Strengthening of Mechanical Engineering Parts Using Chemical-Thermocycling Treatment
[ 1 ] Instytut Technologii Materiałów, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] pracownik
2023
rozdział w monografii naukowej / referat
angielski
- AISI 5120
- Diffusion Saturation
- Cementation
- Process Innovation
- Thermocycling Cementation
- Microhardness
- Working Capacity
- Industrial Growth
EN This work is devoted to studying the process of thermocycling cementation for the thermal strengthening of machine-building parts. The effect of diffusion saturation under conditions of thermocycling influence on the structure and properties of AISI 5120 steel was studied. A comparative analysis of the structure and properties was conducted after various thermal, chemical-thermal, and chemical-thermocycling treatments. The technology of chemical-thermocycling processing with different cycles has been developed. The thickness of the diffusion layer, its microhardness, and the distribution of carbon over the thickness of the saturated layer were determined. The study of the structure of products that underwent thermocycling cementation showed that carbide inclusions throughout the thickness of the layer had a rounded shape and small sizes. In the cemented layer obtained by the traditional (isothermal) processing method, carbides were located mainly along the grain boundaries as a grid. The method of thermocycling as a method of thermal treatment is based on the constant accumulation from cycle to cycle of positive changes in the structure of metals. It was shown that thermocycling directly in cementation processes allows the necessary diffusion enrichment of the surface layers with metals or non-metals from the external active medium in a shorter time than during isothermal exposure. It has been experimentally proven that the final thermocycling of cemented steels reduces the duration of the process by 1.3–1.8 times.
23.05.2023
199 - 210
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