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Abstract In order to research the microstructure characteristic and mechanical properties of high strength dual phase steel DP600，the strength and plasticity was measured by tensile testing machine. The microstructure and inclusion and dislocation were analyzed by scanning electron microscope and transmission electron microscope. The results showed that the ferrite and martensitic were both obtained in dual phase steel DP600. With the increase of static stretching strain，the dislocation density increased and the dislocation tangle was more serious and crack initiated at the interface of inclusions or at the grain boundary of ferrite and the crack was found in martensite island. The yield strength was 394.9 MPa，tensile strength was 641.6 MPa. Plastic strain hardening index[n]was 0.154 and yield ratio was 0.616. The mechanical properties of hot rolled DP600 steel were higher than the cold rolled and annealing dual phase steel of the same class.
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Received: 06 March 2018
Published: 11 October 2018
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2018, Vol. 53 
