Haynes 282焊接接头长时热暴露后的力学性能和组织稳定性

doi:10.11896/cldb.24050002

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Abstract The nickel based high-temperature alloy Haynes 282 was welded using the hot-wire TIG welding process, followed by aging strengthening heat treatment (1 010 ℃/2 h/air cooling+(788±15) ℃/8 h/air cooling). After heat treatment, long-term thermal exposure tests with time lengths of 1 000 h, 3 000 h, 5 000 h, 8 000 h, and 10 000 h were conducted on the welded joints at the service temperature of 750 ℃. After 5 000 hour thermal exposure, μ-phase began to precipitate in the weld, and the amount of μ-phase gradually increased with further prolonged thermal exposure (up to 10 000 h). The coarsening rates of γ′-phase in both the base metal and the welded joint conformed to the Lifshitz-Slyozov-Wagner (LSW) ripening theory. After 10 000 hour thermal exposure, the impact toughness (specimen size:55 mm×10 mm×7.5 mm) decreased from 33.2 J/cm² after aging treatment to 15.6 J/cm². The mechanical properties of the welded joint first increased and then decreased with increasing thermal exposure time length. This trend can be attributed to two factors:(ⅰ) the interaction between γ′-phase and dislocations transformed from weakly coupled dislocation shearing to strongly coupled dislocation shearing; (ⅱ) the precipitation, morphology, and quantity changes of the μ-phase.

Key words： Haynes 282 thermal exposure welding evolution of microstructure mechanical property

Published: 25 July 2025 Online: 2025-07-29

CLC number:

TG444+.74

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	Articles by authors
	DIAO Wangzhan
	XU Xiangjiu
	WANG Ping
	ZHAO Weijun
	LIU Hai
	ZHANG Song

Cite this article:

DIAO Wangzhan,XU Xiangjiu,WANG Ping, et al. Mechanical Properties and Microstructural Stability of Haynes 282 Weld Joints Experienced Long-term Thermal Exposure[J]. Materials Reports, 2025, 39(14): 24050002-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24050002 OR https://www.mater-rep.com/EN/Y2025/V39/I14/24050002

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