Electrically assisted deep drawing on high-strength steel sheet
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ORIGINAL ARTICLE
Electrically assisted deep drawing on high-strength steel sheet Z. Lv 1,2 & Y. Zhou 1 & L. Zhan 1 & Z. Zang 1 & B. Zhou 1 & S. Qin 1 Received: 8 June 2020 / Accepted: 29 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract 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. Keywords Mold design . High-strength steel . Deep drawing . Electroplasticity . Hardness
1 Introduction With the development of the automobile industry, the problems of environmental pollution and energy shortages have become increasingly serious. In order to reduce fuel consumption and reduce exhaust emissions, light-weighting of automobiles has become a trend in automobile development. High-strength steels are widely used in the automotive industry due to higher specific strength and specific stiffness. Not only can they meet the requirements of vehicle light-weighting but they can also ensure the safety performance of the car [1–3]. However, due to the characteristics of high-strength steel’s structure and its poor formability at room temperature, the use of ordinary processing techniques cannot obtain excellent high-quality performance products; this
* Z. Lv [email protected] 1
Key Laboratory of Advanced Forging & Stamping Technology and Science, Ministry of Education of China, Yanshan University, Qinhuangdao 066004, China
2
State Key Laboratory of Metastable Material Science and Technology, Yanshan University, Qinhuangdao 066004, China
has hindered its popularization and application [4–6]. Zuev et al. [7] found that accelerated electron irradiation could greatly improve the plasticity of single-crystal Zn during unidirectional stretching. It can be said that this discovery laid the foundation for the study of electroplastic effects. Yang et al. [8] studied current density effects on the mechanical properties of hard aluminum 2A12 and supe
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