Abstract
Co-Cr-W-Mo alloys have been used for dental implants for many decades. Thermomechanical processing in combination with heat treatments leads to a significant improvement of the materials properties regarding application and manufacturing. During hot isostatic pressing (HIP) of the cast prematerial, a change in the chemical composition of the constituent phases occurs, which influences the susceptibility of the metastable fcc Co matrix to strain-induced martensitic transformation (SIMT). The purpose of this study was to identify the effect of the HIP process on SIMT. The local mechanical behavior of preselected grains in {111}, {110}, and {100} orientations was analyzed by nanoindentation, and the chemical composition of the primary dendrites was studied by atom probe tomography (APT). Due to HIP, the chemical composition of the matrix slightly changed, which in turn changes the fcc → hcp transformation temperature and, connected with that, the tendency to SIMT. Further, the present study revealed a slight orientation anisotropy of the Young’s modulus in the as-cast condition and a general drop in hardness after HIP.
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Acknowledgements
The authors thank Patrick Voigt and the Hanseatische Warenhandelsgesellschaft for providing the sample material. Parts of this work were also funded by the Styrian and the Tyrolean Provincial Government, represented by Steirische Wirtschaftsförderungsgesellschaft mbH and Standortagentur Tirol, within the framework of the COMET Funding Programme (837900, MPPE A7.19) is appreciated.
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Weißensteiner, I., Voigt, P., Clemens, H., Maier-Kiener, V. (2018). Strain-Induced Martensitic Transformation in a Co-Cr-W-Mo Alloy Probed by Nanoindentation. In: Stebner, A., Olson, G. (eds) Proceedings of the International Conference on Martensitic Transformations: Chicago. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-76968-4_38
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DOI: https://doi.org/10.1007/978-3-319-76968-4_38
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