Exploration of directional solidification optimization for large-sized gas turbine blades

A dummy blade that facilitates the observation of grain boundary deviation angle is designed to explore the process optimization for adapting to the directional solidification process of large-sized blades. The withdrawing speed, holding temperature, and casting temperature have been extensively studied as the main process parameters, and their relationships have been also discussed. The optimal process parameters suitable for controlling deviation are explored. The research results show that in addition to the withdrawing speed, the casting temperature is also an important factor affecting deviation, and its effect is nonlinear. The rationality of the coupled temperature conditions obtained in the end has been explained based on existing models. The research results will provide a reference for controlling columnar grain boundary deviations for the turbine blade, especially for large-scale directional solidification.