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

Ефременко, В. Г.; Chabak, Yu. G.; Shimizu, Kazumichi; Golinskyi, Michail A.; Lekatou, A.; Petryshynets, Ivan; Efremenko, B.V.; Halfa, Hossam; Kusumoto, Kenta; Zurnadzhy, V. І.

doi:10.1016/j.matchar.2023.112691

Cited by 8 publications

(20 citation statements)

References 49 publications

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“…Many of these inclusions have an axial hole filled with the matrix phase ( Figure 2 b). Their chemical composition is close to that of the aforementioned eutectic fibres [ 51 , 52 ]. The space between the prismatoids is still filled with the “Chinese-script” eutectic colonies, although they became very sparse when the amount of fibres decreases (the width of the matrix inter-layers increases accordingly).…”

Section: Resultsmentioning

confidence: 70%

“…The eutectic colonies are bunches of fibres branched in all directions within the metallic matrix (ferrite). The fibres were characterised in earlier works [ 51 , 52 ] as borocarbide M 2 (B,C) 5 containing W (12–30 wt.%), Mo (14–19 wt.%), V (15–18 wt.%), Cr (10–21 wt.%), and Ti (1–5 wt.%) (the exact content of each element depends on C and B concentrations in alloy). Due to enrichment with elements of a higher Z number (W and Mo), the fibres have a light BSE contrast that differs from the dark BSE contrast of a matrix enriched with the elements of a lower Z number (Fe, Cr, Mn, and Si).…”

Section: Resultsmentioning

confidence: 99%

“…This type has a “rosette”-like pattern characteristic of Cr 7 C 3 -based eutectics in high-Cr cast irons [ 48 ] ( Figure 1 c). The lamellae of the “rosette”-like eutectic differ from the primary inclusions due to their darker BSE contrast, indicating their enrichment in chromium (~31–45 wt.%) and iron (~30–40 wt.%) [ 51 , 52 ]. The colonies of the “rosette” eutectic are the plates (carboboride M 7 (C,B) 3 [ 51 ]) that radiate in tens microns through the matrix from the colony’s centre (shown in the longitudinal direction on the right side of Figure 2 c).…”

Section: Resultsmentioning

confidence: 99%

“…Five hardness measurements were performed on each of three different specimens (a total of 15 measurements for each alloy), with further averaging of the results. The data from the XRD/EDS study of the phase constituents of the alloys were adopted from [ 51 , 52 ].…”

Section: Methodsmentioning

confidence: 99%

“…This concept differs from the high-B multi-component Fe-B-C-Cr-Mo-Al-Si-V-Mn-Ti alloys studied in [ 49 , 50 ] in that it involves a higher carbon content and different key elements (W, V, Cr, and Ti). The structure characterisation and thermodynamic analysis of “hybrid” MCCIs with variable carbon (0.3–1.1 wt.%) and boron (1.5–3.5 wt.%) contents are described in detail in [ 51 , 52 , 53 ]. These alloys are intended for wear applications, and therefore a comprehensive tribological assessment of these alloys under different wear conditions is strongly desired.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Microstructural Map and Phase Chemical Compositions in Hybrid Multi-component Cast Alloys Fe–W–Mo–V–Cr–Ti–(1.5–3.5 Wt Pct)B–(0.3–1.1 Wt Pct)C

Efremenko,

Chabak,

Lekatou

et al. 2024

Metall Mater Trans A

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Exploring the Solidification Sequence and Solid-State Transformations in High-Boron Multi-Component Cast Alloys by Differential Scanning Calorimetry

Chabak,

Golinskyi,

Podobova

et al. 2024

Inter Metalcast

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The newly designed multi-component (Fe–5 wt.% W–5 wt.% Mo–5 wt.% V–10 wt.% Cr–2.5 wt.% Ti) cast alloys, containing 0.7–1.1 wt.% C and 2.7–3.6 wt.% B, are intended for tribological applications. The present work was aimed at studying the solidification sequence and phase transformation temperature intervals of the above-mentioned alloys, in order to elucidate their structural status and further develop an appropriate heat treatment regime. For this purpose, Differential Scanning Calorimetry (DSC), microstructure observation and thermodynamic modeling were applied. Two temperature ranges of exothermic reaction (caused by the release of latent heat during transformation) were revealed at 1200-1091 °C and ≤400 °C. The first range was caused by the primary carboboride (M(C,B), M2(B,C)5) precipitation, followed by sequential eutectic reactions with the formation of carboborides M2(B,C)5, M7(C,B)3, and M3(C,B). The temperature ranges of eutectic transformations decreased with the increase in carbon and boron contents. Low-temperature exothermic reactions (at 399-181 °C) referred to the transformation of austenite into bainite or martensite. The values of the latent heat of the transformations were calculated and discussed. Graphical Abstract

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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)

Cited by 8 publications

References 49 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

Microstructural Map and Phase Chemical Compositions in Hybrid Multi-component Cast Alloys Fe–W–Mo–V–Cr–Ti–(1.5–3.5 Wt Pct)B–(0.3–1.1 Wt Pct)C

Exploring the Solidification Sequence and Solid-State Transformations in High-Boron Multi-Component Cast Alloys by Differential Scanning Calorimetry

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