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Effects of V Addition on Tensile and Impact Properties in Low Carbon 1.1Mn Steels  

Yang, H.R. (Department of Mechanical Engineering, Incheon City College)
Cho, K.S. (School of Advanced Materials Engineering, Kookmin University)
Choi, J.H. (School of Advanced Materials Engineering, Kookmin University)
Sim, H.S. (Technical Research Lab., Dongkuk Steel Mill Co.)
Lee, K.B. (School of Advanced Materials Engineering, Kookmin University)
Kwon, H. (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.21, no.6, 2008 , pp. 281-286 More about this Journal
Abstract
In the 1.1 Mn steel containing boron, effects of the 0.1 V addition and processing condition were studied. In the $550^{\circ}C$ interrupted cooling where the main structure is (ferrite + pearlite), the impact toughness decreased as the tensile strength increased by the 0.1 V addition. The $800^{\circ}C$ rolling including two step rolling of $800-770^{\circ}C$, exhibited better strength-toughness balance, as compared to the $770^{\circ}C$ rolling. This seems to be kind of conditioning effect at higher temperature, e.g., more uniform deformation effect. In the accelerated cooling after the $750^{\circ}C$ rolling in a dual phase range, the impact toughness was enhanced, despite a large increase in tensile strength. This is believed to be related to the change of main structure from (ferrite + pearlite) to (ferrite + bainite).
Keywords
Low carbon steel; V addition; Strength-toughness balance; Rolling and cooling;
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