Abstract
The objective of this study is to process a bimaterial that combines the mechanical strength of a martensitic steel (X3CrNiMo13-4) and the wear and corrosion resistance of a cobalt base alloy (Stellite 6). The powder metallurgy route includes three steps: co-compaction, debinding, and pressureless co-sintering. The experimental approach consists in studying the compaction, the debinding and the sintering behavior of single materials (dimensional changes during sintering, microstructure, and hardness after sintering) before studying co-sintering. The co-sintering temperature range is defined from thermo-chemical calculations and single material sintering experiments especially for Stellite 6. Finally, the co-sintering ability is evaluated (green and final densities, shrinkage mismatch, coefficient of thermal expansion…) and the bimaterial sintering is studied. Despite the shrinkage mismatch of single materials, cohesion is achieved between the two materials through the infiltration of the supersolidus liquid from the Co base alloy to the steel and through the formation of an interdiffusion layer between the two materials characterized by a composition gradient.
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Acknowledgements
The authors wish to thank Florence Doré and Paul Calves from CETIM (Saint Etienne, France) for compaction experiments. They acknowledge Direction Générale des Entreprises, Conseil Général de la Loire, Saint Etienne Métropole, and CETIM Foundation for their financial support.
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Pascal, C., Thomazic, A., Antoni-Zdziobek, A. et al. Co-sintering and microstructural characterization of steel/cobalt base alloy bimaterials. J Mater Sci 47, 1875–1886 (2012). https://doi.org/10.1007/s10853-011-5976-8
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DOI: https://doi.org/10.1007/s10853-011-5976-8