等温氧化对GH3230合金拉伸及疲劳性能的影响

doi:10.11896/cldb.25010188

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Abstract Isothermal oxidation tests at 1 000 ℃ for 100 hours were conducted on GH3230 alloy, followed by tensile tests and low-cycle fatigue (LCF) tests at both room temperature and 700 ℃. The S-N curves of GH3230 alloy were established, and fracture surface analyses were performed. Results indicate that the dense oxide layer formed during isothermal oxidation provides effective protection for the alloy, exhibiting minimal impact on tensile properties but significantly influencing fatigue performance. Notably, it enhances room-temperature LCF life while significantly reducing high-temperature LCF life. Tensile fracture surfaces display abundant dimples, confirming ductile fracture characteristics. Larger and deeper dimples observed in high-temperature tensile specimens align with their superior plasticity. Fatigue fractures demonstrate three distinct zones:crack initiation, propagation, and final rupture. Crack initiation mechanisms involve surface layer-induced fracture and brittle carbide-induced cracking. Fatigue failure manifests as brittle fracture, with room-temperature specimens showing no edge cracks but prominent plastic slip bands, suggesting dislocation motion as the dominant deformation mechanism. Oxidized specimens exhibit intact oxide layers and increased dispersion of carbides, contributing to improved fatigue resistance. In contrast, 700 ℃ LCF specimens develop multiple secondary cracks at edges, displaying intergranular-transgranular mixed-mode propagation. The absence of plastic slip bands implies a transition in deformation mechanisms from dislocation glide to diffusion creep or grain boundary sliding. Degraded fatigue life in oxidized high-temperature specimens correlates with oxide layer spallation and carbide coarsening.

Key words： low-cycle fatigue GH3230 nickel-based superalloy isothermal oxidation oxide layer fatigue fracture mechanism

Published: Online: 2026-02-13

CLC number:

TG14

Corresponding Authors: caorui@lut.edu.cn

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	WANG Lisha
	CAO Rui
	ZHANG Yawei
	ZHANG Ji

Cite this article:

WANG Lisha,CAO Rui,ZHANG Yawei, et al. Effects of Isothermal Oxidation on the Tensile and Fatigue Properties of GH3230 Alloy[J]. Materials Reports, 2026, 40(3): 25010188-9.

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https://www.mater-rep.com/EN/10.11896/cldb.25010188 OR https://www.mater-rep.com/EN/Y2026/V40/I3/25010188

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