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<p>The objective of this work is to study the mechanical behavior of chrome molybdenum steel subjected to a mechanical surface treatment, specifically burnishing by varying the number of passes and the applied pressure, in order to evaluate the mechanical properties such as microhardness (Hv), Young’s modulus (E), and the induced compressive residual stresses. Friction tests were also conducted to determine the coefficient of friction and assess the wear resistance of the surface. Structural analysis and estimation of micro-strains were performed by x-ray diffraction, through Rietveld refinement. Measurements of microhardness and Young’s modulus were carried out through indentation tests, and the worn surface after friction was evaluated using a 3D profilometer. The results show an increase in micro-strains for the surface treated with maximum parameters (<i>P</i> = 20 kgf, <i>i</i> = 4), as well as an improvement in surface hardness, reaching a maximum value of 254.57 Hv, representing a 17.5% increase compared to the untreated surface, and Young’s modulus follows the same trend as superficial hardness. Additionally, a reduction in the coefficient friction, ranging from 16 to 30% compared to the undeformed surface, was recorded. A correlation between the wear rate and micro-strains was also identified, indicating that the predominant wear mechanism is adhesive wear.</p>

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Investigation of the Mechanical Characteristics and Tribological Performance of a Chrome Molybdenum Steel After Ball Burnishing

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Mounira Bourebia,
  • Soumaya Meddah,
  • Sihem Achouri,
  • Amel Oulabbas,
  • Alima Mebrek,
  • Noël Brunetiere,
  • Lakhdar Laouar,
  • Walid Ghennai,
  • Ahlem Taleb,
  • Abdeljalil Haddad,
  • Salah Remili

摘要

The objective of this work is to study the mechanical behavior of chrome molybdenum steel subjected to a mechanical surface treatment, specifically burnishing by varying the number of passes and the applied pressure, in order to evaluate the mechanical properties such as microhardness (Hv), Young’s modulus (E), and the induced compressive residual stresses. Friction tests were also conducted to determine the coefficient of friction and assess the wear resistance of the surface. Structural analysis and estimation of micro-strains were performed by x-ray diffraction, through Rietveld refinement. Measurements of microhardness and Young’s modulus were carried out through indentation tests, and the worn surface after friction was evaluated using a 3D profilometer. The results show an increase in micro-strains for the surface treated with maximum parameters (P = 20 kgf, i = 4), as well as an improvement in surface hardness, reaching a maximum value of 254.57 Hv, representing a 17.5% increase compared to the untreated surface, and Young’s modulus follows the same trend as superficial hardness. Additionally, a reduction in the coefficient friction, ranging from 16 to 30% compared to the undeformed surface, was recorded. A correlation between the wear rate and micro-strains was also identified, indicating that the predominant wear mechanism is adhesive wear.