Effects of post-processing on microstructure and mechanical properties of Laser powder bed fusion -processed GH4099

The GH4099 Superalloy, a nickel-based material, is widely deployed in aerospace and power industries owing to its exceptional high-temperature strength and thermal stability. However, defects inherent to laser powder bed fusion (LPBF) and resultant mechanical anisotropy significantly constrain its broader application. This study delves into the impact of subsequent heat treatment on the microstructure of GH4099 Superalloy produced via LPBF. It explores the origins of mechanical property anisotropy and strategies for its elimination. Hot Isostatic Pressing (HIP) treatment eliminates anisotropy in mechanical properties by eliminating defects, anisotropy in grain morphology, and texture problems. Finally, isotropic mechanical properties are obtained. This research offers promising avenues for eliminating material anisotropy and enhancing the overall mechanical properties of the alloy.