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Contact damage and residual strength in polycrystalline diamond (PCD).pdf

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Contact damage and residual strength in polycrystalline diamond (PCD).pdf

Diamond Related Materials 65 (2016) 131–136 Contents lists available at ScienceDirect Diamond Related Materials journal homepage: /locate/diamond Contact damage and residual strength in polycrystalline diamond (PCD) F. García-Marro a,b, A. Mestra a,b, V. Kanyanta c, K. Maweja c, S. Ozbayraktar c, L. Llanes a,b,? a CIEFMA - Dept. of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya, Barcelona, Spain b CRnE - Center for Research on Nanoengineering, Universitat Politècnica de Catalunya, Barcelona, Spain c Element Six UK Ltd., Global Innovation Center, Harwell, Oxford, United Kingdom article info Article history: Received 30 November 2015 Received in revised form 26 February 2016 Accepted 5 March 2016 Available online 7 March 2016 Keywords: Diamond-PCD Contact damage Residual strength Spherical indentation abstract The tolerance to contact damage of polycrystalline diamond (PCD) composites is investigated. Three different PCD grades are considered. Contact damage is extrinsically introduced by spherical indentation techniques, an approach well-established to evaluate damage tolerance issues in other hard materials. Such damage is induced on the surface of polished specimens, under both monotonic and cyclic loading conditions, and is characterized by optical and scanning electron microscopy. Residual strength is used as discriminative parameter for evaluation of damage tolerance. Hence, non-indented (reference) and indented specimens are fractured by means of biaxial ball-on-three-ball ?exure testing. Results show that tolerance to contact damage is dependent on the microstructural characteristics of each PCD grade. Hence, although ?ne PCD grade exhibits the highest reference strength, corresponding indented specimens show pronounced fracture resistance decay for relatively high applied loads or number of cycles. On the other hand, the bimodal and coarse PCD variants are found to be more tolerant to contact damage, i.e. fracture stre