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| Abstract No.: |
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Scheduled at:
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Friday, May 06, 2022, Hall G2 11:20 AM
Characterization & Testing Methods I
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| Title: |
Dynamic impact wear analyses of selected cobalt based HVOF sprayed coatings
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| Authors: |
Sarka Houdkova* / VZU Plzen s.r.o., Czech Republic
Josef Daniel / Institute of Scientific Instruments, Czech Academy of Science, Czech Republic
Josef Duliskovic/ Research and Testing Instituite Plzen, Czech Republic
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| Abstract: |
Impact testing appears as a most promising tool for gaining information on coating behavior in load-bearing applications. During dynamic impact test an indenter impacts successively the surface of the coating with constant force and frequency. The deformation of the coated specimen during impact testing is affected by the mechanical properties of both the substrate and the coating. Similar loading mechanism can be identified at various coated components in many branches of thermal spraying applications, such as solid particle or water droplet erosion, cavitation, etc. Varying the impact load and number of impacts, the evolution of coating surface deformation and contact fatigue failures can be observed. In the paper, the influence of dynamic impact load and number of impacts on the resulting impact crater volume and morphology is analyzed, and the results interpretation in form of Wohler-like dependance is suggested and demonstrated on two types of HVOF sprayed coatings CrC-based hardmetals and Co-based alloys. The low-number impact craters evolution and subsurface cracks propagation of HVOF sprayed Co-based alloy coatings is analyzed in more detail, by means of 3D optical microscopy and SEM.
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