Mechanical properties and kinetics of thermally aged Z3CN20.09M cast duplex stainless steel

Cast stainless steels used in nuclear power plants suffer from fracture toughness losses owing to thermal aging after long-term service at temperatures ranging from 280–320°C. To study the thermal aging embrittlement of Z3CN20.09M duplex stainless steel produced in China, accelerated thermal aging e...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2018-10, Vol.25 (10), p.1148-1155
Main Authors: Liu, Tong-hua, Wang, Wei, Qiang, Wen-jiang, Shu, Guo-gang
Format: Article
Language:English
Subjects:
Activation energy
Aging
Aging (metallurgy)
Ceramics
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Composites
Corrosion and Coatings
Duplex stainless steels
Ferrite
Fracture toughness
Glass
Impact analysis
Impact tests
Kinetics
Materials Science
Mathematical analysis
Mechanical properties
Metallic Materials
Microhardness
Natural Materials
Nuclear energy
Nuclear power plants
Parameters
Stainless steel
Surfaces and Interfaces
Thin Films
Tribology
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Summary:Cast stainless steels used in nuclear power plants suffer from fracture toughness losses owing to thermal aging after long-term service at temperatures ranging from 280–320°C. To study the thermal aging embrittlement of Z3CN20.09M duplex stainless steel produced in China, accelerated thermal aging experiments were carried out at 350, 380, and 400°C for up to 10000 h. Microhardness and Charpy impact energies were measured at different aging times. The microhardness of ferrite increased drastically over the initial aging time of 2000 h at 380 and 400°C and then slowly reached HV 0.01 560. In contrast to this observed change in microhardness, Charpy impact energies sharply decreased after initial aging and then gradually reached a minimum value. Taking the microhardness of the ferrite phase as the parameter describing the thermal kinetics of the stainless steel samples, the activation energy of thermal aging was calculated to be 51 kJ/mol. Correlations between the thermal aging parameter, P , and ferrite microhardness and between P and Charpy impact energy were also analyzed. The results showed that the activation energy calculated from the ferrite microhardness is much more reasonable than that obtained using other parameters, such as chemical composition and impact energy.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-018-1666-8