高温合金超限构件精密铸造技术及发展趋势

Superalloy casting is an important hot component in major aerospace equipment. It is being developed for larger and more complex structures and thinner wall thickness than traditional superalloy casting. The requirements of its internal metallurgical quality and external dimensional accuracy are becoming increasingly stringent, gradually exceeding the manufacturing limit of traditional investment casting technology. Shrinkage porosity defect control, thin-walled complete filling, dimensional accuracy, and surface quality control have become key challenges in the manufacturing of large and complex thin-walled superalloy castings. This paper systematically summarizes the research status of the superalloy casting process design, mold shell preparation, whole process dimensional accuracy, and adjusted pressure casting technique at home and abroad. This paper also analyzes and predicts the development trend of intelligent casting based on big data.