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The isochronal δ → γ transformation of high Cr ferritic heat-resistant steel during cooling

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Abstract

Thermal simulation technology was employed to investigate phase transformation in heat-affected zones (HAZ) of high Cr ferritic heat-resistant steel. The simulated continuous cooling transformation diagram was established based on the experimental results obtained from different cooling rates in the range of 0.02–60 °C/s. A theoretical model considering the site saturation nucleation at grain boundaries has been applied to calculate the austenite fraction as a function of cooling rate. It is found that both the austenite fraction and grain size decrease with the increase of cooling rates. The calculated results are mostly consistent with the experimental data.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China and Shanghai Baosteel Group Company (No. 50834011) for grant and financial support.

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Authors and Affiliations

  1. School of Material Science and Engineering, Tian** Key Laboratory of Advanced Jointing Technology, Tian** University, Tian**, 300072, People’s Republic of China

    Qiuzhi Gao, Yongchang Liu, **njie Di, Zhizhong Dong & Zesheng Yan

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  1. Qiuzhi Gao
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  2. Yongchang Liu
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  3. **njie Di
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  4. Zhizhong Dong
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  5. Zesheng Yan
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Correspondence to **njie Di.

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Gao, Q., Liu, Y., Di, X. et al. The isochronal δ → γ transformation of high Cr ferritic heat-resistant steel during cooling. J Mater Sci 46, 6910–6915 (2011). https://doi.org/10.1007/s10853-011-5656-8

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  • DOI: https://doi.org/10.1007/s10853-011-5656-8

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