Producing Multilayer Coatings from the Gas Phase with the Participation of TiC and TiN Compounds on the Hard Alloy VK8

Khyzhnyak, V. G.; Loskutova, T. V.; Kalashnikov, T. Yu.; Mykolaychuk, O. I.

doi:10.3103/s1063457618030036

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The same interpretation of the effect of boron on the WR value is applicable for the alloys containing 0.7–1.1 wt.% C. The only distinction is that the differences in the WR values between 2.5 wt.% B (maximum) and 1.5 wt.% B (minimum) are much lower than those of the alloys with 0.3 wt.% C. This observation points to the importance of carbon for high-B multi-component alloys: carbon successively improves their wear response at any boron content. The most plausible reasons for this are (a) an increase in the amount of hard Ti-rich carboboride (M(C,B)) [ 52 , 64 ]; (b) an increase in the total amount of eutectic (Cr/Fe)-rich carboborides, which effectively protect the matrix areas between the colonies of “Chinese-script” eutectic and primary prismatoids; and (c) the alteration of the matrix structure from soft ferrite (at 0.3 wt.% C) to harder “ferrite + pearlite” or martensite (at 0.7–1.1 wt.% C). The hardness and wear resistance of the matrix are important in the context of hindering the carboboride breakage after the wear-off of the surrounding matrix.…”

Section: Discussionmentioning

confidence: 99%

Investigations of Abrasive Wear Behaviour of Hybrid High-Boron Multi-Component Alloys: Effect of Boron and Carbon Contents by the Factorial Design Method

et al. 2023

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This paper is devoted to the evaluation of the “three-body-abrasion” wear behaviour of (wt.%) 5W–5Mo–5V–10Cr-2.5Ti-Fe (balance) multi-component (C + B)-added alloys in the as-cast condition. The carbon (0.3 wt.%, 0.7 wt.%, 1.1 wt.%) and boron (1.5 wt.%, 2.5 wt.%, 3.5 wt.%) contents were selected using a full factorial (32) design method. The alloys had a near-eutectic (at 1.5 wt.% B) or hyper-eutectic (at 2.5–3.5 wt.% B) structure. The structural micro-constituents were (in different combinations): (a) (W, Mo, and V)-rich borocarbide M2(B,C)5 as the coarse primary prismatoids or as the fibres of a “Chinese-script” eutectic, (b) Ti-rich carboboride M(C,B) with a dispersed equiaxed shape, (c) Cr-rich carboboride M7(C,B)3 as the plates of a “rosette”-like eutectic, and (d) Fe-rich boroncementite (M3(C,B)) as the plates of “coarse-net” and ledeburite eutectics. The metallic matrix was ferrite (at 0.3–1.1 wt.% C and 1.5 wt.% B) and “ferrite + pearlite” or martensite (at 0.7–1.1 wt.% C and 2.5–3.5 wt.% B). The bulk hardness varied from 29 HRC (0.3 wt.% C–1.5 wt.% B) to 53.5 HRC (1.1 wt.% C–3.5 wt.% B). The wear test results were mathematically processed and the regression equation of the wear rate as a function of the carbon and boron contents was derived and analysed. At any carbon content, the lowest wear rate was attributed to the alloy with 1.5 wt.% B. Adding 2.5 wt.% B led to an increase in the wear rate because of the appearance of coarse primary borocarbides (M2(B,C)5), which were prone to chipping and spalling-off under abrasion. At a higher boron content (3.5 wt.%), the wear rate decreased due to the increase in the volume fraction of the eutectic carboborides. The optimal chemical composition was found to be 1.1 wt.% C–1.5 wt.% B with a near-eutectic structure with about 35 vol.% of hard inclusions (M2(B,C)5, M(C,B), M3(C,B), and M7(C,B)3) in total. The effect of carbon and boron on the abrasive behaviour of the multi-component cast alloys with respect to the alloys’ structure is discussed, and the mechanism of wear for these alloys is proposed.

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Section: Discussionmentioning

confidence: 99%

Investigations of Abrasive Wear Behaviour of Hybrid High-Boron Multi-Component Alloys: Effect of Boron and Carbon Contents by the Factorial Design Method

et al. 2023

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“…The possibility of increasing the corrosion resistance of steel 20 with chromosilicid coatings by introducing oxidizing inorganic additives (molybdates, chromates, permanganates) into aggressive solutions has been established [3,[12][13][14]. It is shown that the introduction of 3 g/l of sodium molybdate into 10 % solutions of phosphoric, hydrochloric, and sulfuric acids increases the corrosion resistance of chromosilicide coatings by 4.0; 6.0; 34.0 times, respectively, and provides a degree of protection against corrosion at the level of 75.0 -96.2 %.…”

Section: -3mentioning

confidence: 99%

Structure and Protective Properties of Complex Chromosilicide Diffusion Coatings on Steel 20

Pohrebova,

Yantsevych,

Loskutova

et al. 2023

J. Nano- Electron. Phys.

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The paper presents the results of studies of the structure, chemical composition, microhardness, heat, and corrosion resistance of multicomponent coatings obtained during diffusion chromosiliconizing of steel 20. The coating was applied in a specially designed reaction chamber at a temperature of 1050 ºС for 6 hours to the surface of carbon steel 20 in a closed reaction space at a reduced pressure of the active gas phase, for the formation of which rational amounts of silicon and chromium were used, as well as carbon tetrachloride as an activator. It was established that the obtained coatings consist of carbides of chromium Cr23C6, Cr7C3 doped with silicon and a zone of solid solution of chromium and silicon in iron. The maximum amount of silicon is observed in the inner area of the coating (2.82 -3.89 wt. %) at a depth of 15-50 microns. The total thickness of the coating is 110 μm, and the microhardness of the surface layers is 19.5 GPa. The surface layers of coatings, based on chromium and silicon, lead to the formation of protective films Cr2O3, Al2O3, which ensures their high heat resistance in the air atmosphere and corrosion resistance in oxidizing acids. The possibility of increasing the corrosion resistance of coatings by introducing inorganic oxidants into aggressive solutions has been established.

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The novel hybrid concept on designing advanced multi-component cast irons: Effect of boron and titanium (Thermodynamic modelling, microstructure and mechanical property evaluation)

Ефременко

Chabak

Shimizu

et al. 2023

Materials Characterization

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Producing Multilayer Coatings from the Gas Phase with the Participation of TiC and TiN Compounds on the Hard Alloy VK8

Cited by 4 publications

References 5 publications

Investigations of Abrasive Wear Behaviour of Hybrid High-Boron Multi-Component Alloys: Effect of Boron and Carbon Contents by the Factorial Design Method

Investigations of Abrasive Wear Behaviour of Hybrid High-Boron Multi-Component Alloys: Effect of Boron and Carbon Contents by the Factorial Design Method

Structure and Protective Properties of Complex Chromosilicide Diffusion Coatings on Steel 20

The novel hybrid concept on designing advanced multi-component cast irons: Effect of boron and titanium (Thermodynamic modelling, microstructure and mechanical property evaluation)

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