基于GTN模型的GH4698合金高温损伤演化研究

doi:10.11896/cldb.25030031

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Abstract The hot tensile behavior of GH4698 alloy was investigated within the temperature range of 1 000—1 150 ℃ and at strain rates between 0.001 and 0.01 s^-1. The influence of deformation process parameters on the flow stress was systematically examined. The results indicate that the flow stress exhibits a positive correlation with strain rate under constant deformation temperature, whereas it decreases with increasing temperature under a fixed strain rate. Furthermore, fractographic analysis reveals that the deformation parameters significantly affect the microstructural evolution of the GH4698 alloy. As the temperature increases and the strain rate decreases, the volume fraction of dynamically recrystallized (DRX) grains at the fracture surface increases. Simultaneously, both the number and volume fraction of voids at the fracture site are also eleva-ted. To characterize the high-temperature tensile fracture behavior, a Gurson-Tvergaard-Needleman (GTN) damage model was established. A strong correlation between the experimental and predicted true stress-strain curves demonstrate the high predictive accuracy of the developed GTN model for the investigated superalloy.

Key words： GH4698 alloy high temperature tensile damage GTN model

Published: 25 April 2026 Online: 2026-05-06

CLC number:

TG146.1+5

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	Articles by authors
	GAO Jing
	CHEN Xiaomin

Cite this article:

GAO Jing,CHEN Xiaomin. The High-temperature Damage Evolution Study of GH4698 Alloy Based on the GTN Model[J]. Materials Reports, 2026, 40(8): 25030031-10.

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https://www.mater-rep.com/EN/10.11896/cldb.25030031 OR https://www.mater-rep.com/EN/Y2026/V40/I8/25030031

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