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| Ertürk, Emre |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schwanekamp, Tobias
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022Impact of cobalt content and grain growth inhibitors in laser-based powder bed fusion of WC-Co
- 2019Thermal post-treatment of additively manufactured WC-Co processed by laser powder bed fusion
- 2019The impact of different binder systems in laser powder bed fusion of tungsten carbide composites
- 2018Parameter study on laser beam melting of WC-Co at 800°C pre-heating temperature
- 2017 Geometrical and topological potentialities and restrictions in selective laser sintering of customized carbide precision tools
- 2016Additive Manufacturing of application optimized tungsten carbide precision tools
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document
The impact of different binder systems in laser powder bed fusion of tungsten carbide composites
Abstract
Laser powder bed fusion (L-PBF) offers significant potentialities for the design of innovative cutting tools. Industrial applications are hitherto limited to steel alloys since laser molten carbides such as WC-Co exhibit defects like pores, cracks, eta-phases, evaporation of binder and excessive WC-grain growth. Previous research indicates that thermal cracking can be prevented by high-temperature pre-heating. However, WC-grain growth and residual η-phases remain and need countermeasures. For conventional sintering, it is well known that the formation of phases depends on the carbide-binder system and chromium-based additives are used as WC grain growth inhibitors. Therefore, a fundamental study on nickel and cobalt-chromium as alternative binder systems in L-PBF of tungsten carbides is conducted. The results are compared to those of the WC-Co system. Samples from WC-CoCr and WC-Ni powders are generated at 800°C pre-heating temperature. Analysis is undertaken with respect to mechanical properties and material defects. Furthermore , microstructure, binder evaporation, WC-grains and phase development are analyzed.