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<p>The effect of ultrasonic surface rolling process (USRP) with different static loads on hydrogen permeation and hydrogen embrittlement (HE) of 2205 duplex stainless steel (DSS) was investigated. The results show that USRP introduces a plastic deformation layer and compressive residual stress (CRS) on the material surface. With increasing static load, the CRS-affected depth increases from approximately 550–750&#xa0;μm, accompanied by surface microstructural refinement and dislocation multiplication. These USRP-induced microstructures hinder hydrogen permeation, as evidenced by the decreased hydrogen permeation flux and the reduction in the effective hydrogen diffusion coefficient from 7.34 × 10<sup>−9</sup>–2.51 × 10<sup>−9</sup>&#xa0;cm<sup>2</sup>/s. In addition, the HE index decreases from 21.58% for the AR specimen to 7.02% for the USRPed specimen, together with a reduced brittle fracture layer depth. The improved HE resistance is mainly attributed to the USRP-induced CRS, grain refinement, high-density dislocations, and reduced surface roughness which jointly suppress hydrogen permeation and HE in 2205 DSS.</p>

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Effect of ultrasonic surface rolling process on the hydrogen embrittlement susceptibility of 2205 duplex stainless steel

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Shu Huang,
  • Chaojun Zhao,
  • Jie Sheng,
  • Qinqing Sha,
  • Emmanuel Agyenim-Boateng,
  • Yutang Qi,
  • Zixiang Ruan,
  • Chenxiang Wang,
  • Bin Wu,
  • Mingliang Zhu

摘要

The effect of ultrasonic surface rolling process (USRP) with different static loads on hydrogen permeation and hydrogen embrittlement (HE) of 2205 duplex stainless steel (DSS) was investigated. The results show that USRP introduces a plastic deformation layer and compressive residual stress (CRS) on the material surface. With increasing static load, the CRS-affected depth increases from approximately 550–750 μm, accompanied by surface microstructural refinement and dislocation multiplication. These USRP-induced microstructures hinder hydrogen permeation, as evidenced by the decreased hydrogen permeation flux and the reduction in the effective hydrogen diffusion coefficient from 7.34 × 10−9–2.51 × 10−9 cm2/s. In addition, the HE index decreases from 21.58% for the AR specimen to 7.02% for the USRPed specimen, together with a reduced brittle fracture layer depth. The improved HE resistance is mainly attributed to the USRP-induced CRS, grain refinement, high-density dislocations, and reduced surface roughness which jointly suppress hydrogen permeation and HE in 2205 DSS.