Anisotropic Electroplastic Effects on the Mechanical Properties of a Nano-Lamellar Austenitic Stainless Steel
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Anisotropic Electroplastic Effects on the Mechanical Properties of a Nano‑Lamellar Austenitic Stainless Steel Y. R. Ma1,2 · H. J. Yang1,2 · D. D. Ben1,2 · X. H. Shao2,3 · Y. Z. Tian4 · Q. Wang1 · Z. F. Zhang1,2 Received: 30 April 2020 / Revised: 14 June 2020 / Accepted: 24 June 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Effects of electropulsing treatment (EPT) on the microstructural evolution and mechanical properties of a cold-rolled 316L austenitic stainless steel with nano-lamellar structure were investigated. The EPT experiments were carried out with the electric current direction along the rolling direction (RD) and the transverse direction (TD) of the samples, respectively. Significant anisotropic electroplastic effects for the RD and TD specimens, i.e., reduced hardness/strength and enhanced ductility, were obtained owing to the different recrystallization behaviors of the RD and TD specimens during EPT. The RD specimens after EPT with larger recrystallized grain size and higher volume fraction of recrystallization show lower strength and higher elongation than that of the TD specimens. The main reason might be attributed to the change of the current direction in the two kinds of samples, which results in the different sensitivity of the microstructures to thermal and athermal effects during EPT. Keywords Stainless steel · Electroplastic effect · Electropulsing · Recrystallization · Anisotropy · Strength · Plasticity
1 Introduction Electropulsing treatment (EPT), as an instantaneous highenergy input method, was first discovered to be able to affect the performance of alloys in the 1960s [1, 2]. EPT has been documented to induce the microstructural evolution and result in the corresponding outstanding performances Available online at http://link.springer.com/journal/40195. * H. J. Yang [email protected] * Z. F. Zhang [email protected] 1
Shi‑changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2
School of Materials Science and Engineering, University of Sciences and Technology of China, Hefei 230026, China
3
Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4
Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110016, China
of various metallic materials, such as recrystallization [3, 4], grain refining [5–7], hardening and strengthening [8, 9], enhancing fatigue performance [10, 11], corrosion resistance [12], crack healing [13–15] and so on. Meanwhile, EPT has been widely applied to materials processing, such as cold drawing, environmental protection, as well as in the medicine domain [16–18], which features a very short treatment time [19, 20]. As a novel developing process, high-density pulse current in EPT has been proved to be an effective way t
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