Stress Relaxation Behavior at Medium Temperature and Creep Constitutive Equation Modification of GH4169 Alloy

MA Qin; YU Wenhao; CHAI Yijun; YANG Xiongwei; LI Yueming

doi:10.11973/jxgccl230619

Materials and Mechanical Engineering > 2024 > 48(12): 112-120. > DOI: 10.11973/jxgccl230619

MA Qin, YU Wenhao, CHAI Yijun, YANG Xiongwei, LI Yueming. Stress Relaxation Behavior at Medium Temperature and Creep Constitutive Equation Modification of GH4169 Alloy[J]. Materials and Mechanical Engineering, 2024, 48(12): 112-120. DOI: 10.11973/jxgccl230619

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Stress Relaxation Behavior at Medium Temperature and Creep Constitutive Equation Modification of GH4169 Alloy

1.
China Nuclear Power Engineering Co., Ltd., Beijing 100840, China
2.
School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China

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Received Date: December 26, 2023
Revised Date: October 09, 2024

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Abstract

The stress relaxation tests were carried out for GH4169 alloy at temperatures of 450–550 ℃, time of 600 h and initial stress of 800 MPa, and the stress relaxation behavior was analyzed. The relationship between stress and time was fitted by using the cubic delay function. The threshold stress was introduced to modify the Arrhenius creep constitutive model. The stress relaxation curves were obtained by unmodified and modified models and were compared with the test results. The results show that the remaining stress of GH4169 alloy after stress relaxation tests first decreased and then increased with the increase of temperature, and the stress relaxation amounts at 450,500,550 ℃ were about 12,18,15 MPa, respectively. The constructed cubic delay function could accurately describe the relationship between stress and time of GH4169 alloy, with the fitting correlation coefficients all greater than 0.999. The stress relaxation curves of GH4169 alloy at medium temperature simulated by modified Arrhenius model with introducing threshold stress were in good agreement with the test results, with the maximum relative error of 0.02%. The stress relaxation curves simulated at 500 ℃ and 550 ℃ based on unmodified Arrhenius model had a larger deviation from the test results, and the maximum relative error was 0.1%. The modified Arrhenius model could better predict the stress relaxation behavior of GH4169 alloy at medium temperature.
- GH4169 alloy,
- medium temperature stress relaxation,
- creep constitutive model,
- delay function,
- threshold stress

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