Elimination of the Stray Grain Defects of Single Crystal Blade by Variable Wall Thickness Based on Integral Ceramic Mold

The stray grain defect is often found at the platform in process of directional solidification single crystal blades because local undercooling easily occurs this area. A variable wall thickness mold based on stereolithography and gelcasting technology was proposed to solve platform. influence temperature field during studied via simulation. numerical simulation results show that can effectively prevent heat dissipation platform, thereby reducing avoiding formation grains. At same time, molds assembly angle grains analyzed, appropriate suggested.