Effect of Fe+Cr and Si Contents on Corrosion Resistance of Zircaloy-4

Yue Huifang; Pang Hua; Gao Bo; Gao Shixin; Luo Qianqian; Zhao Yanli; Jiang Yourong

doi:10.13832/j.jnpe.2024.03.0146

Volume 45 Issue 3

Jun. 2024

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Article Navigation > Nuclear Power Engineering > 2024 > 45(3): 146-153

Yue Huifang, Pang Hua, Gao Bo, Gao Shixin, Luo Qianqian, Zhao Yanli, Jiang Yourong. Effect of Fe+Cr and Si Contents on Corrosion Resistance of Zircaloy-4[J]. Nuclear Power Engineering, 2024, 45(3): 146-153. doi: 10.13832/j.jnpe.2024.03.0146

Citation:

Yue Huifang, Pang Hua, Gao Bo, Gao Shixin, Luo Qianqian, Zhao Yanli, Jiang Yourong. Effect of Fe+Cr and Si Contents on Corrosion Resistance of Zircaloy-4[J]. Nuclear Power Engineering, 2024, 45(3): 146-153. doi: 10.13832/j.jnpe.2024.03.0146

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Effect of Fe+Cr and Si Contents on Corrosion Resistance of Zircaloy-4

doi: 10.13832/j.jnpe.2024.03.0146

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
State Nuclear Bao Ti Zirconium Industry Company, Shaanxi Key Laboratory of Nuclear Grade Zirconium Material, Baoji, Shaanxi, 721013, China

Received Date: 2023-11-08
Rev Recd Date: 2024-01-23
Publish Date: 2024-06-13

Abstract

Abstract

In order to optimize the corrosion resistance of domestic Zr-4 alloy, the effects of alloying element Fe+Cr and impurity element Si on the corrosion resistance of domestic Zr-4 alloy were studied under the accelerated corrosion condition of high temperature and high pressure steam at 420℃ and 10.3 MPa. The results show that within the range of Fe+Cr content specified by ASTM (0.28 wt%-0.37 wt%, with wt% representing mass percentage), the higher the Fe+Cr content, the larger the number and size of the precipitated second phases, which is beneficial to the improvement of the corrosion resistance of the material. When the content of Fe+Cr increases from 0.28 wt% to 0.37 wt%, the corrosion weight gain of Zr-4 alloy decreases by about 30% after 126 d of corrosion in steam at 420℃. When the Si content of Zr-4 alloy is as low as 10 mg/kg during quenching at 1100℃, the coarse parallel-plate structure is formed. When the Si content is increased to 100 mg/kg, the precipitated fine Zr₃Si provides nucleation sites for α phase, which leads to the appearance of basketweave structure and fine parallel-plate structure in the microstructure. The basketweave structure can promote the distribution of the second phase in the structure to be more uniform and diffuse, so the Zr-4 alloy with high Si content shows better corrosion resistance.
- Zr-4 alloy,
- Fe+Cr content,
- Si content,
- Corrosion resistance

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References(24)

References

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