| Abstract Scope |
Ni-based single-crystal superalloys, mostly used in turbine blade applications, are inherently anisotropic and usually cast in the direction. Any slight misorientations result in anomalies in the microstructural evolution, thereby, causing variation in the mechanical response. As the stability of the microstructure dictates the structural integrity of the blade, it is essential to understand the microstructural state as a function of the crystallographic orientation. Therefore, to predict the microstructural evolution of single-crystal superalloys at any given orientation on the standard stereographic triangle, a crystallographic-sensitive phase-field model was developed. The phase-field simulations for the perfect , , and orientations agreed well with the experimental characterizations. For the first time, a model also predicts the microstructures for misorientations (10°) away from the main crystallographic directions. Finally, for a quantitative assessment of the macroscale performance of various orientations, the 3D phase-field microstructures were employed to carry out crystal-plasticity finite-element (CPFE) micromechanical simulations for strain-controlled monotonic tensile tests at 1050°C. |