Abstract
New low-density single-crystal (IDS) alloys have been developed for turbine blade applications, which have the potential for significant improvements in the thrust-to-weight ratio over current production superalloys. An innovative alloying strategy was used to achieve alloy density reductions, high-temperature creep resistance, micro-structural stability, and cyclic oxidation resistance. The alloy design relies on molybdenum as a potent, lower-density solid-solution strengthener in the nickel-based superalloy. Low alloy density was also achieved with modest rhenium levels and the absence of tungsten. Microstructural, physical, mechanical, and environmental testing demonstrated the feasibility of this new IDS superalloy design.
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MacKay, R.A., Gabb, T.P., Smialek, J.L. et al. A new approach of designing superalloys for low density. JOM 62, 48–54 (2010). https://doi.org/10.1007/s11837-010-0011-0
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DOI: https://doi.org/10.1007/s11837-010-0011-0