Achieving Stress Relief in Martensitic Stainless Steel Via High-Density Pulsed Electric Current Treatment

Metallurgical and Materials Transactions A Pub Date : 2024-07-20 DOI:10.1007/s11661-024-07522-5

Shaojie Gu, Daisuke Kobayashi, Xinming Yan, Chang Liu, Yasuhiro Kimura, Yuhki Toku, Yang Ju

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Abstract

This study examined the effect of high-density pulsed electric current (HDPEC) treatment on the residual stress relief of martensitic stainless steel SCS6. The findings indicate that applying HDPEC at 100 A/mm² for 370 ms, or equivalent current conditions at a maximum temperature of approximately 735 °C, can nearly eliminate surface residual stresses. Moreover, this treatment resulted in a 7 pct increase in strength without deteriorating the ductility. X-ray diffraction and electron backscatter diffraction analysis found that defects (i.e., dislocations) within the grains were remarkably removed, which was the main reason for the residual stress removal. This study demonstrates the feasibility of HDPEC in eliminating residual stresses of martensitic stainless steels, presenting a promising alternative to traditional heat treatment. In addition, this method introduces possibilities for localized non-destructive treatments on substantial components, enabling rapid and straightforward repairs.

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通过高密度脉冲电流处理实现马氏体不锈钢应力消除

本研究探讨了高密度脉冲电流（HDPEC）处理对马氏体不锈钢 SCS6 残余应力消除的影响。研究结果表明，在最高温度约为 735 ℃ 的条件下，以 100 A/mm2 的电流施加 HDPEC 370 毫秒或同等电流条件，几乎可以消除表面残余应力。此外，这种处理方法还能在不降低延展性的情况下将强度提高 7%。X 射线衍射和电子反向散射衍射分析发现，晶粒内部的缺陷（即位错）被明显消除，这是残余应力消除的主要原因。这项研究证明了 HDPEC 在消除马氏体不锈钢残余应力方面的可行性，为传统热处理提供了一种可行的替代方法。此外，这种方法还可对大型部件进行局部无损处理，从而实现快速、直接的维修。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Metallurgical and Materials Transactions A

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