Abstract：Microstructure of dual phase steel produced in different cooling rate were observed by OM and SEM, and its mechanical properties were test. Results show that the cooling rate is high, the microstructure of dual phase steel are ferrite and martensite, lower yield strength and higher tensile strength, yield ratio is 0.53; cooling rate is low, the microstructure of dual phase steel is small amount of granular bainite besides the ferrite and martensite, and higher yield strength, lower tensile strength, yield ratio is 0.64.
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2022, Vol. 29 