Refinement mechanism of NbC by CeO2 in hypereutectic Fe-Cr-C hardfacing coating

Liu, Huan; Yuan, Xiaoming; Rao, Lixiang; Liu, Sha; Shi, Zhijun; Zhou, Yulin; Yang, Qingxiang

doi:10.1016/j.jallcom.2018.08.162

Cited by 22 publications

(9 citation statements)

References 31 publications

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“…The short dendrites and cellular crystals were dominant on the coating surface, indicating that a small amount of nano-CeO 2 promoted the formation and growth of grains. 25 The nano-CeO 2 destroyed the stable state of grain growth with the increase of nano-CeO 2 mass fraction, and the grains grew into the small dendrites and cellular crystals, which played a role in fine grain strengthening. 26 After crystallization, nano-CeO 2 became enriched at the grain boundary and reduced the surface tension and interfacial energy, which decreased the critical nucleation.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Dejun

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Nano-CeO2–reinforced NiCoCrAlY coatings were fabricated on Ti6Al4V alloy using laser cladding. The morphologies, chemical compositions, and phases of obtained coatings were analyzed using a scanning electron microscope, energy-dispersive spectrometer, and X-ray diffraction, respectively, and the effects of nano-CeO2 mass fraction on the coefficient of friction and the wear rate of NiCoCrAlY coating at 600 °C were investigated using a ball-on-disk wear test. The results show that the nano-CeO2–reinforced NiCoCrAlY coating is mainly composed of NiTi2, Ti3O, CoO, and β-Ti phases, while the new phases of AlTi3 and (Ni, Co)2Ti4O are formed after the wear test. The average coefficients of friction of NiCoCrAlY coatings with the nano-CeO2 mass fractions of 0%, 2%, 4%, and 6% are 0.699, 0.655, 0.636, and 0.615, respectively, and the corresponding wear rates are 4.04 × 10−7, 3.95 × 10−7, 3.13 × 10−7, and 2.35 × 10−7 mm3 N−1 m−1, respectively, which decrease with the increase of nano-CeO2 mass fraction. The wear mechanism is primary adhesive wear and oxidation wear, accompanied by slight abrasive wear, and the addition of nano-CeO2 is the main factor that is enhancing wear resistance.

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Section: Analysis and Discussionmentioning

confidence: 99%

Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Dejun

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…Niobium carbide (NbC) exhibits a face‐centered cubic crystal structure 5 . It is a heat‐resisting ceramic with a high melting point (3610°C), high hardness, high elastic modulus, high chemical stability, and high wear resistance 6,7 . These excellent properties enable niobium carbide to be used as hard material additives, wear‐resistant accessories, heating elements of resistance furnaces, and semiconductor materials 7 .…”

Section: Introductionmentioning

confidence: 99%

“…6,7 These excellent properties enable niobium carbide to be used as hard material additives, wear-resistant accessories, heating elements of resistance furnaces, and semiconductor materials. 7 The addition of NbC can make NbB 2 coatings show better mechanical properties than its respective monophase ceramic material, such as fracture toughness, mechanical strength, and hardness. 2 NbB 2 and NbC are considered A survey of the published literature modeling of CMCs has been studied by a n ers.…”

Section: Introductionmentioning

confidence: 99%

“…5 It is a heat-resisting ceramic with a high melting point (3610°C), high hardness, high elastic modulus, high chemical stability, and high wear resistance. 6,7 These excellent properties enable niobium carbide to be used as hard material additives, wear-resistant accessories, heating elements of resistance furnaces, and semiconductor materials. 7 The addition of NbC can make NbB 2 coatings show better mechanical properties than its respective monophase ceramic material, such as fracture toughness, mechanical strength, and hardness.…”

Section: Introductionmentioning

confidence: 99%

“…Preceramic polycarbosilane polymers are commonly used as precursors to make ceramic fibers 10,39 and ceramic matrix. [7][8][9]40,41 The chemical and volume changes that accompany ceramization of the polymer during pyrolysis have been documented in several studies. For example, see Refs [39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Effect of nano‐Al₂O₃ on the microstructure and properties of NbB₂‐NbC composite coatings prepared by plasma spraying

et al. 2021

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NbB2‐NbC composite coatings with or without Al2O3 addition had been fabricated via the plasma spraying method, respectively. The effect of nano‐Al2O3 on the microstructure and properties (microhardness, toughness and wear resistance) of sprayed NbB2‐NbC coating was explored. It was found that NbB2‐NbC coating exhibited loose microstructure, many pores and no obvious lamellar structure. NbB2‐NbC‐Al2O3 composite coating showed denser microstructure, fewer pores, and more obvious lamellar structure than NbB2‐NbC composite coating. NbB2‐NbC‐Al2O3 composite coating had high microhardness, good toughness, and excellent wear resistance, which could mainly attribute to the addition of nano‐Al2O3 leading the composite powder to melt more fully.

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Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

Cao,

Wang,

Wang

et al. 2024

steel research int.

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This article investigates the influence of niobium addition on the microstructure and properties of Ni–Cr cast iron. In situ observations and analysis of phase precipitation during solidification are conducted through a high‐temperature laser scanning confocal microscope and Thermo‐Calc software. The refining mechanism of the microstructure and the enhancement of wear resistance by NbC are explored. The results indicate that with an increase in Nb content, the precipitation temperature of NbC particles gradually rises. When the niobium content exceeds 0.2%, NbC becomes the first precipitated phase during the solidification of the liquid phase. NbC particles can serve as heterogeneous nucleus for austenite, refining the grain structure of Ni–Cr cast iron. The existence of NbC particles within the grain impedes the elongation of martensite and bainite bundles while providing additional nucleation sites to accelerate the phase transformation. The grain refinement and the obstructive influence of NbC particles collectively induce a more disordered bainitic structure. Moreover, the exceptional hardness of NbC particles effectively safeguards the matrix from abrasion, consequently enhancing the wear resistance of Ni–Cr cast iron.

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Refinement mechanism of NbC by CeO2 in hypereutectic Fe-Cr-C hardfacing coating

Cited by 22 publications

References 31 publications

Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Effect of nano‐Al₂O₃ on the microstructure and properties of NbB₂‐NbC composite coatings prepared by plasma spraying

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

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Refinement mechanism of NbC by CeO2 in hypereutectic Fe-Cr-C hardfacing coating

Cited by 22 publications

References 31 publications

Microstructure and friction-wear performances of laser-cladded nano-CeO2–reinforced NiCoCrAlY coatings at high temperature

Microstructure and friction-wear performances of laser-cladded nano-CeO2–reinforced NiCoCrAlY coatings at high temperature

Effect of nano‐Al2O3 on the microstructure and properties of NbB2‐NbC composite coatings prepared by plasma spraying

Refinement of Microstructure and Enhancement of Wear Resistance of Ni–Cr Cast Iron by NbC

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Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Microstructure and friction-wear performances of laser-cladded nano-CeO₂–reinforced NiCoCrAlY coatings at high temperature

Effect of nano‐Al₂O₃ on the microstructure and properties of NbB₂‐NbC composite coatings prepared by plasma spraying