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<p>This study systematically examines how different shot peening (SP) intensities (0, 0.3, 0.45, and 0.6&#xa0;MPa) affect the surface morphology, microstructural evolution, mechanical behavior, and wear performance of DP980 dual-phase steel. The results show that increasing SP intensity leads to a gradual thickening of the surface plastic deformation layer and a significant refinement of surface grains, accompanied by higher dislocation density. These microstructural modifications enhance surface hardness and strength, with hardness increasing from 289.4 HV in the untreated sample to 378.3 HV at 0.6&#xa0;MPa, and yield strength rising from 367.8&#xa0;MPa to 901.6&#xa0;MPa. The enhanced hardness and compressive residual stress contribute to improved tribological performance, reducing both friction coefficient and wear rate with increasing SP intensity. The findings demonstrate that SP effectively tailors the near-surface microstructure of DP980 steel and substantially improves its surface-dependent mechanical and wear properties.</p>

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Effect of Shot Peening Intensity on Microstructure, Mechanical Properties and Wear of DP980 Steel

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Dongwei Jiang,
  • Haijun Pan,
  • Wenyu Tao,
  • Lin Liu,
  • Zhiqiang Wu,
  • Zhihui Cai

摘要

This study systematically examines how different shot peening (SP) intensities (0, 0.3, 0.45, and 0.6 MPa) affect the surface morphology, microstructural evolution, mechanical behavior, and wear performance of DP980 dual-phase steel. The results show that increasing SP intensity leads to a gradual thickening of the surface plastic deformation layer and a significant refinement of surface grains, accompanied by higher dislocation density. These microstructural modifications enhance surface hardness and strength, with hardness increasing from 289.4 HV in the untreated sample to 378.3 HV at 0.6 MPa, and yield strength rising from 367.8 MPa to 901.6 MPa. The enhanced hardness and compressive residual stress contribute to improved tribological performance, reducing both friction coefficient and wear rate with increasing SP intensity. The findings demonstrate that SP effectively tailors the near-surface microstructure of DP980 steel and substantially improves its surface-dependent mechanical and wear properties.