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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 984 - 993 (10page)
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A low-carbon steel sheet containing 0.05 C, 0.203 Mn, and 0.0229 Si (all in wt%) was rapidly annealed in a temperaturerange of 300 °C to 600 °C after severe plastic deformation by using constrained groove pressing (CGP)technique. Microstructure evolution was investigated by scanning electron and optical microscopes. Mechanicalproperties were evaluated by hardness measurements and shear punch test. The results showed a thermal stabilityup to 400 °C where recrystallization did not occur in the specimens even after 7200 s. This thermal stability is inagreement with previously reported results of conventional annealing of the same steel after CGP. However,annealing at 500 °C and 600 °C led to recrystallization which started after holding times of 600 s and 20 s, respectively. Longer holding times resulted to grain growth and deterioration of strength and hardness, but the finalstrength and hardness were still higher than those of conventionally annealed specimens. The reason has beenattributed to no abnormal grain growth in the present study, in contrast to that occurs after conventional annealingof CGPed low carbon steel. The kinetics of recrystallization at 600 °C was studied using the celebrated Johnson-Mehl-Avrami-Kolmogorov (JMAK) model; the results showed a bi-linear JMAK plot indicating two differentstages of recrystallization rate before and after 70% recrystallization.
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