Tungsten Carbide Cutting Tools Diffusion Wear

After decades of development, the hardness of tungsten carbide cutting tools has reached 89 ~ 93HRA, at a high temperature of 1000 ℃ still has good red hardness, durability is several times its high speed steel cutting tools. tungsten carbide cutting tools material is WC, TiC, TaC, NbC, VC and other refractory metal tungsten carbides and prepared by powder metallurgy from iron group metals as a binder. Compared with the high-speed steel, it has high hardness, wear resistance and red hardness; compared with super hard material, it has a higher toughness. Because of tungsten carbide cutting tools has a good overall performance, so in the tools industry has been widely used.

However, under certain circumstances, tungsten carbide cutting tools diffusion wear occurs. Diffusion wear occurs at high temperature effects. tungsten carbide at the time of cutting temperature 800 ~ 900 ℃, W and C atoms will diffuse to chip in, chip in Ti and Al atoms will diffuse into the tool, after mutual displacement between atoms, it will reduce the tools interatomic bonding strength and wear resistance and the formation of diffusion wear. When cutting titanium, due to the high temperature of the cutting area, and the surface is always in contact with each other just cutting out a fresh surface, chip, before the workpiece and tools flank greater chemical activity, so the tools material and titanium tungsten carbide element alloy contact surfaces will spread to the other side to each other, and cause diffusion wear, changing the chemical composition of both the direct impact on its performance.




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