Wear resistance of structural steels carbonitrated by the separate method
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Дата
2025
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Хмельницький національний університет
Анотація
The article investigates the influence of technological modes of separate carbonitriding of carbon steels on
the thickness and microhardness of the hardened layer. Two hardening variants were investigated: first, carburizing
of surfaces was carried out in argon-propane, and then nitriding in argon-nitrogen mixtures and vice versa. As the
conducted studies have shown, the variant of the hardening technological process significantly affects the physical
and mechanical characteristics of the hardened layer. In all two variants of the technological process, the hardened
layer consists of a surface carbonitride zone and a diffusion zone of internal nitriding, but the properties of these
zones are different in different variants of the technological process. Thus, when hardening steels according to the
first mode, the thickness of the carbonitride zone is maximum, and the internal nitriding zone has a small thickness.
This is explained by the fact that the carbonitride layer created on the steel surface at the first stage of processing
performs the function of shielding the surface from the penetration of nitrogen ions into the surface layer of the
metal. When hardening according to the second mode, the carbonitride zone has a slightly smaller thickness, but
a more developed internal nitriding zone. In addition, carbonitriding according to the first mode leads to the
formation of carbonitride inclusions in the diffusion zone in the form of a mesh, which significantly reduce the
plasticity of the layer and under dynamic loads are centers of microcrack nucleation. It has also been established
that a carbonitride ε − phase is formed on the surface of steels, which consists of carbonitrides of the type Fe2(N,C),
Fe3(N,C), Fe4(N,C). The carbonitride zone has high hardness, high corrosion resistance, and increased wear
resistance. The thickness of the carbonitride zone reaches a thickness of up to 25 microns. Under the carbonitride
zone is the internal nitriding zone, which has a large thickness and is the main part of the carbonitrided layer. The
internal nitriding zone consists of a nitrogenous solid solution of the base metal, its nitrides and nitrides of alloying
elements. The dependences of thickness and microhardness on the technological parameters of carbonitriding of
carbon steels obtained in the work: temperature, saturation time, composition of the gas medium, its pressure allow
them to be optimized depending on the requirements of further operation
Опис
Ключові слова
carbon steels, wear resistance, carbonitration, medium pressure, thickness of the hardening layer
Бібліографічний опис
Wear resistance of structural steels carbonitrated by the separate method / M. S. Stechyshyn, O. V. Dykha, D. V. Zdorenko, E. G. Oleksandrenko // Problems of Tribology. – 2025. – Vol. 30, No 1/115. – Р. 38-44.