Coated Tungsten Carbide Cutting Tools Mechanical Stress And Impact Damage

When cutting, the role of mechanical stress in the coating surface coated tungsten carbide cutting tools, coating and the substrate is first formed joints easily crack two sources to rapidly penetrate the surface coating matrix expansion, along with cutting progresses, shallow flaking will occur, this time the blade did not fail, as the cutting continues, the base material of the crack gradually extended in parallel in a network of cracks, peeling may occur deep, this time will result in a hard coating alloy tool failure. Residual stress state coated tungsten carbide cutting tools in initiation and propagation of cracks in the surface of the blade about the residual compressive stress can prevent crack propagation, which is resistant PVD coated tungsten carbide cutting tools coating flaking better performance reasons.

Impact damage is the main reason for the occurrence of coated tungsten carbide cutting tools when turning, when the impact load exceeds the allowable strength edge chipping occurs. Although low-temperature hardness of austenitic stainless steel, but it has serious work hardening, so the impact of a significant chipping occurs under load. Cutting edge radius smaller PVD coated tungsten carbide cutting tools, resulting in low impact resistance of the tool, could easily lead to impact damage PVD coated tungsten carbide cutting tools.

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