Electrically assisted deep drawing on high-strength steel sheet.

Based on the design and preparation of the electrically assisted drawing die, the electric-assisted deep-drawn tests were carried out on high-strength steel plates with different strengths to study the electroplastic effect on high-strength steel drawing. The temperature distribution, macro-morphology, and hardness variation of deep-drawing workpieces undergone different electrical parameters were analyzed. The results showed that the Joule heat generated by the electrically assisted drawing die on the sample was symmetrically distributed along the center of the circular sheet, and the electrical pulse heat effect had little effect on the temperature rise of sheets (same material) with different strength levels. The introduction of pulse current could improve the forming performance of high-strength steel to a certain extent, as well as enhance its deep-drawing deformation ability. The hardness of the work-piece increased after it was deep-drawn. The Joule heat generated by the pulse current did not cause changes in the microstructure of the high-strength steel. The electroplastic effect improved the mechanical properties of the work-piece while increasing the formability of the high-strength steel plates. [ABSTRACT FROM AUTHOR]