|
5438 |
|
Thursday, June 08, 2017, Hall 27 2:00 PM Pre- & Post-Treatment |
|
Ultrasonic shot peening of high-velocity wire arc sprayed coatings |
|
Christian Rupprecht* / Technische Universität Berlin, Germany Gerd Paczkowski/ Institut für Werkstoffwissenschaft und Werkstofftechnik, TU Chemnitz, Germany Michael Schneeweiß/ Institut für Produktionstechnik, Westsächsische Hochschule Zwickau, Germany Jan Glühmann/ Institut für Produktionstechnik, Westsächsische Hochschule Zwickau, Germany Frank Lichtenthäler/ SMS group GmbH, Germany Michael Stark/ SMS group GmbH, Germany |
|
In order to improve the properties of arc sprayed coatings, which conventionally show a relatively high pore content, undesired tensile residual stress and a rough surface morphology, two optimization strategies are presented. First a self-developed technique of high-velocity wire arc spraying has been used in order to achieve good interface adhesion. In a second step, the coatings have been treated by means of ultrasonic shoot peening. This technology is characterized by a relatively low mechanical load in comparison to conventional shot peening methods such as steel ball blasting or rolling treatment. Aluminum, copper und iron-based coatings treated by ultrasonic shot peening stand out due to a complete densification in surface-near areas, a transformation of tensile residual stress into compressive stress and a significant increase of the dislocation density. In the case of manganese hardening steel, ultrasonic shot peening causes a lattice transformation during cold work. In this way, the wear resistance as well as the corrosion resistance of the coatings could be increased. |