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Cutting force and wear in continuous turning were measured for cutting tools made of high speed steel, high speed steel coated with TiN, SKS3 steel, S55C steel and pure titanium that had been subjected to nitrogen ion implantation. Auger electron spectroscopy was used to obtain depth profiles of the implanted nitrogen, and an ultra-micro hardness tester provided depth profiles of hardness. The results were as follows.(1) Under specific conditions all cutting tools except those made of S55C steel showed lower cutting force after implantation than before.(2) When cutting S45C steel, crater wear on the rake face of high speed steel were reduced by implantation.(3) Nitrogen ion implantation to high speed steel showed a Gaussian distribution having peak intensity at 0.11μm depth and disappearing at 0.68μm or more.(4) Ion implantation increased the hardness of SKS3 steel, but decreased that of high speed steel.(5) In all materials tested, the rate of elastic deformation of the surface layer underwent a change with implantation.

Improving the Surface Layer of Cutting Tool Materials by Nitrogen Ion Implantation.