Acknowledgement
Supported by : 금오공과대학교
열처리공학회지 (Journal of the Korean Society for Heat Treatment)
- 제13권5호
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- Pages.346-354
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- 2000
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- 1225-1070(pISSN)
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- 2508-4046(eISSN)
재결정제어압연용 저탄소강의 연속냉각 상변태거동에 미치는 Nb 첨가효과
Effect of Nb Addition on Phase Transformation Behavior during Continuous Cooling in Low Carbon Steels for Recrystallization Control Rolling
- Lee, Sang Woo (Division of Advanced Materials and Systems Engineering, Kumoh National University of Technology) ;
- Choo, Wung Yong (Plate, Rod & Welding Research Group, Technical Research Laboratories, POSCO)
- Received : 2000.07.24
- Published : 2000.09.30
Abstract
Effect of Nb addition on the phase transformation behavior was studied through continuous cooling transformation tests after reheating(reheating CCT) and deforming(deforming CCT) the 0.07%C-1.3%Mn-0.015%Ti-(0~0.08)% Nb steels. Transformation temperatures for deforming CCT were lower than those for reheating CCT, and the critical cooling rate for bainite transformation during deforming CCT was lower than that during reheating CCT. These enhanced hardenability for deforming CCT was considered to come from the sufficient solid solution of Nb in austenite during high temperature reheating before deformation. With Nb addition, the phase transformation temperature decreased, the bainite formation was enhanced, and the hardness of steel increased. Furthermore, these phenomena were more remarkable for deforming CCT than for reheating CCT. From the results, Nb-Ti bearing low carbon steel was considered to be a very favorable alloy system with good strength/toughness balance by recrystallization control rolling process.
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