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- W2899683586 abstract "Polycrystalline diamond (PCD) is one of the most important wear-resistant materials. Electrical discharge machining (EDM) is often used to remove pieces with different sizes, shapes, and surface qualities from polycrystalline diamond compacts (PDC) in order to satisfy the demands of PCD tools. However, as the special properties of the PCD, the structure transformation and removal process of the PCD materials are different to that of the cemented carbide substrate. This paper proposes a removal mechanism for PCD considering the morphology of discharge craters and the micro-structural evolution of diamonds. It was observed that the tensile residual stress was contributed to a large diameter value and irregular shapes of discharge craters in cobalt-rich areas. The graphene was obtained through the peeling process of graphite under the action of tensile residual stress when the thickness of metamorphic layer was in a small level. The degree of graphitization and number of crystal defects increased with increasing the thickness value of metamorphic layer according to the Raman shifted analysis. A metamorphic layer containing graphite, cobalt, and cobalt carbide was observed by the XRD analysis, which increased in thickness with increasing discharge energy. The hardness of PCD layer was reduced due to the action of the metamorphic layer, which damaged the performance of PCD tools. The electrical conductivity of the PCD layer was increased with increasing the thickness value of metamorphic layer, which contributed to the high machining efficiency with enlarging the discharge areas. Meanwhile, the diamonds were removed in the graphite form due to the graphitization of diamonds were the mainly removal mechanism in electrical discharge machining." @default.
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- W2899683586 date "2019-01-01" @default.
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- W2899683586 title "A study on structural evolution of metamorphic layer on the surface of PCD in electrical discharge machining" @default.
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- W2899683586 doi "https://doi.org/10.1016/j.diamond.2018.11.006" @default.
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