Abstract: High-parameter ultra-supercritical unithas been the core research and development direction of future thermal power technology, and the new Ni-Fe based superalloy HT650T(GH4650T)is an important candidate material for superheater and reheater of 650 ℃ grade unit. In this work, the unstressed exposure tests were conducted at 650 ℃ and 700 ℃ for 0—10 000 h, respectively. The microstructure evolution of the strengthening phases, intergranular and grain boundary carbides and the trend of impact toughness at room temperature during aging process were analyzed. The results showed that the coarsening of γ′ phase was controlled by the diffusion of the matrix elements, and the growth kinetics followed the Lifshitz-Slyozov-Wagner ripening law. The grain boundary MX phase did not change significantly with the aging time, and the precipitation of M23C6 increased and widened. The grain boundary carbide remained discontinuous at 10 000 h after thermal exposure, and no harmful precipitates were found. The decrease of impact toughness at room temperature was related to the coarsening of crystal boundary carbide, and the impact toughness tended to stabilize in the later stage of aging, indicating that HT650T has good stability in microstructure and properties. The research can provide theoretical and experimental basis for engineering application of HT650T alloys.
李力敏, 党莹樱, 黄锦阳, 刘鹏, 李沛, 鲁金涛, 袁勇. 长期时效对镍铁基高温合金组织和冲击韧性的影响[J]. 材料导报, 2024, 38(18): 23050036-6.
LI Limin, DANG Yingying, HUANG Jinyang, LIU Peng, LI Pei, LU Jintao, YUAN Yong. Effect of Long-term Heat Treatment on the Microstructure and Impact Toughness of a New Ni-Fe Based Superalloy. Materials Reports, 2024, 38(18): 23050036-6.
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2024, Vol. 38 
