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곽재현(Jai-hyun Kwak),진영훈(Young-hoon Jin),김지원(Jiweon Kim),이규영(Kyooyung Lee),신동석(Dongseoug Sin) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The effect of chemical compositions, microstructure of hot bands and transformation behavior during continuous annealing in TRIP-assisted steels, in conjunction with Al, were investigated by taking into account of transformation behavior and mechanical properties of steels. Transformation behavior of austenite was estimated by dilatation from intercritical annealing to isothermal bainitic transformation. The higher tensile strength of annealed sheets could be obtained by finer microstructure of hot band. Cr, Al and B were useful elements to increase the tensile strength and elongation in 1.2㎬ grade TRIP steel. Since B inhibits the transformation of ferrite from austenite, steel containing Al and B had the maximum volume fraction of untransformed austenite. Al and B addition increased the amount of retained austenite and thinned the shape of austenite lath. The trial of galvanealed and cold rolled steel sheet were done at Kwangyang works POSCO. The tensile strength above 1200㎫ with elongation above 18% could be obtained by 0.27% carbon steel.