Scholarlink

<p>In order to overcome the limitations of conventional hard-coated tools in high-speed dry cutting, this study focuses on enhancing both the adhesion strength and mechanical properties of PVD hard coatings. This was achieved through microstructural design and the incorporation of interlayer transitions to enhance the machinability of high-speed steel tools. Three coatings with distinct microstructures were prepared on high-speed steel, including a CrAlN + TiSiN bilayer, a Cr-CrN-CrAlN + TiSiN bilayer, and a Cr-CrN-CrAlN/TiSiN multilayer. The mechanical properties, high-temperature tribology, and dry milling performance of these multilayer structures were subsequently evaluated. The results indicate that Cr-CrN-CrAlN/TiSiN multilayer exhibits superior nanohardness (37.2 ± 2.9&#xa0;GPa), elastic modulus (565.2 ± 23.2&#xa0;GPa), H<sup>3</sup>/E<sup>2</sup> ratio (0.162 ± 0.016&#xa0;GPa), bonding strength (Lc2 = 63.43&#xa0;N), a stable coefficient of friction (0.61) and low wear rate at 500&#xa0;°C (0.14 × 10<sup>−6</sup>&#xa0;mm<sup>3</sup>/Nm). Furthermore, cutting tests on SKD11 die steel showed that the failures of the coated tools were primarily due to coating delamination, leading to abrasive wear, adhesive wear, and oxidative wear. The Cr-CrN-CrAlN/TiSiN multilayer significantly enhances high-temperature resistance and cutting wear performance, with tool life reaching three times that of uncoated tools, thereby presenting itself as a promising candidate for high-speed dry cutting applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of Microstructure Design on High-Temperature Tribological and Cutting Properties of PVD Hard Coatings

  • 期刊论文

  • 发表日期：

    2025年10月27日

查看全文
  • Chunling Li,
  • Yuan Gao,
  • Lunlin Shang,
  • Haimin Zhai

摘要

In order to overcome the limitations of conventional hard-coated tools in high-speed dry cutting, this study focuses on enhancing both the adhesion strength and mechanical properties of PVD hard coatings. This was achieved through microstructural design and the incorporation of interlayer transitions to enhance the machinability of high-speed steel tools. Three coatings with distinct microstructures were prepared on high-speed steel, including a CrAlN + TiSiN bilayer, a Cr-CrN-CrAlN + TiSiN bilayer, and a Cr-CrN-CrAlN/TiSiN multilayer. The mechanical properties, high-temperature tribology, and dry milling performance of these multilayer structures were subsequently evaluated. The results indicate that Cr-CrN-CrAlN/TiSiN multilayer exhibits superior nanohardness (37.2 ± 2.9 GPa), elastic modulus (565.2 ± 23.2 GPa), H3/E2 ratio (0.162 ± 0.016 GPa), bonding strength (Lc2 = 63.43 N), a stable coefficient of friction (0.61) and low wear rate at 500 °C (0.14 × 10−6 mm3/Nm). Furthermore, cutting tests on SKD11 die steel showed that the failures of the coated tools were primarily due to coating delamination, leading to abrasive wear, adhesive wear, and oxidative wear. The Cr-CrN-CrAlN/TiSiN multilayer significantly enhances high-temperature resistance and cutting wear performance, with tool life reaching three times that of uncoated tools, thereby presenting itself as a promising candidate for high-speed dry cutting applications.