Abstract
The effects of predeformation on the microstructure and mechanical properties of 1020 dual phase steel were investigated. It was found that predeformation showed a significant refinement effect on the microstructures of both ferrite and martensite. The amount of twin martensite was found to increase with increasing predeformation. Ferrite twins were found to form close to martensite/ferrite boundaries. The reasons for the formation oftheferrite twin and the increase of the martensite twin due to predeformation were analysed. Results of tensile tests have shown that both yield strength and tensile strength increase with increasing predeformation, and predeformation was also shown to have a complex influence on the uniform elongation and total elongation of this dual phase steel.
MST/1181
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