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• W4386001429 abstract "ABSTRACTHot deformation of 12%Cr USC rotor steel was investigated by hot compression testing over a temperature range of 900 °C to 1,200 °C at strain rates of 0.001 s−1–1 s−1 with the use of a Gleeble–1500D thermal-mechanical simulator. The true stress–strain curves were obtained and showed that the stress increased with a decrease in temperature, an increase in strain rate, or both. Based on the stress–strain curves, processing maps of 12%Cr USC rotor steel under various strains were established, and the Zener-Hollomon (Z) parameter was calculated, it increased with decreasing temperature or increasing strain rate. Combining the values of the Z parameter and the microstructure after thermal compression, it was found that dynamic recovery was the main softening mechanism at lnZ > 39.09, and dynamic recrystallisation (DRX) became the main softening mechanism at 39.09 > lnZ > 32.56. When lnZ < 32.56, DRX occurred completely, and a small amount of recrystallised grains formed. The deformed microstructures showed that 12%Cr USC rotor steel incurred a continuous dynamic recrystallisation mechanism, a discontinuous dynamic recrystallisation mechanism, and a geometric dynamic recrystallisation mechanism during the hot deformation process. The intrinsic workability of 12%Cr USC rotor steel was explored by analysing the processing maps. It was found that the best forging process parameters range of the material in the actual production process was a deformation temperature range of 1,100 °C to 1,200 °C and a strain-rate range of 0.01 s−1–0.1 s−1.KEYWORDS: 12%Cr USC rotor steeldynamic recrystallisation mechanismdynamic softening mechanismhot deformation behaviourintrinsic workability Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis work is financially supported by the National Natural Science Foundation of China (51775361), The Scientific Research Starting Foundation of Taiyuan University of Science and Technology (20222055), and Award Fund for Outstanding Doctors in Shanxi Province (20232031)." @default.
• W4386001429 created "2023-08-20" @default.
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• W4386001429 date "2023-08-19" @default.
• W4386001429 modified "2023-10-07" @default.
• W4386001429 title "Dynamic recrystallisation behaviour and intrinsic workability of 12%Cr USC rotor steel during hot deformation" @default.
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• W4386001429 doi "https://doi.org/10.1080/14786435.2023.2224090" @default.
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