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Vol.43, No.10, 619 ~ 626, 2005
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| Title |
| Effect of Severe Plastic Deformation by ECAP on Reverse Transformation of a Low Carbon Ferrite-Pearlite Steel |
| 김재욱 Jae Wook Kim , 최혜영 Hyee Young Choi , 손영일 Young Il Son , 박경태 Kyung Tae Park , 신동혁 Dong Hyuk Shin , 이영국 Young Kook Lee |
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| Abstract |
| The effect of heavy deformation by ECAP on reverse transformation from ferrite and pearlite to austenite during heating has been investigated in a plain carbon-manganese steel using a dilatometer and optical and electron microscopy. Pearlite first transformed to austenite up to about 790℃ and then ferrite changed to austenite in both ECAPed and unECAPed specimens. Austenite preferentially formed at the interface between pearlite and proeutectoid ferrite and at the pearlite nodule boundaries. The recrystallization of proeutectoid ferrite and pearlitic ferrite occurred in advance before the reverse transformation in the case of ECAPed specimen. Consequently, the reverse transformation kinetics of ferrite to austenite is not greatly different in ECAPed and unECAPed specimens. However, the reverse transformation of pearlite to austenite in the ECAPed sample was faster than that in unECAPed one because of enhanced decomposition of pearlitic cementite by ECAP. |
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| Key Words |
| ECAP, Low carbon-manganese steel, Reverse transformation, Recrystallization, Austenite |
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