Abstract
This paper aims at investigating the machinability of particulate reinforced titanium matrix composites (PTMCs) during high speed grinding (80–140 m/s) using a monolayer brazed cubic boron nitride (CBN) superabrasive wheel. The removal mechanism of the hard-brittle reinforcements of PTMCs is discussed based on finite element simulation. Results obtained show that the grinding forces, temperature, specific energy, and ground surface roughness of PTMCs were usually higher than those of Ti-6Al-4V alloy under the defined experimental conditions. The undeformed chip thickness has a great effect on the removal behavior of the hard-brittle reinforcements of PTMCs, which can result in different defects in the ground surface. Finally, the microstructure alteration and hardening phenomenon in the subsurface layer were characterized quantitatively.
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