Preparation of in situ NbC–TiC@Graphene/Fe composite inoculant and its effect on microstructures and properties of GCr15

Traditional cast W18Cr4V high-speed steel (HSS) undergoes elemental segregation during solidification, which deteriorates its macroscopic mechanical properties. Previous reports have demonstrated that grain refinement overcomes this issue. Therefore, herein, the effect of an Fe-based nanocomposite inoculant on carbide dispersion is investigated. The inoculant comprises graphene-coated ceramic particles prepared in situ via mechanical grinding in a ball grinder, where material thermodynamics are considered. The microstructure of the inoculated W18Cr4V HSS is analyzed using transition electron microscopy, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The orientation relationship among the phases is ð200Þ NbC = = ð11 1Þ Fe 3 W 3 C = = ð002Þ Fe 3 C . The nanocomposite ceramic particles serve as a base for the heterogeneous nucleation of Fe 3 W 3 C and Fe 3 C, thereby increasing the nonuniform nucleation rate for enhanced grain refinement. This behavior plays a crucial role in the intragranular reinforcement of HSS.

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“…These findings were indicative of the following coplanar structure. [19,20] ð200Þ NbC ==ð11 1Þ Fe 3 W 3 C ==ð002Þ Fe 3 C…”

Section: Resultsmentioning

confidence: 99%

Enhanced Grain Refinement of W18Cr4V High‐Speed Steel Using in Situ TiN−Nb−Cr@Graphene/Fe Nanocomposite Inoculant

Bai

Cui

Zhang

et al. 2021

steel research int.

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“…Rolling bearings occupy an important position in machinery industry, in which GCr15 steel is one of the main steel grades due to its distinguished wear resistance. However, GCr15 steel still cannot meet the high requirements of wear resistance in the field of bearings [1], which is particularly needed to improve its hardness and lubrication performance [2,3]. Previous researches have indicated that the coating technology may effectively increase the surface performance and extend the service life of bearings [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

Zhu

Dejun

2021

Materials Science-Poland

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NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings were prepared on GCr15 steel by laser cladding (LC). The microstructure and the phases of the obtained coatings were analyzed using ultra-depth-of-field microscopy (UDFM) and X-ray diffraction (XRD), respectively. A ball-on-disk wear test was used to analyze the friction-wear performance of the substrate and the NiMo-TiC coatings under grease-lubrication condition. The results show that the grain shape of NiMo-TiC coatings is dendritic. The wear resistance of NiMo-TiC coatings is improved by the addition of TiC, and the depths of the worn tracks on the substrate and on the NiMo-5%TiC, NiMo-15%TiC, and NiMo-25%TiC coatings are 4.183 μm, 2.164 μm, 1.882 μm, and 1.246 μm, respectively, and the corresponding wear rates are 72.25 μm3/s/N, 32.00 μm3/s/N, 18.10 μm3/s/N, and 7.99 μm3/s/N, respectively; this shows that the NiMo-25%TiC coating has the highest wear resistance among the three kinds of coatings. The wear mechanism of NiMo-TiC coatings is abrasive wear, and the addition of TiC plays a role in resisting wear during the friction process.

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“…Niobium carbide (NbC) has a high melting point (3600°C), high hardness (19.6 GPa), excellent wear resistance, superior oxidation resistance, and outstanding thermal stability [1][2][3][4]. These enticing properties make it widely used in extreme high-temperature environments, such as high-performance missile nozzles and aerospace propulsion systems [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Morphological evolution of NbC particles at the interface of niobium–iron diffusion couple

Bai

Zhong

Wei

et al. 2020

Materials Science and Technology

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To investigate the morphological evolution of the NbC phase, a niobium-cast iron diffusion couple was designed and fabricated. The two-dimensional (2D) and three-dimensional (3D) growth morphology of NbC particles were analysed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The morphological evolution mechanism of NbC particles was also discussed. The results reveal that from the interface of the Nb wire/NbC-Fe diffusion layer to the cast iron, as the thickness of the NbC-Fe diffusion layer increases, the morphology of NbC particles changed from the nearly spherical to truncated cube, then to a perfect cube. The evolution of particle morphology is mainly attributed to the change in the C/Nb ratio and the existence of Fe atoms affecting the relative growth rates of the {111} and {100} facets on a NbC crystal.

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Preparation of in situ NbC–TiC@Graphene/Fe composite inoculant and its effect on microstructures and properties of GCr15

Cited by 8 publications

References 35 publications

Enhanced Grain Refinement of W18Cr4V High‐Speed Steel Using in Situ TiN−Nb−Cr@Graphene/Fe Nanocomposite Inoculant

Enhanced Grain Refinement of W18Cr4V High‐Speed Steel Using in Situ TiN−Nb−Cr@Graphene/Fe Nanocomposite Inoculant

Microstructure, tribological performances, and wear mechanisms of laser-cladded TiC-reinforced NiMo coatings under grease-lubrication condition

Morphological evolution of NbC particles at the interface of niobium–iron diffusion couple

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