Evolution of surface and subsurface properties of coated tools in high speed cutting of GH2132
During high-speed cutting,the changes in surface properties and subsurface stresses of coated cutting tools directly affect their cutting performance.High speed turning experiments were conducted on GH2132 high-temperature alloy using PVD-TiAlN hard alloy coated tools to study the changes in tool surface properties during the cutting process.Raman spectroscopy was used to measure the residual stress distribution on the sub surface of coated tools at different wear stages.The results show that during the complete service life of the cutting tool,the residual compressive stress and surface microhardness both show a trend of first increasing and then decreasing.The residual stress in the coating is mainly residual compressive stress,which gradually increases along the depth direction.However,when the wear reaches the later stage of stable wear,the residual compressive stress of the coating decreases near the substrate.During high-speed dry cutting,the tool has the best surface performance and the maximum residual compressive stress on the subsurface during the early stage of stable wear.At this time,the tool has the best cutting performance and slow tool wear.
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