Thermodynamics of the oxygen solutions in chromium-containing melts of the Fe-Co system

Александров, А. А.; Dashevskii, V. Ya.; Linchevskii, B. V.

doi:10.1134/s003602951409002x

Cited by 7 publications

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“…В расплавах системы Fe - Co - Cr при содержании хрома выше 2,0 - 2,5 % (в зависимости от содержания кобальта) продуктом реакции взаимодействия хрома с кислородом, содержащимся в расплаве, является оксид Cr 2 O 3 [6] (1)…”

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“…Значения конс тант равновесия реакции раскисления хромом и кремнием железокобальтовых сплавов, содержащих 10 и 20 % Co, а также значения параметров взаимодействия, характеризующие растворы кислорода в этих расплавах, приведены в таблице. Данные для сплавов Fe - 10 % Co и Fe - 20 % Co рассчитаны по методике, описанной в работах [6,9]. В расплавах Fe - 10 % Co и Fe - 20 % Co при 1873 К растворимость кислорода составляет 0,21 и 0,19 % соответственно [11].…”

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THERMODYNAMICS OF OXYGEN SOLUTIONS IN SILICON-CONTAINING Fe – Co – Cr MELTS

Александров

Дашевский

Леонтьев

2018

Izv. vysš. učebn. zaved., Čern. metall.

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Thermodynamic analysis of the effect of silicon on the solubility of oxygen in Fe – Co – Cr melts has been carried out at 1873 K. Silicon has a sufficiently high deoxidizing ability in Fe – Co – Cr melts. Silicon at low contents practically does not affect the concentration of oxygen in the melt, which is determined by the chromium content. With a higher content of silicon after changing the mechanism of interaction process of chromium and silicon with oxygen, when silicon already determines the solubility of oxygen in the melt, the oxygen concentration decreases.

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THERMODYNAMICS OF OXYGEN SOLUTIONS IN SILICON-CONTAINING Fe – Co – Cr MELTS

Александров

Дашевский

Леонтьев

2018

Izv. vysš. učebn. zaved., Čern. metall.

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Investigating the Effects of CoMoCrSi Powder Composition and Particle Size, and Annealing Heat Treatment on Microstructure and Mechanical and Tribological Performance of HVOF Sprayed Coatings

Ertürk,

Tirkeş,

Gür

2024

Met. Mater. Int.

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An investigation was conducted to analyze the mechanical properties, wear behavior, and microstructure of coatings formed by high-velocity oxygen fuel spraying of CoMoCrSi powders. The effects of varying Cr concentration and particle sizes before and after heat treatment at 900 °C for 4 h were studied comparatively. The increase in Cr and Mo elements in the expanse of Co increased the structure's hardness before and after the heat treatment. As this increase was 10% in as-sprayed conditions, annealing raised the increase to 30%. Splat boundaries were the most vulnerable constituents against forces, creating a significant disadvantage in terms of structural integrity and affecting the overall performance. After annealing, the boundary strengths experienced a remarkable four-fold increase and cracks and fractures reduced significantly. The susceptibility of splat boundaries had a detrimental effect on room temperature wear behavior, and increased boundary densities led to a marked reduction in wear performance. Heat treatment induced improvements significantly increased the room temperature wear performance. At elevated temperature, the formation of oxide layers composed of CoMoO4, Co3O4, MoO3, and Cr2O3 overcame the weaknesses of the as-sprayed coating, reducing both the friction coefficient and wear losses. A reduced Co ratio led to the formation of an oxide blend with a higher concentration of Mo and Cr oxides on the surface, further improving the coating's wear behavior. Graphical Abstract

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