In recent years

with the complexity of the gas-cooled structure and the large-scale size of the single-crystal turbine blade

the production of single-crystal blade is more prone to crystal selection failure

orientation deviation

sliver

large angle grain boundary

stray grain in the platform

recrystallization

freckles and other defects

which lead to the reduction of high-temperature alloy performance of single crystal turbine blade

and eventually cause the scrapping of single-crystal blade. In order to reduce these defects in single crystal blade

improve the quality of single crystal

and obtain a complete structure of single crystal structure

it is very important to be familiar with various common defects in the production of single crystal blade

realize the formation rules of defects

and master the defect inhibition technology. On this basis

the common solidification defects in the production of single crystal blades

as well as the formation rules and inhibition methods of solidification defects were systematically introduced

which lays a solid theoretical foundation for reducing the defects of single crystal blades and improving the quality and qualification rate of blades

and provides a strong technical support.