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<p>In this study, 55CrSi spring steel was subjected to shot peening (SP) and the combination of conventional shot peening and tungsten particle shot peening (SP + TPSP). The deformation layer was characterized in terms of surface topography, microstructure, residual stress, and austenite transformation, and a three-point bending fatigue test was conducted. The results showed that compared with SP, the sample treated with SP + TPSP showed the maximum compressive residual stress (CRS), with a value of − 1015&#xa0;MPa at a depth of 100&#xa0;μm below the surface. Meanwhile, the surface hardness increased to 794&#xa0;HV. Both the arithmetic mean roughness (Ra) and the average roughness of regional morphology (Sa) of the surface were significantly reduced. Moreover, SP + TPSP obtained deeper deformation layer and higher dislocation density and induced the transformation of retained austenite to martensite, forming crystallographic texture. Compared with SP, the fatigue performance was about 5.7 × 10<sup>4</sup> cycles, which was increased by 90%. Furthermore, SEM and EBSD were conducted to analyze the microstructure, and the synergistic effect of subsurface microstructure change and surface integrity on fatigue performance was discussed.</p>

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Effect of tungsten particle shot peening on microstructure and fatigue properties of 55CrSi spring steel

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Fengyi Liu,
  • Xianqiang Cao,
  • Jilong Ren,
  • Peng Qi,
  • Ertuan Zhao,
  • Yisheng Feng

摘要

In this study, 55CrSi spring steel was subjected to shot peening (SP) and the combination of conventional shot peening and tungsten particle shot peening (SP + TPSP). The deformation layer was characterized in terms of surface topography, microstructure, residual stress, and austenite transformation, and a three-point bending fatigue test was conducted. The results showed that compared with SP, the sample treated with SP + TPSP showed the maximum compressive residual stress (CRS), with a value of − 1015 MPa at a depth of 100 μm below the surface. Meanwhile, the surface hardness increased to 794 HV. Both the arithmetic mean roughness (Ra) and the average roughness of regional morphology (Sa) of the surface were significantly reduced. Moreover, SP + TPSP obtained deeper deformation layer and higher dislocation density and induced the transformation of retained austenite to martensite, forming crystallographic texture. Compared with SP, the fatigue performance was about 5.7 × 104 cycles, which was increased by 90%. Furthermore, SEM and EBSD were conducted to analyze the microstructure, and the synergistic effect of subsurface microstructure change and surface integrity on fatigue performance was discussed.