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The truck beam steel (BM510L) contains microallying elements Nb, Ti and V. The static continuous cooling transformation and dynamic continuous cooling transformation have been studied by means of a Gleeble1500 thermal mechanical simulator. Thermal expansion method with metallographic examination was adopted to obtain the static CCT and the dynamic CCT diagrams. The two diagrams have been contrasted and discussed. After austenitizing at 900℃, the steel is cooled down to room temperature by cool rate of 15℃/s, and then the microstructure of the steel is pearlite and ferrite. As the cooling rate up to 1℃/s, bainite is observed in the microstructure. With cooling rate increasing, the bainite becomes fine. As the steel is deformed after austenitizing at 900℃/s, the during of phase transformation becomes short. But bainite transformation appearance is retarded because of deformation. When cooling rate increases up to 2℃/s, then bainite is observed in the microstructure. At the same time, the deformation can fine grain and improve micrograph. KEY WORDS microalloying, continuous cooling transformation, thermal expansion method, CCT
ABSTRACT The truck beam steel contains microallying elements Nb, Ti and V. The research has been studied on the experimental rolling mill by changing rolling temperature, coiling temperature and cooling rate. The mechanical properties were tested and the microstructures were observed. The experimental results indicated that the temperature parameters have important effect on the mechanical properties and microstructure of the BM510L. After 1150℃ soaking for 2 hours,the elongation and the tensile strength has increased while the rolling temperature decrease. The steel, which deformed at 950~830℃, cooled by about 15℃/s and coiled at 580~670℃, has good mechanical properties and microstructure. KEY WORDS niobium,titanium,vanadium,microalloying,mechanical properties
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