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

Materials

Andrea Di Schino¹  Luca Pezzato²  Claudio Gennari²  Irene Calliari²  Gianmarco Tarabotti²  Andrea Zambon³ 

[1] Department of Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy;Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padua, Italy;Department of Management and Engineering, University of Padua, Stradella S. Nicola 3, 36100 Vicenza, Italy;

关键词: electroplastic effect;    pulsed current;    duplex stainless steel;    electropulsing treatment;    tensile test;   

DOI  :  10.3390/ma13071613

来源: DOAJ

【 摘 要 】

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 reference tensile tests performed before pulsing treatments. Increase in fracture strain was observed after pulsing treatment in comparison to the reference tensile tests. A decrease in microhardness was also observed after 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. Bulk temperature of the samples remained the same for all treatments duration. The effect are to be addressed to a combined effect of 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.

【 授权许可】

Unknown