高温合金熔模精密铸造技术研究进展OA

Superalloys are widely applied in the aerospace industry and gas power generation fields due to the excellent their superior high-temperature properties.Superalloys are engi-neered to operate in extreme environments characterized by elevated temperatures,high pressures,severe corrosive conditions and intense mechanical stresses.These demanding service conditions impose rigorous requirements on the dimensional fidelity,microstructural homogeneity and mechanical integrity of the components.Owing to its distinct advantages in near-net-shape forming,superior dimensional accuracy and capability to fabricate intricate geometries,investment casting has emerged as a predominant manufacturing route for su-peralloy components.This paper systematically reviews the main process types of superalloy precision casting,including equiaxed grain investment precision casting,directional solidifi-cation casting and single crystal casting.The core principles and recent research break-throughs of each process are emphatically analyzed.The formation mechanisms and regula-tion strategies of common defects generated during superalloy precision casting are summa-rized.Finally,the current technical bottlenecks are clarified and future research directions are prospected.This study provides a valuable reference for the technological development of high-performance superalloy casting.