Modeling of precipitation kinetics of TCP-phases in single crystal nickel-base superalloys

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Rettig R, Heckl A, Singer R
Zeitschrift: Advanced Materials Research
Jahr der Veröffentlichung: 2011
Band: 278
Seitenbereich: 180-185
ISSN: 1022-6680
Sprache: Englisch


Abstract


The precipitation of brittle so-called TCP-phases is critical for the application of Recontaining 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 ?'-phase fraction. © (2011) Trans Tech Publications, Switzerland.



FAU-Autoren / FAU-Herausgeber

Rettig, Ralf Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Rettig, R., Heckl, A., & Singer, R. (2011). Modeling of precipitation kinetics of TCP-phases in single crystal nickel-base superalloys. Advanced Materials Research, 278, 180-185. https://dx.doi.org/10.4028/www.scientific.net/AMR.278.180

MLA:
Rettig, Ralf, Astrid Heckl, and Robert Singer. "Modeling of precipitation kinetics of TCP-phases in single crystal nickel-base superalloys." Advanced Materials Research 278 (2011): 180-185.

BibTeX: 

Zuletzt aktualisiert 2018-17-10 um 05:00