1 High Temperature Materials Research Division, Central Iron and Steel Research Institute, Beijing 100081, China 2 College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China
Evolution of c0 precipitates in GH4742 superalloy based on complete forging-heat treatment process
1 High Temperature Materials Research Division, Central Iron and Steel Research Institute, Beijing 100081, China 2 College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China
摘要 The temperature changes at the rim, 1/2 radius, and bore of the turbine disk during the solution treatment were measured. Based on the measured temperature data, solution treatment experiments with different cooling rates (14, 51, and 93 ℃/ min) were performed, and the solution temperatures were 1120 and 1080 ℃. At all three cooling rates, the multimodal size distribution of c0 precipitates was detected, and the size of c0 precipitates is inversely related to the cooling rate. Only the secondary and tertiary c0 precipitates were found at a solution temperature of 1120 ℃, and the secondary c0 precipitates progressed from spherical (93 and 51 ℃/min) to flower-like (14 ℃/min) shape, with the flower-like c0 precipitates regulated by aggregation. At a solution temperature of 1080 ℃, the c0 precipitates evolve from cuboids (93 and 51 ℃/min) to irregular shapes (14 ℃/min). Irregular c0 precipitates are affected by the lattice mismatch between the matrix and the c0 precipitates.
Abstract：The temperature changes at the rim, 1/2 radius, and bore of the turbine disk during the solution treatment were measured. Based on the measured temperature data, solution treatment experiments with different cooling rates (14, 51, and 93 ℃/ min) were performed, and the solution temperatures were 1120 and 1080 ℃. At all three cooling rates, the multimodal size distribution of c0 precipitates was detected, and the size of c0 precipitates is inversely related to the cooling rate. Only the secondary and tertiary c0 precipitates were found at a solution temperature of 1120 ℃, and the secondary c0 precipitates progressed from spherical (93 and 51 ℃/min) to flower-like (14 ℃/min) shape, with the flower-like c0 precipitates regulated by aggregation. At a solution temperature of 1080 ℃, the c0 precipitates evolve from cuboids (93 and 51 ℃/min) to irregular shapes (14 ℃/min). Irregular c0 precipitates are affected by the lattice mismatch between the matrix and the c0 precipitates.
Qiang Tian,He-yong Qin,Wen-yun Zhang, et al. Evolution of c0 precipitates in GH4742 superalloy based on complete forging-heat treatment process[J]. Journal of Iron and Steel Research International, 2022, 29(11): 1873-1885.
2022, Vol. 29 
