Hoch verschleißbeständige karbidhaltige Beschichtungen lassen sich durch Auftragschweißen mittels Plasma-Pulver-Auftragschweiß-Verfahren herstellen. Die Verwendung von Vanadiumkarbid vermeidet unerwünschte Reaktionen mit dem Matrixwerkstoff, so dass hochkorrosionsbeständige Schichten auf Fe-Basis für den Einsatz im Lebensmittel-und Meerwasserbereich und auf Ni-Basis für den Bereich anorganischer Säurebelastung erzeugt werden kön-nen.Ein kombinierter Test relativiert den Korrosionseinfluss bei kombinierter Beanspruchung durch Abrasivverschleiß-und Korrosion und zeigt das Primat des Verschleißabtrages auf das Einsatzverhalten.Schlüsselworte: Auftragschweißen, Plasma-Pulver-Auftragschweiß-Verfahren, Beschichtungswerkstoffe, Verschleißbestän-digkeit, Korrosionsbeständigkeit Highly wear-resistant claddings which contain carbides can be applied by weld surfacing with the PTA process. The use of vanadium carbide prevents undesirable reactions with the matrix material. Thus, highly corrosion-resistant Fe-based claddings can be produced for applications in the food and marine industries, and Ni-based claddings can be applied to components exposed to inorganic acid attack.A combined test is applied for determining the relative effect of corrosion under combined exposure to abrasive wear and corrosion and indicates the primacy of abrasive wear for behaviour in operation.
This study examines simulative experimental investigations on the additive manufacturing of complex component geometries using 3D plasma metal deposition (3DPMD). Here, complex contour surfaces for a cross-rolling tool were produced from weld metals in multilayer technology through 3DPMD. As a consequence of the special features of 3DPMD with large-weld metal volumes, greatly differing properties between base material/deposited material and asymmetrical heat input, the resulting shrinkage, deformation and residual stresses are particularly critical. These lead to dimensional and form deviations as well as the formation of cracks, which has a negative influence on the quality of the plasma deposition-welded component structures. By means of the thermo-elastic-plastic simulation model, the temperature field distribution, deformation, and residual stresses occurring during additive 3DPMD of tool contours were predicted and analyzed. The temperature field distribution and its gradients were determined using the ellipsoid heat-source model for the 3DPMD process. On this basis, a coupled thermo-elastic-plastic structural–mechanical analysis was performed. Accordingly, the results achieved were used for the production of almost-net-shaped tool contour surfaces with predefined layer properties. The acquired simulation results of the temperature fields, deformation, and residual stress condition show good alignment with the experimental results.
Zur Verbesserung der mechanisch-technologischen Eigenschaften der Umformwerkzeuge (insbesondere mittelgroßer Bauteilgeometrien) hat sich das formgebende Plasma-Pulver-Auftragschweißen als Fertigungsmethode etabliert. Es konnte nachgewiesen werden, dass durch den Einsatz von Kobalt-und Nickelbasislegierungen die thermomechanischen Eigenschaften dieser Werkzeuge verbessert werden. Mit der Einlagerung von Karbiden in den Kobaltbasis-Matrixwerkstoff wurden die stark gefährdeten Flächenberei-che der Werkzeugstrukturen besser geschützt und damit die Standzeiten gegenüber den bisher hergestellten Bauteilen aus konventionellen Werkstoffen deutlich erhöht. Mit hergestellten und erprobten Segmenten eines Querwalzwerkzeuges konnten die gewonnenen Kenntnisse überprüft werden, inwieweit sie in die Praxis umsetzbar sind.Schlüsselworte: Schmelzschweißen, Werkstoff, großvolumiges Auftragschweißen, Umformwerkzeuge, Querwalzen, Plasma-Pulver-Auftragschweißen (PPA), Formgebendes Schweißen For the improvement of the mechanical-technological properties of the forming tools (in particular medium sized component-geometries) the build-up plasma deposition-welding was established as a manufacturing process. It could be proven that the thermo-mechanical characteristics of these tools are improved by using of cobalt and nickel basis alloys. With the embedding of carbides in the cobalt basis matrix the most endangered surface regions of the tools may to be better protected and the life times significantly increase compared with the up to now with conventional materials manufactured components. With manufactured and tested segments of a transverse-rolling tool it was possible to validate whether the won knowledge is transferable into the practice.
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