Abstract:The crack propagation performance of the independently developed 3rd generation powder high-temperature alloy FGH4113A was studied, including the effects of preparation process, temperature, and frequency on crack propagation performance, and a comparison was made with similar high-temperature alloys internationally. The preparation process involved a combination of Hot Isostatic Pressing (HIP), Hot Extrusion (HEX), Isothermal Forging (ITF), and Heat Treatment (HT). Test temperatures included room temperature, 650°C, and 700°C, with test frequencies of 0.33Hz and 20Hz, analyzing the impact of frequency on the alloy"s high-temperature crack propagation performance. The comparison included similar alloy grades such as FGH95, FGH96, FGH97, FGH98, ME3, and LSHR. The results show that ppb and coarse primary γ′ phase around the grain boundary are unfavorable factors for the crack growth performance of the alloy, and increasing the grain size of the alloy is beneficial to reducing the crack growth rate. Extrusion and forging process can effectively eliminate PPB, thereby enhancing the alloy"s crack propagation resistance. The crack growth rate at room temperature is much lower than that at 650 ℃ and 750 ℃, and the crack growth rate at 0.33hz test frequency is significantly higher than that at 20Hz. Increasing the temperature and decreasing the test frequency will increase the crack growth rate of the alloy. In the stable crack propagation stage, the ITF state FGH4113A alloy exceed FGH98, LSHR and ME3 alloys, and reach the advanced level of the 3rd Powder Superalloy.