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Updated: Jul 27, 2025
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Micromechanical Tension Testing of Additively Manufactured 17-4 PH Stainless Steel Specimens
Published on: April 7, 2021
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Electroplastic Effect during Tension and Bending in Duplex Stainless Steel
Mikhail Pakhomov1, Oleg Korolkov1, Mirko Pigato2
1Mechanical Engineering Research Institute of RAS, 101990 Moscow, Russia.
Materials (Basel, Switzerland)
|June 10, 2023
Summary
Multi-pulse current significantly enhances electroplastic effects in duplex stainless steel, reducing flow stress more than external heating. This effect is strain-rate independent for multi-pulse currents.
Area of Science:
- Materials Science
- Metallurgy
- Mechanical Engineering
Background:
- Duplex stainless steel exhibits unique mechanical properties.
- Understanding deformation behavior under external stimuli is crucial for material processing.
- The electroplastic effect (EPE) offers a novel method for material modification.
Purpose of the Study:
- To investigate the deformation behavior of duplex stainless steel under tensile and bending loads.
- To compare the effects of pulsed electric current and external heating on flow stress.
- To analyze the influence of strain rate on the electroplastic effect.
Main Methods:
- Tensile and bending tests on duplex stainless steel.
- Application of single-pulse and multi-pulse electric currents.
- External heating as a comparative method.
- Analysis of stress-strain curves and strain rate effects.
Main Results:
- Multi-pulse current application resulted in a greater decrease in flow stress compared to external heating.
- A significant electroplastic effect was confirmed.
- Strain rate increase by an order of magnitude reduced EPE contribution from single pulses by 20%.
- The strain rate effect was not observed for multi-pulse currents.
- Multi-pulse current during bending reduced bending strength by 50% and springback angle to 6.5°.
Conclusions:
- Multi-pulse current is more effective than external heating in reducing flow stress due to the electroplastic effect.
- The electroplastic effect in duplex stainless steel is largely independent of strain rate when using multi-pulse currents.
- Pulsed currents offer a viable method for modifying mechanical properties, such as reducing bending strength and springback.
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