Working Paper Article Version 2 This version is not peer-reviewed

Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel

Version 1 : Received: 17 March 2020 / Approved: 18 March 2020 / Online: 18 March 2020 (17:03:37 CET)
Version 2 : Received: 23 March 2020 / Approved: 25 March 2020 / Online: 25 March 2020 (09:00:25 CET)

A peer-reviewed article of this Preprint also exists.

Gennari, C.; Pezzato, L.; Tarabotti, G.; Zambon, A.; Di Schino, A.; Calliari, I. Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel. Materials 2020, 13, 1613. Gennari, C.; Pezzato, L.; Tarabotti, G.; Zambon, A.; Di Schino, A.; Calliari, I. Influence of Electropulsing Treatments on Mechanical Properties of UNS S32750 Duplex Stainless Steel. Materials 2020, 13, 1613.

Abstract

Prestrained at 5% and 15% duplex stainless steel UNS S32750 specimens have been subjected to electropulsing treatments with current density of 100 A/mm2 and 200 A/mm2 and 100 and 500 pulses for each current density value. Corrosion tests, X-ray diffraction, microhardness and residual stresses were collected before and after the electropulsing treatments. Tensile tests were performed after the electropulsing treatments in order to compare the mechanical response to the reference tensile tests performed before the pulsing treatments. Increase in fracture strain was observed after the pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after the electropulsing treatments for both degrees of prestrain. Electropulsing treatment almost eliminates the work-hardened state in the 5% prestrained specimens while partially recovered the 15% prestrained material increasing both uniform and fracture strain. The bulk temperature of the samples remained the same for all the duration of the treatments. The effect are to be addressed to a combined effect of the increase in atomic flux due to the electrical current and local joule heating in correspondence of crystal defects. Electropulsing treatment applied to metallic alloys is a promising technique to reduce the work hardening state without the need of annealing treatments in a dedicated furnace.

Keywords

electroplastic effect; pulsed current; duplex stainless steel; electropulsing traetment; residual stress; tensile test

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

Comments (1)

Comment 1
Received: 25 March 2020
Commenter: Claudio Gennari
Commenter's Conflict of Interests: Author
Comment: English was improved and changes suggested by reviewers were made
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