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<p>The ultrasonic surface rolling process (USRP) was employed to improve the surface quality and corrosion resistance of 316L stainless steel produced through laser powder bed fusion. Four distinct parameter sets were established to identify the most effective corrosion resistance mechanism while varying only the static pressure. This study characterized the microstructure and corrosion resistance of the steel both before and after USRP treatment using primarily scanning electron microscopy, x-ray diffraction, and electrochemical corrosion methods. The findings indicate a notable enhancement in the surface integrity and corrosion resistance of 316L stainless steel post-USRP treatment; surface roughness decreased by 82.46%, the peak residual compressive stress reached 799.13&#xa0;MPa, and microhardness increased significantly by 48.15 HV0.5. At a static pressure of 550&#xa0;N, the USRP-treated specimen exhibited optimal corrosion resistance, with a reduction in self-corrosion current density of approximately 36%, leading to marked improvement in corrosion resistance.</p>

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Effect of Ultrasonic Surface Rolling Process on Surface Integrity and Corrosion Resistance of Laser Powder Bed Fusion 316L Stainless Steel under Different Static Load Forces

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Xue Yang,
  • Shubo Xu,
  • Renhui Liu

摘要

The ultrasonic surface rolling process (USRP) was employed to improve the surface quality and corrosion resistance of 316L stainless steel produced through laser powder bed fusion. Four distinct parameter sets were established to identify the most effective corrosion resistance mechanism while varying only the static pressure. This study characterized the microstructure and corrosion resistance of the steel both before and after USRP treatment using primarily scanning electron microscopy, x-ray diffraction, and electrochemical corrosion methods. The findings indicate a notable enhancement in the surface integrity and corrosion resistance of 316L stainless steel post-USRP treatment; surface roughness decreased by 82.46%, the peak residual compressive stress reached 799.13 MPa, and microhardness increased significantly by 48.15 HV0.5. At a static pressure of 550 N, the USRP-treated specimen exhibited optimal corrosion resistance, with a reduction in self-corrosion current density of approximately 36%, leading to marked improvement in corrosion resistance.