Work

Influence and regulation strategy of crystal orientation on residual stress and displacement field in single-crystal turbine blades

Year: 2026

Type: article

Abstract: The fabrication of single-crystal turbine blades necessitates simultaneous and stringent control of dimensional accuracy and metallurgical quality. However, studies about influence of crystal orientations on the residual stress and dimensional accuracy of entire blades are limited. This paper systematically addressed the influence of primary and secondary orientation on the residual stress and displacement field. In this work, stress and displacement field were simulated based on ProCAST software, the crystal orientations were controlled by single-crystal substrate stimulating technique. The deviation angles selected for primary orientation [0 0 1] (α) were 0°, 6°, and 12°, respectively. The deviation angles for secondary orientation [1 0 0] (β) were nine discrete orientations designated at 10° intervals relative to longitudinal axis of the platform. The blade with primary orientation deviation of 6° demonstrates the smallest residual stress and smallest maximum deformation, whereas the case with deviation of 0° exhibits the largest. And the blade with secondary orientation deviation of 30° exhibited satisfactory results. Then, a regulation strategy employing α = 6°, β = 30° yielded significant improvements, of which residual stress decreased by 450 MPa, and maximum deformation decreased by 50%. This strategy demonstrated a certain extent effectiveness across another blade. Finally, exploratory analysis was conducted on the influence of crystal orientation on residual stress and displacement fields

Source: Materials & Design

DOI: 10.1016/j.matdes.2026.116807