Abstract
This research deals with the effectiveness of TiAlSiN coated WC-Co metal cutting inserts when turning Inconel 718, a highly challenging heat-resistant superalloy (HRSA) to machine. The main objective is to extend the durability and enhance the wear resistance of cutting inserts by utilizing an advanced TiAlSiN coating, applying High-Power Impulse Magnetron Sputtering (HiPIMS) technologies to address the challenges of limited tool life when machining Inconel 718 with standard WC-Co inserts. The existence of hard phases such as Ti,Al,Si and N were confirmed by XRD and EDS mapping analysis. The enhancements in hardness, thermal stability, and oxidation resistance were evaluated and substantiated. The experimental results revealed that the life of TiAlSiN coated inserts was much higher than normal WC-Co inserts. Improvement in tool life of 375.4% is noticed under best condition. The optical study of wear patterns provided additional evidence for the effectiveness of the coating, as well as the controlled flank wear and nose radius wear. The findings suggest that HiPIMS-deposited TiAlSiN coatings are an encouraging solution for enhancing WC-Co turning inserts performance.
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