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Schwanekamp, Tobias
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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
Thermal post-treatment of additively manufactured WC-Co processed by laser powder bed fusion
Abstract
Additive manufacturing of composite carbides offers significant potentialities for the design of innovative cutting tools. In contrast to classical sintering, laser powder bed fusion (L-PBF) is subject to a highly localized energy input and thermal exposure times in the order of microseconds. As a result, laser molten WC-Co is characterized by a heterogeneous microstructure inclosing pores, cracks, brittle and meta-stable material phases and WC grain growth. High-temperature pre-heating of the build platform can be applied to reduce thermal gradients during the L-PBF process. Results show that thermal cracking in laser molten WC-Co can be prevented, but that residual pores and microstructure heterogeneities remain. Thermal processes subsequent to the L-PBF process are promising for improvement of these deficits. This study analyses and evaluates the effect of sinter-HIP post-treatment on microstructure and material properties of laser molten WC-Co. As a result, relative densities close to 100 percent are achieved.