LAUSR

Abstract High-pressure jet assisted machining has been proposed in order to solve the problems of high cutting heat and difficult heat dissipation. This research investigated the multiple surface integrity indicators during high-pressure jet assisted machining Ti-6Al-4 V considering cooling pressures and injection positions, involving surface topographies (surface defect and 3D roughness parameters), microstructural behaviors (plastic layers and phase compositions), mechanical performances (microhardness and residual stresses). Compared with dry cutting conditions, surface roughness Sa and Sdr decreased under high-pressure jet assisted machining. The plastic layer depth correspondingly decreased with the cooling pressures increasing. The phase transformation occurred under different cooling pressures and injection positions, which part of α-phase transformed to β-phase. With the cooling pressures increasing, the peak intensity of β-phase of Ti-6Al-4 V was gradually enhanced, the work hardening degrees were reduced, and the residual compressive stresses of machined surfaces increased.