Research on Stress Corrosion Behavior of 316NG Steels in Liquid Lead-Bismuth Eutectic at 560℃

Zhang Pingping; Gong Bin; Zhao Yongfu; Gao Jun; Deng Ping; Wu Zongpei

doi:10.13832/j.jnpe.2024.050039

Volume 46 Issue 3

Jun. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(3): 152-159

Zhang Pingping, Gong Bin, Zhao Yongfu, Gao Jun, Deng Ping, Wu Zongpei. Research on Stress Corrosion Behavior of 316NG Steels in Liquid Lead-Bismuth Eutectic at 560℃[J]. Nuclear Power Engineering, 2025, 46(3): 152-159. doi: 10.13832/j.jnpe.2024.050039

Citation:

Zhang Pingping, Gong Bin, Zhao Yongfu, Gao Jun, Deng Ping, Wu Zongpei. Research on Stress Corrosion Behavior of 316NG Steels in Liquid Lead-Bismuth Eutectic at 560℃[J]. Nuclear Power Engineering, 2025, 46(3): 152-159. doi: 10.13832/j.jnpe.2024.050039

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Research on Stress Corrosion Behavior of 316NG Steels in Liquid Lead-Bismuth Eutectic at 560℃

doi: 10.13832/j.jnpe.2024.050039

Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-05-23
Rev Recd Date: 2024-07-07

Available Online: 2025-06-09

Publish Date: 2025-06-09

Abstract

Abstract

To precisely obtain the compatibility between austenitic stainless steel and liquid metal for the service performance evaluation, this study used a high-temperature liquid lead-bismuth eutectic slow strain rate tensile test device to investigate the stress corrosion behavior of 316NG stainless steel in 560℃ Lead-Bismuth eutectic (LBE) under three dissolved oxygen concentrations: low oxygen concentration (<7×10⁻⁸%), medium oxygen concentration (2×10⁻⁶%~2×10⁻⁷%), and saturated oxygen concentration (1.0×10⁻³%~3×10⁻⁴%). The results show that, compared with argon environment, 316NG steel exhibited stress corrosion in the LBE environment. As the dissolved oxygen concentration decreased, the crack depth increased, the fracture elongation decreased, and the stress corrosion effect became more pronounced. At low and medium oxygen concentrations, the fracture mode of 316NG steel was a mixed fracture mode which involves surface intergranular cracking and matrix ductile fracture. However, at saturated oxygen concentration, the fracture mode primarily consisted of matrix ductile fracture. The main cause of stress corrosion of 316NG steel was the inability of the specimen’s surface and crack tip to form a continuous and stable oxide film. This film is essential in preventing LBE from corroding the matrix. The interaction of LBE with the steel promotes the growth of intergranular cracks. Ultimately, it leads to premature failure of the specimen.
- 316NG,
- Lead-Bismuth eutectic,
- Stress corrosion,
- Dissolved oxygen concentration

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References(15)

References

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