Abstract
ABSTRACTIn order to study the effect of cutting speed, feed and tool wear of superalloy Inconel625 on machined surface quality, coated carbide tools CNMG120408 were selected to carry out turning test under different cutting conditions. The change laws of roughness of machined surface, surface work hardening and white layer were analyzed under the condition of different cutting speed, feed and tool wear. The results showed that the machined surface roughness has been reduced from 1.140 μm to 0.640 μm with the increase of cutting speed, the surface roughness value increased with the increase of feed and flank wear and the depth of work hardening layer decreased with the increase of cutting speed, while work hardening rate was improved. The depth of work hardening layer was increased with the improvement of feed and flank wear. Tool wear, cutting temperature and the thickness of white layer gradually was increased with the increase of cutting speed. Meanwhile, the critical temperature of the material phase transition has been reduced because of the severe plastic deformation in the cutting process, which leads to the formation of white layer at low cutting temperature.
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