Abstract
The effect of high-density pulsed electric current (HDPEC) on the microstructure evolution and corresponding changes in the mechanical properties of the deformed Ni-based alloy Inconel 718 was investigated. After HDPEC treatment, the strain hardening was fully relieved and the ductility recovered correspondingly. The results show that the dislocation density plays a dominant role, and the grain size has a side effect on the strain-hardening relief. Furthermore, the correlation between the mechanical properties and microstructure evolution affected by HDPEC was clarified. HDPEC treatment provides a way to alter the microstructure and thus tailor the mechanical properties of the deformed components. Hence, it is applicable to the metal-forming field to achieve rapid relief of strain hardening and enhance formability.
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Acknowledgements
The authors are grateful to the JSPS KAKENHI Grant-in-Aid for Scientific Research (S) 17H06146 for providing financial support for this study.
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Shaojie Gu contributed to the conceptualization, investigation, data curation, formal analysis, and writing of the original draft. Yi Cui helped in the validation, investigation, and writing—review and editing. Yasuhiro Kimura was involved in the data curation and writing—review and editing. Yuhki Toku helped in the validation and writing—review and editing. Yang Ju contributed to the conceptualization, methodology, supervision, project administration, resources, and writing—review and editing.
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Gu, S., Cui, Y., Kimura, Y. et al. Relief of strain hardening in deformed Inconel 718 by high-density pulsed electric current. J Mater Sci 56, 16686–16696 (2021). https://doi.org/10.1007/s10853-021-06344-9
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DOI: https://doi.org/10.1007/s10853-021-06344-9