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10.3390/ma19010143
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Article

Effects of Solid Solution Heat Treatment on the Corrosion Behavior of 800H Used in Fourth-Generation Nuclear Power Generators

by
Yu Liu
1,2,3,*,
Xiaoyuan Guo
1,
Min Wang
1,
Kaixing Yao
1,
Huiqing Dong
1,
Yafan Li
1,
Zhidong Wang
2,
Feng Wang
2 and
Rui Luo
1,*
1
School of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, China
2
Jiangsu Yinhuan Precision Steel Pipe Co., Ltd., Yixing 214200, China
3
Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing Institute of Technology, Nanjing 211167, China
*
Authors to whom correspondence should be addressed.
Materials 2026, 19(1), 143; https://doi.org/10.3390/ma19010143
Submission received: 2 December 2025 / Revised: 18 December 2025 / Accepted: 26 December 2025 / Published: 31 December 2025
(This article belongs to the Special Issue Corrosion and Mechanical Behavior of Metal Materials (3rd Edition))
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Abstract

Incoloy 800H is important structural alloy for heat exchange tubes of Generation IV nuclear power systems. Revealing the key heat treatment effects on the microstructure and corrosion behavior of 800H is a key issue for its performance optimization and safe application in IV nuclear power industries. This work investigated the solid solution heat treatment–microstructure–corrosion resistance relationship using various electrochemical corrosion techniques and morphology characterizations. The results showed that 1120 °C was an insufficient solid solution heat treatment temperature for 800H, at which 800H demonstrated uneven enlargement of grains and undissolved Cr-carbides, which resulted in fast corrosion. 800H demonstrated even growth of grains with best grain uniformity and dissolution of Cr-carbides at 1150 °C, thus showing the best corrosion resistance. However, the further increase in solid solution temperature to 1180 °C resulted in excessive grain growth and severe intergranular corrosion (IGC) attack. This work deepened the understanding of the corrosion mechanism of 800H and provided data for its performance optimization.
Keywords: 800H; corrosion resistant performance; heat treatment; microstructure 800H; corrosion resistant performance; heat treatment; microstructure
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MDPI and ACS Style

Liu, Y.; Guo, X.; Wang, M.; Yao, K.; Dong, H.; Li, Y.; Wang, Z.; Wang, F.; Luo, R. Effects of Solid Solution Heat Treatment on the Corrosion Behavior of 800H Used in Fourth-Generation Nuclear Power Generators. Materials 2026, 19, 143. https://doi.org/10.3390/ma19010143

AMA Style

Liu Y, Guo X, Wang M, Yao K, Dong H, Li Y, Wang Z, Wang F, Luo R. Effects of Solid Solution Heat Treatment on the Corrosion Behavior of 800H Used in Fourth-Generation Nuclear Power Generators. Materials. 2026; 19(1):143. https://doi.org/10.3390/ma19010143

Chicago/Turabian Style

Liu, Yu, Xiaoyuan Guo, Min Wang, Kaixing Yao, Huiqing Dong, Yafan Li, Zhidong Wang, Feng Wang, and Rui Luo. 2026. "Effects of Solid Solution Heat Treatment on the Corrosion Behavior of 800H Used in Fourth-Generation Nuclear Power Generators" Materials 19, no. 1: 143. https://doi.org/10.3390/ma19010143

APA Style

Liu, Y., Guo, X., Wang, M., Yao, K., Dong, H., Li, Y., Wang, Z., Wang, F., & Luo, R. (2026). Effects of Solid Solution Heat Treatment on the Corrosion Behavior of 800H Used in Fourth-Generation Nuclear Power Generators. Materials, 19(1), 143. https://doi.org/10.3390/ma19010143

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