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Abstract <p>Increasing the durability and survivability of machine parts and mechanisms largely depends on the strength and wear resistance of the material from which they are made. As an alternative to bulk alloying of steels to increase their strength and wear resistance, various methods of creating protective coatings can be used, including thermochemical treatment (TCT) and additive technologies. The paper studies the possibility of simultaneously saturating the metal surface with chromium and cobalt, since these alloying elements provide not only high corrosion resistance of the coating but also excellent wear resistance and cutting properties. To create chromium-cobalt coatings, the work considers the technology of thermal diffusion saturation and laser surfacing with stellite 6. Thermal diffusion saturation of 35Kh2N3 steel with chromium and cobalt was carried out at a temperature of 1000°C. Surfacing of stellite 6 on the surface of the same sample was carried out on a robotic laser installation FL-Clad-R-4. The study of the obtained coatings was carried out according to a technique based on the capabilities of X-ray spectral microanalysis (XSM) of the diffusion layer on transverse microsections of the obtained samples. Control of the elemental composition of the diffusion layer was carried out on a JEOL JSM-6460 LV universal scanning (raster) electron microscope. The study of the microstructure was carried out on an Axio Observer D1.m optical metallographic microscope. X-ray phase analysis was carried out on a Rigaku Ultima IV diffractometer. Hardness measurements were carried out on a FM-800 microhardness tester at loads of 50 and 300 g. On the basis of the combination of properties obtained, the thermal diffusion method of creating chromium-cobalt coatings on parts of finite dimensions is the most effective, including for mass production. With the additive method of creating coatings, the duration of laser heating is insufficient to ensure the diffusion of surfacing elements into the base metal. Therefore, to obtain the same chromium and cobalt content on the surface of the part, it is necessary to provide an allowance for mechanical processing of parts with incomplete removal of the deposited layer.</p>

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Comparative Analysis of Structure and Properties of Chromium-Cobalt Coating Obtained by Diffusion Saturation and Laser Surface Cladding

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • N. A. Shaburova,
  • K. Yu. Pashkeyev,
  • V. A. Myasoedov

摘要

Abstract

Increasing the durability and survivability of machine parts and mechanisms largely depends on the strength and wear resistance of the material from which they are made. As an alternative to bulk alloying of steels to increase their strength and wear resistance, various methods of creating protective coatings can be used, including thermochemical treatment (TCT) and additive technologies. The paper studies the possibility of simultaneously saturating the metal surface with chromium and cobalt, since these alloying elements provide not only high corrosion resistance of the coating but also excellent wear resistance and cutting properties. To create chromium-cobalt coatings, the work considers the technology of thermal diffusion saturation and laser surfacing with stellite 6. Thermal diffusion saturation of 35Kh2N3 steel with chromium and cobalt was carried out at a temperature of 1000°C. Surfacing of stellite 6 on the surface of the same sample was carried out on a robotic laser installation FL-Clad-R-4. The study of the obtained coatings was carried out according to a technique based on the capabilities of X-ray spectral microanalysis (XSM) of the diffusion layer on transverse microsections of the obtained samples. Control of the elemental composition of the diffusion layer was carried out on a JEOL JSM-6460 LV universal scanning (raster) electron microscope. The study of the microstructure was carried out on an Axio Observer D1.m optical metallographic microscope. X-ray phase analysis was carried out on a Rigaku Ultima IV diffractometer. Hardness measurements were carried out on a FM-800 microhardness tester at loads of 50 and 300 g. On the basis of the combination of properties obtained, the thermal diffusion method of creating chromium-cobalt coatings on parts of finite dimensions is the most effective, including for mass production. With the additive method of creating coatings, the duration of laser heating is insufficient to ensure the diffusion of surfacing elements into the base metal. Therefore, to obtain the same chromium and cobalt content on the surface of the part, it is necessary to provide an allowance for mechanical processing of parts with incomplete removal of the deposited layer.