Progress on modeling and simulation of directional solidification of superalloy turbine blade casting

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Progress on modeling and simulation of directional solidification of superalloy turbine blade casting建模与仿真研究进展 高温合金定向凝固 涡轮叶片铸件
Abstract: Directional solidified turbine blades of Ni-based superalloy are widely used as key parts of the gas turbine engines. The mechanical properties of the blade are greatly influenced by the final microstructure and the grain orientation determined directly by the grain selector geometry of the casting. In this paper， mathematical
models were proposed for three dimensional simulation of the grain growth and icrostructure evolution indirectional solidification of turbine blade casting. Ray-tracing method was applied to calculate the temperaturevariation of the blade. Based on the thermo model of heat transfer， the competitive grain growth within the starterblock and the spiral of the grain selector， the grain growth in the blade and the icrostructure evolution weresimulated via a modified Cellular Automaton method. Validation experiments were carried out， and the measuredresults were compared quantitatively with the predicted results. The simulated cooling curves and icrostructurescorresponded well with the experimental results. The proposed models could be used to predict the grainmorphology and the competitive grain evolution during directional solidification.
Key words: Ni-based superalloy; microstructure; directional solidification; modeling