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Reverse transformation of ferrite and pearlite to austenite in an ultrafine-grained low-carbon steel fabricated by severe plastic deformation
Authors:Young IL Son  Young-Kook Lee  Kyung-Tae Park
Affiliation:(1) Technology Research Center of Agency for Defense Development, 305-600 Taejon, Korea;(2) Department of Metallurgical Engineering, Yonsei University, 120-749 Seoul, Korea;(3) Division of Advanced Materials Science and Engineering, Hanbat National University, 305-719 Taejon, Korea
Abstract:Reverse transformation characteristics of a low-carbon steel consisting of ultrafine-grained (UFG) ferrite and severely deformed pearlite by severe plastic deformation were investigated and compared to those of the steel having coarse-grained (CG) ferrite and undeformed pearlite by austenitization and subsequent air cooling. Coarse-grained steel exhibited two serial transformation stages, i.e., pear-lite → austenite followed by ferrite → austenite. Contrarily, UFG steel transformed with the three serial stages, i.e., probably carbon-supersaturated ferrite → austenite, not-fully-dissolved pearlite → austenite, and ferrite → austenite transformations.
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