Synergetic effect of niobium and molybdenum on abrasion resistance of high chromium cast irons

Penagos, J.J.; Pereira, J.I.; Machado, P.C.; Albertin, Eduardo; Sinatora, Amilton

doi:10.1016/j.wear.2017.01.103

Cited by 32 publications

(25 citation statements)

References 20 publications

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“…Note that the predicted and measured amounts of each phase are close, but a small difference was noticed since the real material does not solidify under equilibrium conditions as predicted by the software. The observed microstructure has been widely reported by several authors [12,[17][18][19][20][21][22][23] for niobium alloyed white irons. For these measurements, the matrix was considered to be fully austenitic; however, it is well known that some martensitic transformation follows the cooling down process after solidification.…”

Section: Methodssupporting

confidence: 78%

“…To get primary vanadium carbides, at least vanadium amounts of 5% are necessary, other way vanadium only reinforces the M 7 C 3 carbide [14][15][16]. In the case of niobium, most works studying the effect of this carbide-forming element are limited to amounts of less than 3% [11,12,[17][18][19][20][21][22][23] but up to 5% have been also produced along with high amounts of Mo and W [24]. Niobium forms primary carbides in the liquid and are later enclosed by austenite upon solidification; the size and distribution of which depends on the solidification rate (thickness of the casting).…”

Section: Introductionmentioning

confidence: 99%

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Niobium Additions to a 15%Cr–3%C White Iron and Its Effects on the Microstructure and on Abrasive Wear Behavior

Bedolla-Jacuinde

Guerra

Mejı́a

et al. 2019

Metals

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From the present study, niobium additions of 1.79% and 3.98% were added to a 15% Cr–3% C white iron, and their effects on the microstructure, hardness and abrasive wear were analyzed. The experimental irons were melted in an open induction furnace and cast into sand molds to obtain bars of 45 mm diameter. The alloys were characterized by optical and electron microscopy, and X-ray diffraction. Bulk hardness was measured in the as-cast conditions and after a destabilization heat treatment at 900 °C for 30 min. Abrasive wear resistance tests were undertaken for the different irons according to the ASTM G65 standard in both as-cast and heat-treated conditions under three loads (58, 75 and 93 N). The results show that niobium additions caused a decrease in the carbon content in the alloy and that some carbon is also consumed by forming niobium carbides at the beginning of the solidification process; thus decreasing the eutectic M7C3 carbide volume fraction (CVF) from 30% for the base iron to 24% for the iron with 3.98% Nb. However, the overall carbide content was constant at 30%; bulk hardness changed from 48 to 55 hardness Rockwell C (HRC) and the wear resistance was found to have an interesting behavior. At the lowest load, wear resistance for the base iron was 50% lower than that for the 3.98% Nb iron, which is attributed to the presence of hard NbC. However, at the highest load, the wear behavior was quite similar for all the irons, and it was attributed to a severe carbide cracking phenomenon, particularly in the as-cast alloys. After the destabilization heat treatment, the wear resistance was higher for the 3.98% Nb iron at any load; however, at the highest load, not much difference in wear resistance was observed. Such a behavior is discussed in terms of the carbide volume fraction (CVF), the amount of niobium carbides, the amount of martensite/austenite in matrix and the amount of secondary carbides precipitated during the destabilization heat treatment.

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Section: Methodssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Niobium Additions to a 15%Cr–3%C White Iron and Its Effects on the Microstructure and on Abrasive Wear Behavior

Bedolla-Jacuinde

Guerra

Mejı́a

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…The HCCI outstanding abrasion resistance results from the morphology, distribution and amount of a hard phase (carbides) embedded in a matrix, which is predominantly martensitic or austenitic. [1][2][3] Many studies have been done in order to improve HCCI abrasion resistance. Some works have demonstrated that the addition of carbide-forming elements, such as niobium, enhance wear resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8] These characteristics have positive potential effects on wear resistance. Low concentrations of Nb (less than 1%) has been studied 2,4,6,9) and it has indicated the beneficial effects of niobium on the resistance matter.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment Effect on the Microstructure and Tribological Behaviour of a High Chromium Cast Iron with 0.5% of Niobium

et al. 2020

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“…7) Titanium and niobium were used to improve the wear resistance by forming the harder carbides. [8][9][10] Different from the titanium and niobium, silicon was rejected from forming carbides and mostly dissolved in the matrix. In the medium and high carbon high strength steel by applying quenching-portioning -tempering treatment (QPT), the addition of Si with high content (1.5-2.0 wt.%) was used to suppress the precipitation of cementites during portioning process and enhance the carbon partitioning from martens-…”

Section: Introductionmentioning

confidence: 99%

Effect of Si Content on the Microstructure and Wear Resistance of High Chromium Cast Iron

et al. 2018

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Synergetic effect of niobium and molybdenum on abrasion resistance of high chromium cast irons

Cited by 32 publications

References 20 publications

Niobium Additions to a 15%Cr–3%C White Iron and Its Effects on the Microstructure and on Abrasive Wear Behavior

Niobium Additions to a 15%Cr–3%C White Iron and Its Effects on the Microstructure and on Abrasive Wear Behavior

Heat Treatment Effect on the Microstructure and Tribological Behaviour of a High Chromium Cast Iron with 0.5% of Niobium

Effect of Si Content on the Microstructure and Wear Resistance of High Chromium Cast Iron

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