1. AECC Shenyang Liming AeroEngine Co., Ltd., Shenyang 110043, China
2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
3. Gui Zhou Aviation Technology Development Co., Ltd., Guiyang 550000, China
By fabricating GH2909 alloy ring forgings with different final rolling and heat treatment regimes, the precipitation behavior of the Laves phase was quantitatively characterized, and mechanical performance tests including room temperature tensile test, high temperature tensile, notch and combined fatigue test were conducted, achieving the correlation analysis of the process,microstructure and properties of GH2909 alloy ring forgings. The results demonstrate that the mechanical properties of the GH2909 alloy are strongly correlated with the precipitation behavior of the Laves phase within its microstructure. During the heat treatment, the Laves phase in the form of short rods and particles exhibits higher thermal stability. As the solution temperature increases, the lamellar Laves phase gradually dissolves into the matrix. Reducing the aspect ratio of the Laves phase can effectively improve the tensile and notched fatigue performance of alloy; the notch fatigue performance of alloy should comprehensively consider the precipitation behaviors of both the Laves phase and the ε/ε″ phase.