Numerial Simulation Of Diffusion Failure Of Cemented Carbide And Optimized Design Of Cutting Tools' Composition

The cemented carbide has advantages of high hardness, resistant to elevated temperature, corrosion resistant and good wear-resistance which is a cutting tool widely used. Now hard alloy cutting tools involved all kinds of cutting tools and take the place of high-speed steels. With the development of material science and producing technology, especially the development of coating technology, the performance of cutting tools has being improved.When cemented carbide cutting high temperature steels or stainless steels, cutting force is high and the workpiece has high plastic deformation. There are high friction and cutting heat between tools and workpieces. Since the thermal conduction modulus is low and the cutting heat concentrate in cutting area, the cutting temperature raise rapidly. So the high cutting force and cutting temperature provide condition of diffusion failure.According that the fact that sticking of cutting tools is serious when using the hard alloy cutting tools to cut austenite non-corrosive steels, this article use the DICTRA module in thermodynamic software Thermo-Calc to simulate the atom diffusion between the hard alloy cutting tools and cut work-piece. Atom inter-diffusions are simulated between Fe-Co,Cr-Co,Mn-Co,Ni-Co and the beneficiation of C on the surface of the cutting tools, the conclusion that atom inter-diffusion between the cutting tools and work-piece is the prime reason of sticking of cutting tools is explained.According to the performances of hard alloy cutting tools declining by the grain of WC growing rapidly, adding grain inhibitors can restrain the growing of the grain. Restraining effects of NbC,TaC,VC,Cr3C2,TiC are found out and the influences...