Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor

Li Jun; Li Shaohong; Xiong Ru; Yang Hongmei; Li Mengnie

doi:10.13832/j.jnpe.2023.06.0148

Volume 44 Issue 6

Dec. 2023

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Li Jun, Li Shaohong, Xiong Ru, Yang Hongmei, Li Mengnie. Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 148-154. doi: 10.13832/j.jnpe.2023.06.0148

Citation:

Li Jun, Li Shaohong, Xiong Ru, Yang Hongmei, Li Mengnie. Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 148-154. doi: 10.13832/j.jnpe.2023.06.0148

Citation:

Li Jun, Li Shaohong, Xiong Ru, Yang Hongmei, Li Mengnie. Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor[J]. Nuclear Power Engineering, 2023, 44(6): 148-154. doi: 10.13832/j.jnpe.2023.06.0148

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Study on the Thermal Aged Microstructure of Candidate Austenitic Heat-resistant Stainless Steel for Supercritical Water-cooled Reactor

doi: 10.13832/j.jnpe.2023.06.0148

1.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
2.
Key Laboratory of Nuclear Reactor System Design Technology, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2022-11-20
Rev Recd Date: 2023-04-27
Publish Date: 2023-12-15

Abstract

Abstract

In order to study the change of thermal aged microstructure and impact properties of alumina-forming austenitic stainless (AFA) steel, a candidate cladding material for Supercritical water-cooled reactor（SCWR）, the AFA steel with 2.5% aluminum content was subjected to thermal aging treatment at 650℃ for 500~3000 h. The precipitated phases and the impact fracture were observed by field emission scanning electron microscopy. The types and crystal structures of the precipitated phases were studied by transmission electron microscopy. The results show that the impact toughness of the test steel decreases gradually with the extension of aging time, and the fracture of the test steel gradually transits from dimple fracture to mixed fracture mode of dimple fracture and cleavage fracture. The precipitation of Laves phase at grain boundaries and the precipitation and coarsening of γ'-Ni₃Al phase during thermal aging are the main reasons for the decrease of impact toughness of AFA steel with the extension of aging time.
- SCWR,
- Fuel cladding,
- AFA steel,
- Impact properties

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References(24)

References

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