Numerical simulation of gamma/gamma ' microstructural evolutions induced by TCP-phase in the MC2 nickel base single crystal superalloy

作者：le Graverend J B^*; Cormier J; Caron P; Kruch S; Gallerneau F; Mendez J

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(6): 2620-2634.

DOI：10.1016/j.msea.2010.11.081

• Nickel base single crystal superalloy
• mu-Phase
• Creep
• Microstructural evolution
• Numerical simulation
• Crystal plasticity model

The influence of topologically close packed-phase (TCP-phase) precipitation on the gamma/gamma' microstructure evolution of a single crystal superalloy has been studied. Four representative configurations of needle-shaped mu-phase particles observed in the MC2 alloy after creep deformation at 1050 degrees C/160 MPa have been selected.
Finite element modeling was performed on the selected configurations using a crystal plasticity framework and a viscoplastic approach.
The local calculated stress/strain fields in the vicinity of TCP-phase precipitates, especially stress concentration, allow an interpretation of the observed microstructural evolutions (gamma'-precipitate orientation and thickness).
Moreover, our numerical simulation brings a fruitful contribution to the understanding of the phenomenon often observed beyond needle-like mu-phase: the formation of a distorted gamma/gamma' microstructure in lieu of the expected gamma/gamma'-rafted structure.

• 出版日期2011-3-15