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<p>To address the problem of wear-induced failure in brake pads, laser cladding was applied to deposit self-lubricating and wear-resistant layers on gray cast iron substrates. Crack-free coatings were obtained under different laser scanning speeds of 4, 6, and 8&#xa0;mm/s. Experimental findings demonstrated that increasing the scanning velocity promoted finer microstructures, which in turn enhanced hardness. The corresponding average microhardness values were 457.93 HV<sub>0.5</sub>, 483.34 HV<sub>0.5</sub>, and 542.21 HV<sub>0.5</sub>. Faster scanning also contributed to lowering friction coefficients and wear rates at both ambient temperature and 300&#xa0;°C. The coating fabricated at 6&#xa0;mm/s demonstrated the most balanced performance. Nevertheless, an excessively high speed of 8&#xa0;mm/s generated significant residual stresses, leading to coating delamination and higher wear loss. At room temperature, abrasive wear was the predominant mechanism, whereas at 150&#xa0;°C, a mixed mode of abrasive and oxidative wear occurred. When the test temperature reached 300&#xa0;°C, the coatings primarily experienced severe oxidative wear.</p>

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Influence of Laser Scanning Speed on Properties of Laser-Clad Wear-Resistant Coatings on Cast Iron

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Zhengqiu Li,
  • Deming Zhang,
  • Zhihao Zhao,
  • Kaiping Du,
  • Zhiqiang Pi,
  • Wen Zhang,
  • Ming Pang

摘要

To address the problem of wear-induced failure in brake pads, laser cladding was applied to deposit self-lubricating and wear-resistant layers on gray cast iron substrates. Crack-free coatings were obtained under different laser scanning speeds of 4, 6, and 8 mm/s. Experimental findings demonstrated that increasing the scanning velocity promoted finer microstructures, which in turn enhanced hardness. The corresponding average microhardness values were 457.93 HV0.5, 483.34 HV0.5, and 542.21 HV0.5. Faster scanning also contributed to lowering friction coefficients and wear rates at both ambient temperature and 300 °C. The coating fabricated at 6 mm/s demonstrated the most balanced performance. Nevertheless, an excessively high speed of 8 mm/s generated significant residual stresses, leading to coating delamination and higher wear loss. At room temperature, abrasive wear was the predominant mechanism, whereas at 150 °C, a mixed mode of abrasive and oxidative wear occurred. When the test temperature reached 300 °C, the coatings primarily experienced severe oxidative wear.