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Meeting Superalloys 2021
Symposium Superalloys 2021
Presentation Title Using Rapid Thermal Annealing for Studying Early Stages of High Temperature Oxidation of Superalloys
Author(s) Dorota Kubacka, Yolita Eggeler, Nicklas Volz, Steffen Neumeier, Erdmann Spiecker
On-Site Speaker (Planned) Dorota Kubacka
Abstract Scope The great potential of Rapid Thermal Annealing (RTA), a widespread technique in semiconductor technology, for studying high-temperature properties of superalloys is demonstrated. As an application example, early stages of high-temperature oxidation of Co/Ni-base superalloys are investigated. Model alloys with different Co/Ni ratio are oxidized in synthetic dry air at 900 °C to understand the differences between the oxidation behavior of Ni- and Co-base alloys. Upon short exposure times (below 64 s), the two-phase ã/ã′ microstructure has a pronounced influence on both the morphology and growth kinetics of Al2O3 precipitates. Depending on the base element, Al2O3 nucleates in either the ã′ phase in the form of needles (Ni-base superalloy) or in the ã matrix as lath- and plate-like precipitates (Co-base superalloy) with the latter showing much slower formation kinetics. Observed differences in oxidation behavior can be directly correlated to changes in the partitioning of W, which acts as a ã former in Ni- and a ã′ former in Co-base superalloys. We propose that a significant amount of W in ã′ has an inhibitory effect on the diffusion of Al, suppressing the formation of Al2O3 in the ã′ phase of Co-base superalloys. Our approach proved to be very successful for oxidation studies and opens up new opportunities for superalloys research.
Proceedings Inclusion? Undecided

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Alloy Design and Microstructural Evolution during Heat Treatment of Newly Developed Cast & Wrought Ni-base Superalloy M647 for Turbine Disk Application
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