基于Oyane-Sato准则的GH4169合金高温断裂行为研究

doi:10.11896/cldb.25010099

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Abstract GH4169 superalloy with varying initial δ phases was obtained through different heat treatments, the influence of aging processes on the microstructure of the alloy was investigated using optical microscopy (OM) and scanning electron microscopy (SEM). Results show that as the aging time extends, the morphology of δ phase in the alloy changes significantly, extending from grain boundaries into the grain interior and transforming from a short rod shape to a long needle shape. High-temperature tensile tests were conducted on GH4169 alloys with different initial microstructures, the elongation of the alloy exhibits a trend of increasing first and then decreasing, while the ultimate tensile strength and yield strength gradually increase. Among them, GH4169 aged for 9 hours demonstrates the highest ultimate tensile strength and a relatively good fracture elongation. Furthermore, high-temperature tensile tests were conducted on the alloy aged for 9 hours under conditions of 920 ℃ to 1 010 ℃ and strain rates of 0.001 s^-1 to 0.01 s^-1, with an in-depth investigation of its high-temperature damage behavior. Under the same conditions, the higher the strain rate, the higher the yield strength of the material, while the higher the temperature, the lower the yield strength. Based on the Oyane-Sato damage criterion, a high-temperature damage model of the alloy was constructed, and the predicted damage values are in good agreement with the experimental results, indicating that the established damage model can accurately predict the high-temperature fracture da-mage behavior of GH4169 alloy. The research findings provide a reliable theoretical basis for optimizing the hot forming process of nickel-based alloys.

Key words： GH4169 alloy high-temperature tensile damage model Oyane-Sato criterion

Published: 10 January 2026 Online: 2026-01-09

CLC number:

TG132

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	YI Shifeng
	CHEN Xiaomin

Cite this article:

YI Shifeng,CHEN Xiaomin. Prediction of High-temperature Tensile Fracture Behavior of GH4169 Alloy Based on the Oyane-Sato Criterion[J]. Materials Reports, 2026, 40(1): 25010099-7.

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https://www.mater-rep.com/EN/10.11896/cldb.25010099 OR https://www.mater-rep.com/EN/Y2026/V40/I1/25010099

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