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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 823 - 837 (15page)
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In this paper, the constitutive model and dynamic recrystallization characteristics of 12Cr ultra-super-critical rotor steelwere investigated quantitatively during hot deformation. A series of axisymmetric hot compression tests at temperaturesfrom 900 to 1200 °C under strain rates of 0.001–1 s−1 were conducted on a Gleeble−1500D thermal simulator. Based on theexperimental true stress–strain curves varying with temperature and strain rates, a complete constitutive model was establishedand all material parameters in the model could be expressed as a function of strain using a fifth order polynomial fit. The proposed model was verified so as to have the capability of accurately predicting the flow behaviour with an averageabsolute relative error of < 2.82%. Meanwhile, after hot deformation the microstructure was observed via electron backscatterdiffraction technology. Then, the dependence of the characteristic parameters on the Zener–Hollomon parameter wereconfirmed. Furthermore, the kinetics equation of dynamic recrystallization was obtained, which included the flow stresscalculated based on the evolution equation of the dislocation density during the work hardening-dynamic recovery stage. The result indicated that the predicted values for dynamic recrystallization volume fraction and flow stress were in line withthe experimental values.
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