Abstract
Intermetallic compounds have high-specific strength, good creep resistance and excellent oxidation and corrosion resistance at high temperatures. Those good mechanical properties make intermetallic compounds very promising structure materials in industries. Ni 3Al and Fe 3Al are two typical intermetallic compounds. This paper focuses on machinability and tool wear mechanism of PVD TiAlN coated cemented carbide tool in drilling of Ni 3Al and Fe 3Al. The influences of cutting speeds on tool wear and machined surface roughness were investigated. The tool wear mechanism was analyzed using scanning electron microscopy (SEM) and EDX analysis. Chips were analyzed by SEM and the machined surfaces were examined by surface roughness measurement instrument. Tool life when drilling of Ni 3Al is shorter than that of Fe 3Al. The built-up-edge (BUE) could be formed on the cutting edge in drilling of Fe 3Al, and no BUE was observed of Ni 3Al at the cutting speed of 29 m/min.
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