K439B镍基铸造高温合金800 ℃长期时效过程中碳化物的演变规律

doi:10.11896/cldb.23110091

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Abstract K439B nickel-based superalloy is a new type of cast high-temperature material with a temperature bearing capacity of up to 800 ℃, which has important application prospects in large and complex structural components such as engine casings. As the main grain boundary strengthening phase in this alloy, the evolution of carbides during the long-term aging process is still unclear. This article takes K439B alloy as the object and conducts isothermal aging experiments at 800 ℃ for 6 000—10 000 h to study the evolution and transformation mechanism of carbides during long-term aging process. The results indicate that K439B alloy has excellent structural stability. After long-term aging, most of the MC type carbides in the standard heat treated state were still retained in the grain boundaries and interdendritic structures, and only a portion of the MC type carbides decomposed into M₂₃C₆-type carbides and γ' phase, no harmful phases (e.g. σ and η) were formed after long-term aging for 10 000 h. The M₂₃C₆-type carbides at grain boundaries exhibited two coarsening behaviors. On the one hand, the M₂₃C₆-type carbides gradually coarsened and had a uniform width after long-term aging;on the other hand, the coarsened M₂₃C₆-type carbides at certain grain boundaries exhibited irregular shapes and even extended towards the interior of the grains. γ′ phase separate two adjacent M₂₃C₆-type carbides, resulting in no complete connection of M₂₃C₆-type carbides along the entire grain boundaries.

Key words： K439B nickel-based superalloy long-term aging microstructure stability carbides

Published: 10 August 2024 Online: 2024-08-29

CLC number:

TG132.3

Fund:National Science and Technology Major Project of China (J2019-VI-0004-0117),Science and Technology on Advanced High Temperature Structural Materials Laboratory Fund (6142903220101) and National Key Research and Development Program of China (2022YFB3706804).

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	Articles by authors
	GAO Lei
	QU Xinghai
	WU Yidong
	CHEN Jingyang
	XIAO Chengbo
	HUI Xidong

Cite this article:

GAO Lei,QU Xinghai,WU Yidong, et al. Evolution of Carbides in K439B Nickel-based Cast Superalloy During Long-term Aging at 800 ℃[J]. Materials Reports, 2024, 38(15): 23110091-5.

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http://www.mater-rep.com/EN/10.11896/cldb.23110091 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23110091

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