Abrasive wear behavior of austempered ductile iron with niobium additions

Pimentel, Amanda Souza Oliveira; Guesser, Wilson Luiz; Silva, William José Rodrigues Custódio da; Portella, Pedro Dolabella; Woydt, Mathias; Burbank, John

doi:10.1016/j.wear.2019.203065

Cited by 14 publications

(5 citation statements)

References 6 publications

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“…Table 2 describes the parameters indicated by the ASTM G65 standard and the adapted parameters used in this work. An adaptation of condition A (A′) was chosen because it simulates a more aggressive media of abrasive wear, a situation more suitable for materials with medium to high resistance to abrasion, according to the literature [20,21].…”

Section: Methodsmentioning

confidence: 99%

Impact of incorporating FeNbC into weld flux on the abrasive wear resistance of coatings produced by SAW in a microalloyed steel

Pollnow,

Cardoso,

das Neves

et al. 2024

Surf. Topogr.: Metrol. Prop.

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Owing to the global shortage of raw materials and an increase in their prices, there is a growing demand for engineering solutions to increase the lifespan and durability of equipment and components. Therefore, this study aims to combine surface engineering and welding engineering to produce a niobium-rich coating using submerged arc welding (SAW) deposition. SAW is a cost-effective technique that allows high deposition rates and technical simplicity, which can enhance mechanical properties and resistance to abrasive wear of components. This research involves the addition of a FeNbC powder alloy in percentages of 5, 10, and 15 wt.% to a neutral commercial SAW flux, as an alternative to adding Nb to the microstructure of the deposited coating. The coating was characterized by optical microscopy to analyze the microstructure, such as the presence of phases; microhardness through a Vickers micro-durometer, and resistance to abrasive wear through the loss of mass using a rubber wheel-type abrasometer. The wear mechanisms were evaluated using scanning electron microscopy. The results showed that a Nb-rich coating can be deposited via SAW, and the coatings successfully increased microhardness by up to 110% and resistance to abrasive wear to values higher than the base metal used (microalloyed steel). The microstructure formed was rich in Fe2Nb and NbC, proving the formation of Nb-rich phases. Additionally, the mechanism of abrasive wear was predominantly plastic for the base metal and changed to micro-cutting and micro-plowing after the addition of up to 15% of FeNbC.

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Section: Methodsmentioning

confidence: 99%

Impact of incorporating FeNbC into weld flux on the abrasive wear resistance of coatings produced by SAW in a microalloyed steel

Pollnow,

Cardoso,

das Neves

et al. 2024

Surf. Topogr.: Metrol. Prop.

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“…For all HSDI samples with different Nb content, a change in the phase fraction in the metallic matrix was observed, as well as the presence of small irregular particles randomly distributed and corresponding to polygonal primary NbC carbides. These particles form before the casting due to the high affinity between Nb and C atoms, so they are called primary carbides [18,21,22,[24][25][26][27][28][29][30][31]. Unlike other carbide-forming elements (Mo, Cr, and V), precipitation of NbC carbides occurs randomly throughout the material rather than by positive segregation.…”

Section: Microstructural Analysismentioning

confidence: 99%

“…The formation of NbC carbides and the effect of finer pearlite in the microstructure have been attributed to such increases. In some studies, Nb addition was found to increase cast iron hardness due to the refinement of pearlitic interlamellar spacing, austenitic grain size, and the presence of NbC carbides [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Valdez

Navarro

Valdés

et al. 2023

Metals

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In this study, the effects of Nb on the microstructural characteristics, hardness, and corrosion resistance of high-silicon ductile cast iron (HSDI)-3.6 wt.% Si were investigated. Samples from different castings with 0–0.9 wt.% Nb were obtained and compared to a commercial ductile iron. Microstructures showed that the amount of ferrite in the matrix increased with increasing Nb content, from 34% for unalloyed HSDI to 88% for HSDI-0.9 wt.% Nb. The presence of randomly distributed NbC carbides was identified by EDX for all the samples alloyed with Nb, and the hardness of the HSDI increased with the Nb content. To evaluate the influence of the Nb content on the corrosion resistance of HSDI, potentiodynamic tests were carried out in a solution of H2SO4. The highest corrosion rate on HSDI was obtained for the HSDI-0.3 wt.% Nb sample, with 2802 mills per year, due to the amount of pearlite present and the lowest presence of NbC carbides, compared to the HSDI-0.9 wt.% Nb, with 986 mills per year. This behavior was attributed to the ferrite matrix obtained because of a high Si content in the DI, which delayed the anodic dissolution of the alloy and suppressed the pearlitizing effect of Nb for contents greater than 0.3 wt.%, as well as to the effect of NbC carbides, which acted as inhibitors.

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“…Ductile iron is used in structural parts such as hubs, gears and crankshafts, which require not only high mechanical properties, but also high wear resistance [1][2][3][4]. Austempered ductile iron can generally meet the above requirements, but its preparation process is relatively complex, requiring complex alloying and strict heat treatment process on the basis of casting [5][6][7]. Therefore, it is necessary to develop a simpler preparation process for wear-resistant ductile iron.…”

Section: Introductionmentioning

confidence: 99%

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

Williams²,

Qu³

et al. 2023

Tribol Lett

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In order to improve the wear resistance of ductile iron, different contents of TiC particles are added into ductile iron used lost foam casting and the tribological behavior of ductile iron is studied through a ballon-disk sliding test. It is found that with the increase of TiC content, the pearlite content gradually increases, which is attributed to TiC accelerating the diffusion of carbon atoms to cementite and promoting the heterogeneous nucleation of cementite. The increase of pearlite content and the second phase strengthening caused by TiC improve the hardness and tensile strength of ductile iron. Ductile iron has the best tensile strength (498 MPa) and hardness (168 HV1) with a TiC content of 1 wt.%. The wear resistance also increases with increasing TiC content. The wear volume is reduced from 0.14 mm 3 to 0.03 mm 3 , and the main wear mechanism changes from adhesive wear to abrasive wear. The oxide layer produced by frictional heat on the worn surface and the hardened layer produced by strain hardening on the subsurface further improve the wear resistance. Therefore, the wear resistance of ductile iron is affected by the changes of microstructure before and after wear.

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Abrasive wear behavior of austempered ductile iron with niobium additions

Cited by 14 publications

References 6 publications

Impact of incorporating FeNbC into weld flux on the abrasive wear resistance of coatings produced by SAW in a microalloyed steel

Impact of incorporating FeNbC into weld flux on the abrasive wear resistance of coatings produced by SAW in a microalloyed steel

Determination of Corrosion Resistance of High-Silicon Ductile Iron Alloyed with Nb

Effect of TiC Particles Addition on Tribological Behavior of Ductile Iron

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