摘要
In order to meet the design requirements of the aging treatment process of a 4th generation nickel-based single crystal superalloy(Ni-SX)developed independently,the effects of aging temperatures and aging times on the precipitation and morphological evolution ofγprecipitates are studied.The morphological evolution behavior ofγprecipitates during the aging process is summarized subsequently and the coarsening behavior ofγprecipitates is discussed by comparing with the Lifshitz-Slyozov-Wagner model(LSW)and the trans-interface diffusion-controlled model(TIDC).It is demonstrated that primary aging temperature and secondary aging time dominate the size and squareness ofγprecipitates respectively,a narrow primary aging temperature range and a suitable secondary aging time are allowed to obtain the optimized morphology ofγprecipitates.The optimal aging process of the Ni-SX investigated in the present work is obtained for 1100-1120°C/4 h and 870°C/16 h,confirmed by the corresponding creep tests.The coarsening growth ofγprecipitates in short-term aging also conforms to the LSW model well.Besides,the aging process design rules of various Ni-SXs of different generations are also summarized.
基金
supported by the National Natural Science Foundation of China(No.91960201)
the Zhejiang Provincial Natural Science Foundation of China(Nos.LR22E010003,LY20E010004)
the Key Basic Research Program of Zhejiang Province(No.2020C01002)
the Fundamental Research Funds for the Central Universities(No.226-2022-00050)
the Fundamental Research Funds of the Zhejiang Provincial Universities(No.2021XZZX011)
National Science and Technology Major Project of China(No.J2019-Ⅲ-0008-0051)。
