Numerical Simulation of Solidification Process on Single Crystal Ni-Based Superalloy Investment Castings

布里奇曼投资铸造物的方向性的团结是为可靠、高度有效的煤气的汽轮机 blades.In 的生产的 keytechnology 这份报纸， amathematical 模型为三维( 3D )单个 crystalinvestment 铸造物的团结过程的模拟基于多重片铸造物和炉子墙在 superalloy investme 在 model.Temperaturedistribution 和温度坡度被考虑的基本的热转移 equations.Complex 热 radiationamong

Bridgman directional solidification of investment castings is a key technology for the production of reliable and highly efficient gas turbine blades. In this paper, a mathematical model for three-dimensional （3D） simulation of solidification process of single crystal investment castings was developed based on basic heat transfer equations. Complex heat radiation among the multiple blade castings and the furnace wall was considered in the model. Temperature distribution and temperature gradient in superalloy investment castings of single blade and multiple ones were investigated, respectively. The calculated cooling curves were compared with the experimental results and agreed well with the latter. It is indicated that the unsymmetrical temperature distribution and curved liquid-solid interface caused by the circle distribution of multiple turbine blades are probably main reasons why the stray grain and other casting defects occur in the turbine blade.