1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870
2. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142
3. Beijing Institute of Aeronautical Material, Beijing 100095
Cite this article:
ZHANG Shu, TIAN Sugui, YU Huichen, YU Lili, YU Xingfu. MICROSTRUCTURE EVOLUTION AND FEM ANALYSIS OF [111] ORIENTED SINGLE CRYSTAL OF A NICKEL-BASED SUPERALLOY DURING TENSILE CREEP. Acta Metall Sin, 2012, 48(5): 561-568.
Abstract The distribution of von Mises stress and strain energy density in regions near interfaces of γ/γ' phases was calculated by an elastic--plastic stress--strain finite element method (FEM), and the influences of applied stress on the von Mises stress distribution and coarsening regularity of γ' phase in a [111] oriented single crystal nickel--based superalloy were also investigated. The results show that, after heat treated, the microstructure of the [111] oriented single crystal superalloy consists of a cubical γ' phase embedded coherently in γ matrix, and the cubical γ' phase is regularly arranged along <100> direction. When tensile stress is applied along [111] direction, compared to (010)γ' plane, larger expanding lattice strain occurs on (100)γ' and (001)γ' planes under the action of principal stress component, which may trap Al, Ti atoms with bigger radius to promote γ' phase directionally growing along [010] and [100] orientations on (010) plane, this is thought to be the main reason of γ' phase grown directionally into a mesh--like rafted structure along (010) plane.
