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

Tong-hua Liu; Wei Wang; Wen-jiang Qiang; Guo-gang Shu

doi:10.1007/s12613-018-1666-8

Volume 25 Issue 10

Oct. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(10): 1148-1155

Tong-hua Liu, Wei Wang, Wen-jiang Qiang, and Guo-gang Shu, Mechanical properties and kinetics of thermally aged Z3CN20.09M cast duplex stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1148-1155. https://doi.org/10.1007/s12613-018-1666-8

Cite this article as:

Tong-hua Liu, Wei Wang, Wen-jiang Qiang, and Guo-gang Shu, Mechanical properties and kinetics of thermally aged Z3CN20.09M cast duplex stainless steel, Int. J. Miner. Metall. Mater., 25(2018), No. 10, pp. 1148-1155. https://doi.org/10.1007/s12613-018-1666-8

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Research Article

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

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Corresponding author:
Wen-jiang Qiang E-mail: qiang_wj@163.com
Received: 23 January 2018; Revised: 21 May 2018; Accepted: 23 May 2018

Abstract

Abstract

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℃. 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℃ 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℃ 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.
- stainless steel;
- thermal aging;
- embrittlement;
- activation energy;
- microhardness;
- Charpy impact energy

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