Abstract
Cast high entropy CoNiFeMnCr alloys can become alternative solutions to cast cobalt-based and nickel-based superalloys able to resist creep at 1000 °C and beyond. The partial substitution of Co and Ni by Fe and Mn allows lower cost and lower dependence on the Co and Ni critical elements. However, their grain boundaries need to be strengthened. In this work, equimolar CoNiFeMnCr alloys were elaborated by high-frequency induction melting under inert atmosphere, after having added carbon and either Ta or Hf, in quantities rated to favor the development of an intergranular network of script-like eutectic carbides, either TaC or HfC. These carbides were successfully obtained with the required location and morphology. 3 points bending creep tests were carried out at 1100 °C for an induced maximal tensile stress equal to 20 MPa. Interesting resistance was noted for some of these alloys, taking into account the high levels of applied stress and temperature.
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Acknowledgements
The authors wish thank Lionel Aranda for his great help for performing the creep tests.
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Berthod, P. (2023). Strengthening Against Creep at Elevated Temperature of HEA Alloys of the CoNiFeMnCr Type Using MC-Carbides. In: TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22524-6_102
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DOI: https://doi.org/10.1007/978-3-031-22524-6_102
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