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<p>This study conducts a comparative analysis of SLM 316L stainless steel samples with three different surface conditions (SLM untreated sample, USP-1min, USP-3min). Firstly, scanning electron microscopy (SEM), 3D profilometry, electron backscatter diffraction (EBSD), and nanoindenter were used to analyze the surface and cross-sectional states of the samples. It was found that compared to untreated samples, the surface roughness of the USP-treated samples decreased by 35% and 45%, respectively. Cross-sectional EBSD analysis showed that with increased shot peening time, the subsurface grain size of the USP samples continued to refine, with subsurface nano-hardness increasing by 29% and 32%, respectively. Secondly, friction and wear tests indicated that the wear depth of the USP-treated samples was significantly reduced compared to untreated samples, particularly under a 15 N normal load, with wear depth reduced by 36% and 54% for the two USP samples, respectively. The results show that the surface flatness of the specimens treated with USP has improved significantly, surface roughness decreased further, and a noticeable grain refinement layer formed in the subsurface layer, accompanied by a high-density dislocation network, resulting in higher hardness characteristics and excellent resistance to plastic deformation, thereby significantly enhancing their tribological performance.</p>

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Application Study of Improving Wear Resistance of Selective Laser Melting 316L Stainless Steel by Ultrasonic Shot Peening Technology

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Zhi-biao Xu,
  • Xin-yi Zeng,
  • Xing Xu,
  • Hao Wu

摘要

This study conducts a comparative analysis of SLM 316L stainless steel samples with three different surface conditions (SLM untreated sample, USP-1min, USP-3min). Firstly, scanning electron microscopy (SEM), 3D profilometry, electron backscatter diffraction (EBSD), and nanoindenter were used to analyze the surface and cross-sectional states of the samples. It was found that compared to untreated samples, the surface roughness of the USP-treated samples decreased by 35% and 45%, respectively. Cross-sectional EBSD analysis showed that with increased shot peening time, the subsurface grain size of the USP samples continued to refine, with subsurface nano-hardness increasing by 29% and 32%, respectively. Secondly, friction and wear tests indicated that the wear depth of the USP-treated samples was significantly reduced compared to untreated samples, particularly under a 15 N normal load, with wear depth reduced by 36% and 54% for the two USP samples, respectively. The results show that the surface flatness of the specimens treated with USP has improved significantly, surface roughness decreased further, and a noticeable grain refinement layer formed in the subsurface layer, accompanied by a high-density dislocation network, resulting in higher hardness characteristics and excellent resistance to plastic deformation, thereby significantly enhancing their tribological performance.