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<p>In this work, thermochemical boriding in a salt bath composed of 70% borax and 30% silicon carbide was applied to austenitic AISI 316L stainless steel using boriding temperatures of 850, 950, and 1000&#xa0;°C with holding times of 2, 4, and 6&#xa0;h. This treatment resulted in the formation of the boride Fe<sub>2</sub>B monolayer, which was confirmed by X-ray diffraction analysis, optical microscopy, and scanning electron microscopy. It has been found that the thickness of the boride layer increases proportionally with the temperature and the duration of the boriding. In addition, the surface hardness of AISI 316L improved by the boriding process. For the microhardness measured with a load of 20&#xa0;g, we obtained 255 ± 51 HV for the substrate and 1828 ± 64 HV as the maximum value for the boride layer. The wear behavior of the boriding samples was tested using the ball-on-disk wear method in a simulated body fluid (Hank’s solution). The tribological characteristics of three AISI 316L stainless steel samples, each subjected to distinct surface treatments including electrolytic polishing, mechanical polishing, and boriding followed by mechanical polishing, were tested in this study. The results show that the boriding treatment positively affects the wear resistance by increasing the surface hardness and reducing the friction coefficient.</p>

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Sliding wear behavior of AISI 316L stainless steel treated by boriding in molten salts

  • 期刊论文

  • 发表日期：

    2025年10月4日

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  • Mohammed Amine Khater,
  • Chaaben Arroussi,
  • Malik Yahiaoui,
  • Mohamed Abid

摘要

In this work, thermochemical boriding in a salt bath composed of 70% borax and 30% silicon carbide was applied to austenitic AISI 316L stainless steel using boriding temperatures of 850, 950, and 1000 °C with holding times of 2, 4, and 6 h. This treatment resulted in the formation of the boride Fe2B monolayer, which was confirmed by X-ray diffraction analysis, optical microscopy, and scanning electron microscopy. It has been found that the thickness of the boride layer increases proportionally with the temperature and the duration of the boriding. In addition, the surface hardness of AISI 316L improved by the boriding process. For the microhardness measured with a load of 20 g, we obtained 255 ± 51 HV for the substrate and 1828 ± 64 HV as the maximum value for the boride layer. The wear behavior of the boriding samples was tested using the ball-on-disk wear method in a simulated body fluid (Hank’s solution). The tribological characteristics of three AISI 316L stainless steel samples, each subjected to distinct surface treatments including electrolytic polishing, mechanical polishing, and boriding followed by mechanical polishing, were tested in this study. The results show that the boriding treatment positively affects the wear resistance by increasing the surface hardness and reducing the friction coefficient.