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Effect of Pulse Current on the Tensile Deformation of SUS304 Stainless Steel

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Abstract

The effect of pulse current on the mechanical properties of SUS304 metastable austenitic stainless steel was studied by tension test with and without air-cooling under different current densities. The microstructural variations at different conditions were also studied by SEM, TEM, and Feritscope. A negative effect on the plasticity was observed when current pulse was applied without air-cooling. But when Joule heating resulting from current pulse was excluded by air-cooling, the elongation of SUS304 stainless steel was increased to 72.4% at a current density of 2.95 A/mm2, which is 23.3% higher than that tested without pulse current at room temperature. Pulse current can decrease the dislocation density and dislocation pile-ups. Furthermore, EP effect from pulse current can accelerate martensitic transformation and enhance TRIP effect. The mechanism of current-induced martensitic transformation was discussed from Gibbs free energy change.

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Acknowledgments

The work was supported by the National Natural Science Foundation of China (No. 51105248). We express our sincere thanks for the financial support.

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Authors and Affiliations

  1. Department of Plasticity Technology, Shanghai Jiao Tong University, Shanghai, 200030, China

    Xifeng Li, Shen Wang, Shuangjun Zhao, Wei Ding & Jun Chen

  2. Dongguan Hengli Die and Mold Technological Industry Development Company Ltd., Dongguan, 523460, China

    Guohong Wu

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  1. Xifeng Li
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  2. Shen Wang
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Correspondence to Jun Chen.

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Li, X., Wang, S., Zhao, S. et al. Effect of Pulse Current on the Tensile Deformation of SUS304 Stainless Steel. J. of Materi Eng and Perform 24, 5065–5070 (2015). https://doi.org/10.1007/s11665-015-1804-7

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  • DOI: https://doi.org/10.1007/s11665-015-1804-7

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