GH4099 高温合金激光粉末床熔融制备技术研究进展

As a representative γ'-strengthened nickel-based superalloy, GH4099 is widely used in hot-end components under extreme service environments such as aviation, aerospace, and nuclear due to its excellent high-temperature performance, thermal stability, corrosion resistance, as well as fatigue resistance and fracture toughness. Laser powder bed fusion (LPBF) technique has effectively solved the technical bottlenecks such as prolonged processing cycle, insufficient process synergy, low material utilization, and high cost in the forming process of complex components by the traditional manufacturing technique. This review presents a comprehensive overview of the recent advancements in LPBF technique for the formation of GH4099 and delved into various aspects of GH4099 superalloys prepared by LPBF, including its technical principles, solidification defects, microstructure, and high-temperature mechanical properties. Furthermore, it focused on the influence of powder characteristics, process parameters, post-treatment techniques (including heat treatment and hot isostatic pressing technique), and other factors on the solidification defects and high-temperature mechanical properties of GH4099 superalloys prepared by LPBF. Finally, it summarized and outlined the application potential and development trends of this technique in future manufacturing.