Abstract
The carbides reinforcing cast superalloys are the most often chromium carbides or tantalum carbides (TaC), the second ones being preferred for very high temperature. In this work, three chromium-rich alloys based on Fe, Ni and Co, containing either TaC carbides in unusually high quantity, or unusual HfC carbides were cast and subjected to 3-points bending tests at 1200°C under constant load in order to specify and compare their creep behavior under 20 MPa. The best alloy in this field appeared to be the cobalt-based one reinforced with interdendritic eutectic HfC carbides. After comparison with a Co-25Cr-0.5C-7.5Ta alloy, known for its high strength at 1200°C, this alloy confirmed its great interest for uses at elevated temperature under flexural or tensile stress.
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