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

机译：电脉冲处理对UNS S32750双相不锈钢力学性能的影响

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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/mm and 200 A/mm 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.
机译：对预应力为5％和15％的双相不锈钢UNS S32750标本进行了电脉冲处理，每个电流密度值的电流密度分别为100 A / mm和200 A / mm，以及100和500个脉冲。在电脉冲处理之前和之后收集腐蚀测试，X射线衍射，显微硬度和残余应力。在电脉冲处理之后进行拉伸测试，以便将机械响应与在脉冲处理之前进行的参考拉伸测试进行比较。与参考拉伸试验相比，脉冲处理后观察到断裂应变增加。在两种预应变程度的电脉冲处理后，还观察到显微硬度的降低。电脉冲处理几乎消除了5％预应变试样​​的加工硬化状态，同时部分恢复了15％预应变材料，增加了均匀应变和断裂应变。在所有处理期间，样品的体温保持相同。该效应将针对由于电流和晶体缺陷对应的局部焦耳加热而导致的原子通量增加的综合效应。对金属合金进行电脉冲处理是一种有希望的技术，它可以减少加工硬化状态，而无需在专用炉中进行退火处理。

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