Effect of N and Al Addition on Microstructure and Mechanical Properties of Modified 25Ni-20Cr Austenitic Stainless Steel Aged at 700℃

Wang Qi; Chen Guoshuai; Zhou Zhangjian; Xiong Ru; Zheng Jiyun; Tang Rui; Zhang Lefu

doi:10.13832/j.jnpe.2023.05.0275

Volume 44 Issue 5

Oct. 2023

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Article Navigation > Nuclear Power Engineering > 2023 > 44(5): 275-283

Wang Qi, Chen Guoshuai, Zhou Zhangjian, Xiong Ru, Zheng Jiyun, Tang Rui, Zhang Lefu. Effect of N and Al Addition on Microstructure and Mechanical Properties of Modified 25Ni-20Cr Austenitic Stainless Steel Aged at 700℃[J]. Nuclear Power Engineering, 2023, 44(5): 275-283. doi: 10.13832/j.jnpe.2023.05.0275

Citation:

Wang Qi, Chen Guoshuai, Zhou Zhangjian, Xiong Ru, Zheng Jiyun, Tang Rui, Zhang Lefu. Effect of N and Al Addition on Microstructure and Mechanical Properties of Modified 25Ni-20Cr Austenitic Stainless Steel Aged at 700℃[J]. Nuclear Power Engineering, 2023, 44(5): 275-283. doi: 10.13832/j.jnpe.2023.05.0275

Citation:

Wang Qi, Chen Guoshuai, Zhou Zhangjian, Xiong Ru, Zheng Jiyun, Tang Rui, Zhang Lefu. Effect of N and Al Addition on Microstructure and Mechanical Properties of Modified 25Ni-20Cr Austenitic Stainless Steel Aged at 700℃[J]. Nuclear Power Engineering, 2023, 44(5): 275-283. doi: 10.13832/j.jnpe.2023.05.0275

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Effect of N and Al Addition on Microstructure and Mechanical Properties of Modified 25Ni-20Cr Austenitic Stainless Steel Aged at 700℃

doi: 10.13832/j.jnpe.2023.05.0275

1.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
3.
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

Received Date: 2022-11-21
Rev Recd Date: 2023-01-17
Publish Date: 2023-10-13

Abstract

Abstract

The high temperature strength of the 25Ni-20Cr (S35140) austenitic stainless steel needs to be improved to meet the application requirements of supercritical water reactor (SCWR) for cladding materials. In this study, the properties of S35140 Steel were improved by microalloying, adding N and Al and aging at 700℃. The results showed that nano-NbN phase precipitated in N-added steel, and dislocation was pinched. With aging, the tensile strength at room temperature increased slightly, the elongation at room temperature almost remained unchanged, and the tensile strength at high temperature decreased slightly; however, the elongation at high temperature increased to 65%, and the impact energy still reached 111.39 J after aging for 120 h. A large number of NiAl and Laves phases precipitated in Al-added steel. With aging, the tensile strength at room temperature and high temperature increased significantly, and the tensile strength at room temperature even reached 1000 MPa, while the ductility and impact toughness decreased significantly. Therefore, in S35140 steel, adding N increased the ductility and toughness, while adding Al increased the strength, both of which significantly improved the mechanical properties of S35140 steel.
- S35140 austenitic steel,
- Microstructure,
- Mechanical properties,
- Thermal aging

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References(29)

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