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<p>TC16 titanium alloy, a two-phase martensitic alloy, has extensive applications in the aerospace field. However, its low surface hardness and wear resistance impact its structural safety. The surface properties can be substantially improved via surface nitriding technology. In this work, an intermittent vacuum diffusion nitriding (IVDN) treatment was performed to enhance the surface properties of TC16 titanium alloy. The fundamental microstructure and characteristics of the nitriding layer were investigated. Consequently, TiN grains preferentially nucleated and continued to grow at <i>α</i>-Ti grain boundaries, creating dislocations in adjacent <i>α</i>-Ti grains. These dislocations assisted in facilitating the diffusion of N atoms into the internal matrix, preparing a considerable thickness nitriding layer. After conducting the IVDN process on the TC16 titanium alloy at 800&#xa0;°C for 10&#xa0;h, the surface microhardness sharply increased to about 850-900 HV, which was about thrice the substrate’s hardness. The wear test was executed for 30 min under the same wear conditions. The wear loss weight of the nitrided sample was only one-eighth that of the untreated sample, and the nitriding layer was still not worn off and remained relatively intact. The IVDN sample exhibited more wear resistance than the untreated sample because of the high surface hardness of the nitriding layer and outstanding compact bonding to the substrate.</p>

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Preparation and Mechanical Properties of TiN-based Compound Layer on TC16 Titanium Alloy Using Intermittent Vacuum Diffusion Nitriding

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Xiaoyan Yang,
  • Chuang Yang

摘要

TC16 titanium alloy, a two-phase martensitic alloy, has extensive applications in the aerospace field. However, its low surface hardness and wear resistance impact its structural safety. The surface properties can be substantially improved via surface nitriding technology. In this work, an intermittent vacuum diffusion nitriding (IVDN) treatment was performed to enhance the surface properties of TC16 titanium alloy. The fundamental microstructure and characteristics of the nitriding layer were investigated. Consequently, TiN grains preferentially nucleated and continued to grow at α-Ti grain boundaries, creating dislocations in adjacent α-Ti grains. These dislocations assisted in facilitating the diffusion of N atoms into the internal matrix, preparing a considerable thickness nitriding layer. After conducting the IVDN process on the TC16 titanium alloy at 800 °C for 10 h, the surface microhardness sharply increased to about 850-900 HV, which was about thrice the substrate’s hardness. The wear test was executed for 30 min under the same wear conditions. The wear loss weight of the nitrided sample was only one-eighth that of the untreated sample, and the nitriding layer was still not worn off and remained relatively intact. The IVDN sample exhibited more wear resistance than the untreated sample because of the high surface hardness of the nitriding layer and outstanding compact bonding to the substrate.