloys are fast gaining relevance and importance in the aerospace and steam power industries, as they have high strength to weight ratio, and exhibit superior mechanical properties. In addition, they possess high resistance at high temperatures; maintaining their resistance to corrosion, thermal shock, creep and erosion at elevated temperatures. Nickel based alloys contain a high percentage of Nickel and Chromium elements, and a continuous face centered cubic austenitic phase with poor thermal diffusivity, which is formed after various surface treatments. The austenitic phase contributes to the high yield strength and results in poor machinability of Nickel based alloys. The basic problem in machining of Nickel based alloys is their high chemical activity at high cutting forces and temperatures. Most of the tool coatings (TiN, TiC, TiSn, etc.) have higher chemical affinity with Nickel based alloys. So, chemical diffusion between the tool and the machined work-piece takes place, thus affecting the tool life and machined surface quality. To be able to accurately predict the temperature distribution across the Nickel based work piece, we developed a 3D simulation for temperature modelling of Nimonic 90 during turning and then contrasted the values predicted by the model with the actual experimental values. Tweaking the various variables, we can find out the optimum parameters to be used while machining so as to have the desired temperature distribution across the work piece