长期时效对镍铁基高温合金组织和冲击韧性的影响

doi:10.11896/cldb. 23050036

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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.

Key words： Ni-Fe based superalloy long-term exposure microstructural stability impact toughness

Published: Online: 2024-10-12

CLC number:

TG141

Fund:This work was financially supported by the Science & Technology Foundation of Huaneng Group Co., Ltd. (HNKJ20-H41), Research & Development Funds of Xi’an Thermal Power Research Institute Co., Ltd. (TA-20-TYK03, TA-23-TYK04), National Natural Science Foundation of China (52271070), Natural Science Basic Research Program of Shaanxi(2023-JC-QN-0406).

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	Articles by authors
	LI Limin
	DANG Yingying
	HUANG Jinyang
	LIU Peng
	LI Pei
	LU Jintao
	YUAN Yong

Cite this article:

LI Limin,DANG Yingying,HUANG Jinyang, et al. Effect of Long-term Heat Treatment on the Microstructure and Impact Toughness of a New Ni-Fe Based Superalloy[J]. Materials Reports, 2024, 38(18): 23050036-6.

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http://www.mater-rep.com/EN/10.11896/cldb. 23050036 OR http://www.mater-rep.com/EN/Y2024/V38/I18/23050036

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