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<p>Substrate preparation is known to influence the tribological performance of coated tool steels. However, despite extensive research on the subject, accurately predicting the impact of substrate roughness on the tribological performance of a given coated tool steel remains a prevalent challenge due to its significant variation with the coating-substrate combination. Therefore, this study investigates the effect of the substrate roughness (<i>R</i><sub>a</sub> = 0.0025 to 1.7&#xa0;<i>µ</i>m) on the tribological behaviour of AlTiN/AlTiCrN-coated AISI A8 tool steel widely used in the woodcutting industry. The coated tool steel with varied roughness is evaluated through a comprehensive series of tests, including wear, nanoindentation, adhesion, profilometry, and microstructural characterizations. The results reveal that smoother substrates exhibit superior performance, characterized by about 15 pct lower wear rates. This improvement is attributed to the enhancement of the (111) plane orientation, which contributes to improved adhesion, increased hardness, and greater fracture resistance, alongside a higher density of fine macroparticles and reduced surface roughness. Based on these findings, optimizing the substrate roughness to achieve a smoother surface for AlTiN/AlTiCrN-coated AISI A8 tool steel appears promising for enhancing tribological performance.</p>

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Effect of Substrate Roughness on the Tribological Performance of AlTiN/AlTiCrN-Coated A8 Tool Steel

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Musa Muhammed,
  • Mousa Javidani,
  • Majid Heidari,
  • Tom Levasseur,
  • Mohammad Jahazi

摘要

Substrate preparation is known to influence the tribological performance of coated tool steels. However, despite extensive research on the subject, accurately predicting the impact of substrate roughness on the tribological performance of a given coated tool steel remains a prevalent challenge due to its significant variation with the coating-substrate combination. Therefore, this study investigates the effect of the substrate roughness (Ra = 0.0025 to 1.7 µm) on the tribological behaviour of AlTiN/AlTiCrN-coated AISI A8 tool steel widely used in the woodcutting industry. The coated tool steel with varied roughness is evaluated through a comprehensive series of tests, including wear, nanoindentation, adhesion, profilometry, and microstructural characterizations. The results reveal that smoother substrates exhibit superior performance, characterized by about 15 pct lower wear rates. This improvement is attributed to the enhancement of the (111) plane orientation, which contributes to improved adhesion, increased hardness, and greater fracture resistance, alongside a higher density of fine macroparticles and reduced surface roughness. Based on these findings, optimizing the substrate roughness to achieve a smoother surface for AlTiN/AlTiCrN-coated AISI A8 tool steel appears promising for enhancing tribological performance.