Effects of thermal aging temperature and Cr content on phase separation kinetics in Fe-Cr alloys simulated by the phase field method

Shu-xiao Li; Hai-long Zhang; Shi-lei Li; Yan-li Wang; Fei Xue; Xi-tao Wang

doi:10.1007/s12613-013-0835-z

Volume 20 Issue 11

Nov. 2013

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Abstract

International Journal of Minerals, Metallurgy and Materials > 2013 > 20(11): 1067-1075. > DOI: 10.1007/s12613-013-0835-z

Shu-xiao Li, Hai-long Zhang, Shi-lei Li, Yan-li Wang, Fei Xue, and Xi-tao Wang, Effects of thermal aging temperature and Cr content on phase separation kinetics in Fe-Cr alloys simulated by the phase field method, Int. J. Miner. Metall. Mater., 20(2013), No. 11, pp.1067-1075. https://dx.doi.org/10.1007/s12613-013-0835-z

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Effects of thermal aging temperature and Cr content on phase separation kinetics in Fe-Cr alloys simulated by the phase field method

Shu-xiao Li¹⁾,
Hai-long Zhang¹⁾,
Shi-lei Li¹⁾,
Yan-li Wang¹⁾,
Fei Xue²⁾ and
Xi-tao Wang^1), ,

Author Affilications

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
Suzhou Nuclear Power Research Institute, Suzhou, 215004, China

Funds:

the Na-tional Science and Technology Major Project of China (No.2011ZX06004)

the National High-Tech Research and Development Program of China (Nos.2012AA03A507 and 2012AA050901)

Received: 04 March 2013; Revised: 05 May 2013; Accepted: 15 May 2013; Available Online: 10 June 2021

Graphical Abstract

Abstract

Abstract

Phase field simulations of phase separation in Fe-Cr binary alloys were performed by using the Cahn-Hilliard diffusion function. A new mobility model in relation to aging temperature and Cr content was used in the simulations. Two alloys of Fe-30at%Cr and Fe-35at%Cr were investigated at two different aging temperatures of 573 and 673 K. The phase separation kinetics was found to consist of three stages: wavelength modulation, amplitude increase, and coarsening of Cr-enriched regions. A higher thermal aging temperature accelerated the phase separation and increased the wavelength of concentration fluctuation. While the effect of Cr content on the phase separation kinetics was slight, Fe-Cr alloys with a higher Cr content were found to generate a larger number and a finer size of Cr-enriched regions. The simulation results provide consultation for design and safe operation of duplex stainless steel pipes in nuclear power plants.
- stainless steel,
- duplex steel,
- phase separation,
- kinetics,
- nuclear power plants

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