Abstract
AbstractThe effects of pulse current on the microstructure and mechanical properties of two kinds of ultrahigh-strength steels (UHSS) were studied by electrically assisted tension tests. The elongation of the two UHSS (MS1300 and QP980) moderately increases at relatively low current density, while their microstructures keep almost unchanged. For MS1300 steel, the elongation can be increased from 8.3% at room temperature to 12.4% at the current density of 6.58 A/mm2. The peak stress of QP980 is reduced to 900 MPa at the current density of 7.46 A/mm2, and the elongation is increased from 22.3% at room temperature to 38.4%. If the current density is further increased, the tensile strengths of UHSS are greatly reduced. Meanwhile, their microstructures are also obviously varied. Therefore, the appropriate current density should be selected in order to maintain the UHSS grades.KeywordsPulse currentUltrahigh-strength steelMechanical propertiesMicrostructure
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