Liquidus Surface Projection of the Fe-Nb-C System in the Iron-Rich Corner

Haddad, Fadila; Amara, Sif Eddine; Kesri, R.

doi:10.1007/s11661-008-9483-8

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…Therefore, we shall hereinafter refer to this region as the transition region. NbC with a morphology resembling a eutectic phase, commonly referred to in the literature as Chinese-script [13,[27][28][29], can also be observed here. Finally, the rest of the casting (Figures 2fh), constitutes the bulk material, where Chinese-script NbC is predominantly observed and primary NbC particles are rare.…”

Section: Nbc Particle Distributionmentioning

confidence: 57%

“…While this resembles a eutectic reaction, the wide temperature range means that it could be argued that it would be more accurate to refer to it as a "pseudo-eutectic" reaction [16]. However, to be consistent with the established literature, we shall still refer to it as a eutectic reaction [13,[27][28][29]. As the casting cools through this eutectic temperature range (approximately 1290 -1280 o C), the eutectic M7C3 and austenite phase also form.…”

Section: General Microstructurementioning

confidence: 81%

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Microstructure characterisation and mechanical properties of a functionally-graded NbC/high chromium white cast iron composite

Kan

Albino

Dias-da-Costa

et al. 2018

Materials Characterization

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A functionally graded NbChigh chromium white cast iron composite was successfully fabricated by centrifugal casting for high wear applications. The migration of primary NbC particles to the outer periphery, as predicted by Stokes' law, resulted in an extremely hard outer layer at the surface of a softer bulk material. Microstructural characterisation showed that both the volume fraction and the morphology of the carbides varies along the thickness of the specimen. At the outer surface, the NbC was present as primary carbides while Chinese-script NbC was found in the bulk of the material. Hardness, sliding wear and three-point bending tests confirmed that the outer layer was harder and more wear resistant than the rest of the material, which was correspondingly tougher. The study of the fracture surface of the specimens showed that there is a strong bond between NbC and the matrix such that delamination between the reinforcements and the matrix did not occur during fracture. If Chinese-script NbC can be reduced or prevented in the bulk material, further improvements to toughness could be achieved.

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Section: Nbc Particle Distributionmentioning

confidence: 57%

Section: General Microstructurementioning

confidence: 81%

Microstructure characterisation and mechanical properties of a functionally-graded NbC/high chromium white cast iron composite

Kan

Albino

Dias-da-Costa

et al. 2018

Materials Characterization

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“…In contrast, layer III mainly contained nodular NbC. Niobium carbide with "chinese-script" morphology, reported in works [31,32], was not identified.…”

Section: Chemical Elements Distributionmentioning

confidence: 71%

The Influence of Microstructure on Abrasive Wear Micro-Mechanisms of the Claddings Produced by Welding Used in Agricultural Soil

et al. 2020

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Claddings produced by welding are commonly used to increase the durability of the working elements of agricultural tools. The working conditions that occur during the cultivation of agricultural soil determine the wear intensity (different soil fractions, biological, and chemical environment). It was found that the tested claddings (Fe-Cr-C-Nb system) is characterized by three different layers: hypereutectic (layer I), near eutectic (layer II), and hypoeutectic (layer III). In layer I, micro-cracking and spalling of hard and brittle primary M7C3 carbides resulted in micro-delamination under the impact of larger soil fractions, which increased the wear intensity. Due to the lower fraction of primary M7C3 carbides in layer II, the share of micro-delamination was less significant in comparison to layer I. It was found that niobium carbides are firmly embedded in the matrix and effectively inhibit wear intensity in layer I and layer II. Layer III contained austenite dendrites, a refined eutectic mixture, and also NbC. In this layer, cracks (caused the unfavorable eutectic mixture morphology) were found in the interdendritic spaces at the worn surface. After the penetration of the cladding, there was a "wash-out effect", which resulted in a significant reduction in the durability of the working elements due to abrasive wear.

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“…The Grain Size And Casting Structure. Titanium nitride was effective nucleus substrate to ferrite phase [17], so the quantity and distribution of these inclusions were directly influenced nucleation of the ferrite grain. The content of titanium and nitrogen was similar in three ingots, but Table 3 and Fig.…”

Section: Discussionmentioning

confidence: 99%

“…From the literatures [3,14,17,18], the niobium carbide did not form during solidification processing. But in this research, the niobium carbide had formed during the solidification, seeing Fig.…”

Section: Discussionmentioning

confidence: 99%

Titanium Nitride and Niobium Carbide in the Ferritic Stainless Steel and the Influence to Casting Macrostructure

Xia

Shang

et al. 2019

MSF

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Titanium and niobium were applied to stable the carbon or nitrogen which dissolved ferritic stainless steel for improving the anti-corrosion performance. The titanium nitride and niobium carbide had been formed during solidification processing. For understanding those precipitates how to influence the casting macrostructure, three steels that had different content of niobium and the fixed content of titanium had been designed. The result showed the casting macrostructure of ingot and the grain size of the centre-equiaxed crystal zones had different tendency. And the titanium nitride and niobium carbide had interacted.

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Liquidus Surface Projection of the Fe-Nb-C System in the Iron-Rich Corner

Cited by 11 publications

References 10 publications

Microstructure characterisation and mechanical properties of a functionally-graded NbC/high chromium white cast iron composite

Microstructure characterisation and mechanical properties of a functionally-graded NbC/high chromium white cast iron composite

The Influence of Microstructure on Abrasive Wear Micro-Mechanisms of the Claddings Produced by Welding Used in Agricultural Soil

Titanium Nitride and Niobium Carbide in the Ferritic Stainless Steel and the Influence to Casting Macrostructure

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