Different response of cast and 3D-printed Co-Cr-Mo alloy to heat treatment: A thorough microstructure characterization

0546226 - FZÚ 2022 RIV CH eng J - Článek v odborném periodiku
Roudnická, Michaela - Bigas, J. - Molnárová, Orsolya - Paloušek, D. - Vojtěch, D.
Different response of cast and 3D-printed Co-Cr-Mo alloy to heat treatment: A thorough microstructure characterization.
Metals. Roč. 11, č. 5 (2021), č. článku 687. E-ISSN 2075-4701
Grant CEP: GA MŠMT LM2018110
Institucionální podpora: RVO:68378271
Klíčová slova: Co-Cr-Mo alloy * additive manufacturing * selective laser melting * heat treatment
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.695, rok: 2021
Způsob publikování: Open access

The Co-Cr-Mo alloy is a biomaterial widely applied for knee replacements. Its wear resistance is influenced by the amount of hcp phase and morphology of carbidic precipitates, which can both be altered by heat treatment. This study compares a conventional knee replacement manufactured by investment casting with a material prepared by the progressive technology of 3D printing. The first set of results shows a different response of both materials in increasing hardness with annealing at increasing temperatures up to the transformation temperature. Based on these results, solution treatment and subsequent aging at conditions to reach the maximum hardness was applied. Microstructural changes were studied. While increased hardness in the conventional material is caused by the precipitation of fine hard carbides combined with an increase in the hcp phase by isothermal transformation, a massive fcc → hcp transformation is the main cause for the hardness increase in the 3D-printed material.
Trvalý link: http://hdl.handle.net/11104/0322802