Properties of Oxynitride Coatings on Steel Obtained by Three-Stage Nitriding Processes With Oxidation

Boynazarov, Urol; Петрова, Л. Г.; Brezhnev, A. A.; Bibikov, P.S.

doi:10.52351/00260827_2021_08_64

Cited by 2 publications

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“…A break occurs on the distribution curve of the nitrogen concentration in the ε-phase region at a distance of 6 μm from the surface (which, as can be seen from the oxygen distribution, corresponds to the former boundary of the oxide film). This break is explained by different diffusion coefficients in the ε -phase on different sides of the break point [1,2,3]. An increase in the diffusion coefficient of nitrogen in the ε-phase in the region where an oxide film existed earlier leads to the effect of an increase in the depth of the nitride layer during nitriding of a sample that has undergone preliminary oxidation compared to a sample that has undergone nitriding without preliminary oxidation [3].…”

Section: Methodsmentioning

confidence: 99%

“…However, obtaining such a protective diffusion coating by the existing nitriding process, such as nitriding and subsequent vapor oxidation, requires more time and a lot of energy costs. Nitriding with preliminary and subsequent vapor oxidation in optimal modes can significantly reduce the production time with good diffusion protective coatings properties and save energy [1][2][3]. MRT…”

Section: Introductionmentioning

confidence: 99%

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Formation of diffusion nitride-oxide coatings

Boynazarov

2023

E3S Web of Conf.

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It is known that nitro-oxide coatings were developed based on nitriding, which are obtained using a two-stage technology consisting of nitriding at the first stage of the process and vaporization at the second stage. Such processing provides high physical and mathematical characteristics of hardened parts. This technological process was improved by us due to preliminary oxidation, which made it possible to accelerate the production of nitride-oxide with the necessary physical and mechanical properties. This work makes a theoretical calculation of the oxidation processes and subsequent nitriding of steels and a comparison with experimental data on the example of 38X2MYA. The article presents an analysis of the formation of oxynitride diffusion protective layers obtained by a three-stage nitriding method at a temperature of 580° C, which consists of preliminary oxidation, nitriding, and subsequent steam oxidation. The article also describes the effect of the oxide film on the nitriding process during preliminary oxidation and nitriding under short-term conditions at a temperature of 580 S.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of diffusion nitride-oxide coatings

Boynazarov

2023

E3S Web of Conf.

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METHODOLOGICAL FOUNDATIONS OF THE MATERIALS SCIENCE ASSESSMENT OF THE QUALITY OF LUBRICANTS FOR LOADED INTEGRATIONS OF MACHINES AND MECHANISMS. Message 2. The influence of the composition of lubricants on the structural and phase state of the deformation zone of metal tribounits and their antifriction properties

Kuksenova,

Savenko

2024

Science Intensive Technologies in Mechanical Engineering

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The relevance of the research is determined by the needs of mechanical engineering in the development of inexpensive and effective technologies for surface hardening of steel products, which include gas nitride hardening. The aim of the work is to study the effect of nitride hardening in the gas-cyclic regime on the kinetics of growth of diffuse layers and their phase composition in case of iron and steel: ChWMn tool steel and corrosion-resistant maraging steel 03Ch11Ni10Mo2Ti (WSTST17). In addition to isothermal processes (at 520 ℃ and 620 ℃), processes with temperature changes at active and passive stages (thermal cycling 520 ℃ / 620 ℃) have been studied. It has been found that gas and thermal cycling significantly increases the thickness of the diffusion layer in iron compared to traditional nitride hardening in ammonia, and this is mainly due to the growth of the internal nitriding zone. Processes with multitime repeat short half-cycles, which end in an active saturation stage in ammonia and contribute to the formation of a developed nitride zone. The formation of surface layers in iron without an ε -phase occurs in two-stage processes with a final passive stage. It is shown that thermo-gas cyclic processes provide a multiple increase in the thickness of the internal nitriding zone in ChWMn steel. Processes with a duration of half cycles of 1 and 1,5 hours with the final stage of denitration contribute to the predominance of the γ' phase in the carbonitride zone, which explains the increase in wear resistance. A thermal gascyclic process of 530 ℃ / 580 ℃ in a pulsating ammonia-air mixture with a final passive stage is used to form a junction zone based on the γ'- phase in steel 03Ch11Ni10Mo2Ti (WSTST17).

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Properties of Oxynitride Coatings on Steel Obtained by Three-Stage Nitriding Processes With Oxidation

Cited by 2 publications

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Formation of diffusion nitride-oxide coatings

Formation of diffusion nitride-oxide coatings

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