발간논문

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Vol.35, No.10, 1294 ~ 1302, 1997
Title
Relations between Microstructure and Mechanical Properties of High-Strength Dual-Phase Cold-Rolled Steels
정우창 Woo Chang Jeong
Abstract
An Investigation was made to determine the effects of annealing parameters on the mechanical properties of dual-phase steels with two different compositions: Fe-0.13% C-1.31% Si-1.91% Mn steel and Fe-0.13% C-1.11% Si-1.91% Mn-0.05% Nb steel. It was found that Nb retarded recrystallization of ferrite and refined the duplex microstructure of ferrite and martensite. Dual-phase properties were obtained in the former steel cooled at a rate of about 40℃/sec after intercritical annealing in the temperature range of 750℃ to 850℃ for 30 seconds. Nb-added steel showed higher strength and lower elongation than the steel without Nb. Good combinations of strength and elongation were obtained in specimens cooled at rates ranging from 10 to 20℃/sec in both steels. Overaging treatment at 400℃ resulted in the decrease in strength and increase in total elongation.
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