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<p>XH67MBTHO is a Ni-based super alloy used in the high-temperature regions of aerospace engines. Inherent characteristics like high strain hardening, high hot hardness, etc., reduce the tool’s life drastically during the machining of this alloy. Current study endeavors to enhance tool life through the application of cryogenic treatment and hard coatings, specifically with TiAlN, TiAlN/AlCrN, and TiAlN/TiAlN coating. During cryogenic treatment, the tool was subjected to − 196&#xa0;°C (for 24&#xa0;hr and 36&#xa0;hr) followed by tempering at 200 °C (for 2&#xa0;hr). Tool characterization using SEM and XRD was performed to understand the microstructural changes occur within the tool after cryogenic treatment. Statistical analysis using ANOVA identifies the significant parameters influencing tool life and surface roughness which includes coating type, treatment time, and spindle speed. TiAlN/TIN coated tool after 24&#xa0;hr treatment shows 94.3% improvement in wear resistance along with 73.9 and 51.16% reduction in surface roughness and cutting force, respectively. Enhanced wear resistance of TiAlN/TiN coatings may be attributed to the advantageous formation of tribo-oxide films, in conjunction with microstructural changes within the tool. Parametric optimization using desirability function approach recommend to use spindle speed of 498&#xa0;rpm with TiAlN/TiN coated tool after 22.37&#xa0;hr cryogenic treatment.</p>

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Wear Behavior of Cryogenically Treated TiAlN, TiAlN/TiN, and TiAlN/AlCrN Coated Tools during End Milling of XH67MBTHO

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Jayaram C. Sasi,
  • Jose Mathew

摘要

XH67MBTHO is a Ni-based super alloy used in the high-temperature regions of aerospace engines. Inherent characteristics like high strain hardening, high hot hardness, etc., reduce the tool’s life drastically during the machining of this alloy. Current study endeavors to enhance tool life through the application of cryogenic treatment and hard coatings, specifically with TiAlN, TiAlN/AlCrN, and TiAlN/TiAlN coating. During cryogenic treatment, the tool was subjected to − 196 °C (for 24 hr and 36 hr) followed by tempering at 200 °C (for 2 hr). Tool characterization using SEM and XRD was performed to understand the microstructural changes occur within the tool after cryogenic treatment. Statistical analysis using ANOVA identifies the significant parameters influencing tool life and surface roughness which includes coating type, treatment time, and spindle speed. TiAlN/TIN coated tool after 24 hr treatment shows 94.3% improvement in wear resistance along with 73.9 and 51.16% reduction in surface roughness and cutting force, respectively. Enhanced wear resistance of TiAlN/TiN coatings may be attributed to the advantageous formation of tribo-oxide films, in conjunction with microstructural changes within the tool. Parametric optimization using desirability function approach recommend to use spindle speed of 498 rpm with TiAlN/TiN coated tool after 22.37 hr cryogenic treatment.