Modeling of Precipitation Kinetics of TCP-Phases in Single Crystal Nickel-Base Superalloys

Abstract:

The precipitation of brittle so-called TCP-phases is critical for the application of Re-containing single crystal superalloys. In this work a fully multicomponent precipitation model is presented, which is capable of simulating the precipitation process of the TCP-phases in superalloys considering complex precipitation sequences with several metastable phases. The model is coupled to multicomponent thermodynamic CALPHAD calculations and relies on multicomponent diffusion models based on the TC-API interface of the software DICTRA. The required mobility database has been newly developed and covers all relevant alloying elements of the Ni-base superalloys including rhenium (Re) and ruthenium (Ru). It is well known that adding Ru strongly reduces TCP-phase precipitation. Based on the developed precipitation model, possible mechanisms are investigated to explain this effect and it is concluded that Ru mostly influences the nucleation rate by a combined influence on interface energy, “reverse partitioning” and γ’-phase fraction.

• Periodical: Advanced Materials Research (Volume 278)
• Pages: 180-185
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.278.180
• Online since: July 2011
• Authors: Ralf Rettig, Astrid Heckl, Robert F. Singer
• Keywords: CALPHAD, DICTRA, Precipitation Model, Rhenium, Ruthenium, Superalloy, ThermoCalc

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