Dimensional Control of Nickel-Based Single Crystal Turbine Blade Investment Casting by Process Control Optimization

The main research is aimed at the deformation control of single crystal turbine blade margin plate. The measurement data and numerical results of margin plate are compared. The previous research indicates that the margin plate warpage deformation is related to the directional solidification structure and process parameters. However, the margin plate structure is designed by experience and usually the structure can not be changed. Thus, an optimizing method for the process parameters is put forward to control the deformation of blade margin plate. The characterization model for describing the margin plate warpage deformation is established by using analytic hierarchy process method. The chill plate temperature, shell mould preheating temperature, pouring temperature and withdraw rate are selected as the main process parameters to control the margin plate warpage deformation. Using the process optimization, the margin plate warpage deformation is reduced from 0.232295 to 0.181698 mm, decreasing 21.8%.