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Constitutive analysis and optimization on hot working parameters of as-cast high Cr ultra-super-critical rotor steel with columnar grains

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Abstract

Isothermal hot compression tests on the as-cast high-Cr ultra-super-critical rotor steel with columnar grains were carried out in the temperature range from 1223 to 1523 K and at strain rates from 0.001 to 1 s−1. The compression direction was parallel to the longitudinal direction of columnar grains. The constitutive equation based on Arrhenius model was presented, and the processing maps based on the dynamic material model were developed, correlating with microstructure observation. The main softening mechanism was dynamic recovery at 1223 K under strain rates from 0.1 to 1 s−1, whereas it was dynamic recrystallization under other deformation conditions. The constitutive equation modified by strain compensation reasonably predicted the flow stresses. The processing maps and microstructure evolution mechanism schematic indicated that the optimum hot working parameters lay in the zone defined by the temperature range from 1423 to 1473 K and the strain rate range from 0.001 to 1 s−1.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

    Zong-ye Ding, Di Zhang, Qiao-dan Hu Ph.D. (Prof.), Long Zeng & Jian-guo Li

  2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, 200240, Shanghai, China

    Qiao-dan Hu Ph.D. (Prof.) & Jian-guo Li

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  1. Zong-ye Ding
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  2. Di Zhang
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  3. Qiao-dan Hu Ph.D.
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  4. Long Zeng
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  5. Jian-guo Li
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Correspondence to Qiao-dan Hu Ph.D..

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Ding, Zy., Zhang, D., Hu, Qd. et al. Constitutive analysis and optimization on hot working parameters of as-cast high Cr ultra-super-critical rotor steel with columnar grains. J. Iron Steel Res. Int. 24, 916–924 (2017). https://doi.org/10.1016/S1006-706X(17)30134-6

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30134-6

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