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5145 |
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Tuesday, March 21, 2017, Hall Ford 11:45 AM Surface Treatment / Materials |
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Electron beam profiling and electron beam remelt-bonding for improving the load-bearing capacity of thermal spray coatings |
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Philipp Hengst* / TU Bergakademie Freiberg/ Institute of Materials Engineering, Germany Rolf Zenker / TU Bergakademie Freiberg; Zenker Consult, Germany Tilo Süß/ IWB Werkstofftechnologie GmbH, Germany Klaus Hoffmann/ IWB Werkstofftechnologie GmbH, Germany |
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The industrial application of thermal spray coatings is enabled by a wide range of coating materials and thermal spraying processes. Ever-more demanding loading conditions (in terms of pressure and tensile, shear or torsion forces) lead to higher requirements for both components and coatings. This research project examines the possibility of using electron beam profiling as a pre-treatment and electron beam remelt-bonding as a post-treatment to increase the load-bearing capacity of thermal spray coatings. In this work, electron beam profiling was used to generate lateral pattern indentions in steel and aluminum substrates. The influence of the electron beam parameters on profile geometry was examined. Additional investigations with variable beam incidence angles and optimized beam parameters produced open profiles with several profile depths and widths. With electron beam profiling, improvements in shear strength could be achieved. After the deposition of the coating, electron beam remelt-bonding created a local metallurgical bond between the substrate and the spray coating. Remelting of the Co-based coatings deposited on the steel substrate (X2CrNiMo22-5-3) resulted in various remelt geometries depending on the electron beam parameters. The remelt-bonds were characterized by light optical microscopy and hardness measurements. |