Kinetics of isochronal austenization in modified high Cr ferritic heat-resistant steel |
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| Authors: | Chenxi Liu Yongchang Liu Dantian Zhang and Zesheng Yan |
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| Institution: | (1) School of Materials Science and Engineering, Tongji University, Shanghai, 200092, China;(2) Department of Materials Science, Fudan University, Shanghai, 200433, China |
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| Abstract: | Employment of high Cr ferritic steels as a main structural material is considered as a way to achieve economical competitiveness
of main steam pipe and nuclear reactors in power plants. Differential dilatometry and microstructure observation were employed
to investigate the isochronal austenitic transformation of the modified high Cr ferritic steel. The kinetics of the isochronal
austenitic transformation were described by a phase-transformation model involving site saturation (pre-existing nuclei),
diffusion-controlled growth, and incorporating an impingement correction. The experimental results and kinetic analysis indicate
that an increase of the heating rate promotes the diffusion-controlled austenitic transformation. The dissolving degree of
precipitates during the austenization process affects the activation energy for diffusion and the undissolved precipitates
lead to an increase of the onset temperature of the subsequent martensite transformation upon cooling. |
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