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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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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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