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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.1
- 수록면
- 939 - 951 (13page)
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The hot deformation behavior of an ultra-pure 17%Cr ferritic stainless steel was studied in the temperaturerange of 750-1000 °C and strain rates of 0.5 to 10 s1 using isothermal hot compression tests in a thermomechanicalsimulator. The microstructural evolution was investigated using electron backscattered diffractionand transmission electron microscopy. A modified constitutive equation considering the effect of strain onmaterial constant was developed, which predicted the flow stress for the deformation conditions studied, exceptat 950 °C in 1 s1 and 900 °C in 10 s1. Decreasing deformation temperature and increasing strain was beneficialin refining the microstructure. Decreasing deformation temperature, the in-grain shear bands appeared inthe microstructure. It is suggested that the dynamic softening mechanism is closely related to deformationtemperature. At low deformation temperature, dynamic recovery was major softening mechanism and no dynamicrecrystallization occurred. At high deformation temperature, dynamic softening was explained in terms ofefficient dynamic recovery and limited continuous dynamic recrystallization. A drop in the flow stress wasnot found due to very small fraction of new grains nucleated during dynamic recrystallization.
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