Abstract
Hybrid technologies are one of the directions of materials engineering development. They contribute to the subject of research on improving the performance of thermally sprayed steel coatings by thermo-chemical treatment. The paper presents the test results of arc spraying stainless steel coatings and then glow-discharge nitrided. The glow-discharge nitriding was performed with the following parameters: at 450 °C for 6 hours and at 530 °C for 4 hours. The results of the following tests are described and presented: metallographic (SEM), qualitative and quantitative analysis point EDS, measurement of hardness HV, hardness distribution, measurement of roughness parameters (Ra, Rz), wear resistance by the Amsler method. The results showed that the glow-discharge nitriding increases the hardness and the frictional wear resistance of thermal sprayed stainless steel X46Cr13 and X2CrNi18-9 coatings. The hybrid technology, combining thermal spraying of martensitic stainless steel X46Cr13 and glow-discharge nitriding at 530 °C for 4 hours, provides formation of a coating with the highest hardness and wear resistance of all the tested coatings. This coating can be applied to the regeneration of machine parts, which are required to have particularly high useful properties.
Highlights
The results showed that the glow-discharge nitriding increases the hardness and the frictional wear resistance of thermal sprayed stainless steel X46Cr13 and X2CrNi18-9 coatings
Thermal spraying technology is used to apply coatings on new machine parts in order to improve the usable properties of their surfaces or to regenerate worn parts [1÷8]
Glow-discharge nitriding at 530 °C for 4 h of thermally sprayed X46Cr13 steel coatings creates a surface diffusion layer with a thickness of approx. 50 μm, characterized by high hardness (1108 HV0.1) and very good resistance to wear due to friction
Summary
Thermal spraying technology is used to apply coatings on new machine parts in order to improve the usable properties of their surfaces or to regenerate worn parts [1÷8]. In order to increase the properties of thermal sprayed coatings, one of the surface engineering technologies can be used Such technology, improving both mechanical properties, e.g. hardness, resistance to wear, as well as anti-corrosion properties of the surface layers by modification of its chemical composition and microstructure is called glow-discharge nitriding. The glow-discharge nitriding technology is more and more widely used in industry as an effective and economical method of increasing the usable properties of machine parts and tools. The advantage of this method is the ability to precisely regulate the structure of the nitrided layer, conduct the process at a temperature of as little as 400 °C, and the ability to regulate the phase composition of the produced layers by changing the chemical composition of the reactive atmosphere, which allows the production of composite layers in one technological process. The paper investigates the effect of the glow-discharge nitriding process, with different process parameters, on the microstructure and properties of the thermally sprayed stainless steel coatings
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