Effect of Microstructure on Corrosion Behavior of Alloy 800H in Supercritical Water

Huang Tao; Su Haozhan; Zhang Lefu; Chen kai

doi:10.13832/j.jnpe.2023.05.0251

Volume 44 Issue 5

Oct. 2023

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Huang Tao, Su Haozhan, Zhang Lefu, Chen kai. Effect of Microstructure on Corrosion Behavior of Alloy 800H in Supercritical Water[J]. Nuclear Power Engineering, 2023, 44(5): 251-258. doi: 10.13832/j.jnpe.2023.05.0251

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Huang Tao, Su Haozhan, Zhang Lefu, Chen kai. Effect of Microstructure on Corrosion Behavior of Alloy 800H in Supercritical Water[J]. Nuclear Power Engineering, 2023, 44(5): 251-258. doi: 10.13832/j.jnpe.2023.05.0251

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Effect of Microstructure on Corrosion Behavior of Alloy 800H in Supercritical Water

doi: 10.13832/j.jnpe.2023.05.0251

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

Received Date: 2022-11-22
Rev Recd Date: 2022-12-22
Publish Date: 2023-10-13

Abstract

Abstract

Alloy 800H is listed as one of the main candidate nuclear fuel cladding materials in the design of supercritical water-cooled reactor (SCWR), but its corrosion performance under application conditions is significantly affected by processing conditions. In this paper, the corrosion behavior of Alloy 800H in different states in supercritical water is studied by autoclave immersion test, microscopic characterization and mechanism analysis, and the effects of surface grinding and polishing state, cold deformation and grain size on its general corrosion behavior are obtained. The results show that surface rough grinding, cold deformation and grain refinement can significantly reduce the corrosion rate and cause the law of corrosion weight gain to change from parabolic to linear. Grain refinement improves the grain boundary density of the material, and the high diffusion rate of Cr near the grain boundary is conducive to the formation of the Cr₂O₃ protective layer, thus improving the corrosion resistance of the material. The shallow surface deformation layer left after surface rough grinding can be recrystallized into high-density nanocrystals at high temperature, which is conducive to the rapid formation of the surface Cr₂O₃ protective layer and has a significant inhibitory effect on the initial corrosion behavior. The cold deformation caused by rolling improves the grain boundary and dislocation density of material, which obviously enhances the long-term corrosion resistance of the cladding tube.
- SCWR,
- Alloy 800H,
- General corrosion,
- Cold deformation,
- Grain size,
- Surface state

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References(27)

References

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