Influence of La 2 O 3 addition on nano indentation hardness and residual stress of Stellite 6 coating prepared by plasma cladding

Fang, Yongchao; Cui, Xiufang; Cai, Zhipeng; Wang, Chang; Jin, Guo

doi:10.1016/j.jre.2018.03.008

Cited by 22 publications

(6 citation statements)

References 26 publications

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“…Zhu Kaihuan et al modified the metal alloy coatings using rare earth oxides La 2 O 3 and Nd 2 O 3 and proved that modified rare earth coatings contained significantly less cracks, causing the structure to become quite refined and dense. The microhardness could also be increased 2-3 times with improved oxidation resistance [16,17]. The effects of Y 2 O 3 and La 2 O 3 on the properties of the Ni-based cladding coatings were reported by Meiyan Li et al [18,19], and similar results were obtained with the addition of certain amounts of rare earth oxides, including a refined structure, coating uniformity, increased microhardness, and wear resistance, as well as improved fracture toughness.…”

Section: Introductionmentioning

confidence: 78%

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Shu

Cui

et al. 2020

Metals

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In this study, the addition of the rare earth oxide CeO2 was investigated to alter the microstructural properties of the nano-WC-reinforced Ni-based composite coatings. The reinforced composite was prepared on the 42CrMo steel surface using a semiconductor laser. The morphology and microstructure of coatings were analyzed using a scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Further, the digital microhardness tester and high-temperature friction and wear tester were used to observe the mechanical properties. The results indicated that the addition of CeO2 eliminated the cracks from the surface of the coatings and effectively reduced the number of pores. The phases were mainly observed as γ-Ni(Fe) in a solid solution, and some residual WC and W2C phases were observed. In addition, Fe3C, Cr23C6, M6C (M = W, Fe, and Ni), SiC and Cr7C3 composite carbides, Si2W and NiW tungsten compounds, and CeFe2- and CeNi2-containing Ce complex compounds were formed on the coating. The rare earth oxide CeO2 composite-modified coating mainly comprised dendrites, crystal cells, strips, and massive microstructures. The reinforced phases of the modified coating presented uniform dispersion distribution with the addition of 1% CeO2, and the structures were significantly refined. The maximum microhardness of the modified coating was approximately 1560 HV0.2, which was approximately 20% higher than that of the unmodified composite coating. The minimum wear loss of the modified coating was 6.1 mg and the minimum frictional coefficient was approximately 0.23, which were better than those of the unmodified coating. The wear mechanism of the nano-WC-reinforced Ni-based coating was primarily adhesive, whereas that of the CeO2 composite modified coating was mainly abrasive particle wear, which accompanied adhesive wear.

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Section: Introductionmentioning

confidence: 78%

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Shu

Cui

et al. 2020

Metals

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“…In addition to the grain refining effect, CeO 2 powder also improves the fluidity of the molten pool, facilitates the reaction between alloying elements in the coating, and promotes a more homogeneous distribution of phases. Liu et al 31 and Fang et al 43 have demonstrated that CeO 2 can improve the physical compatibility of materials and reduce the residual stress during solidification. Taken above, CeO 2 expands the process window of Ni60A coatings on the Ti6Al4V substrate and improves the overall quality of the coating cladded on the substrate.…”

Section: Resultsmentioning

confidence: 99%

Effect of CeO₂ on the TiB₂ + TiC evolution and water droplet erosion resistance of laser-clad Ni60A coatings

Cui

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this study, CeO2-doped Ni60A coating was fabricated on the surface of Ti6Al4V alloys. During the fabrication, heterogeneous nucleation occurred between TiB2 and TiC phases within Ni60A coatings, and the TiB2 + TiC eutectic structure was thereby generated. Ce2O3 phases were formed in-situ by the decomposition of CeO2 powder in the molten pool. On the grain boundary of the CeO2-doped Ni60A coating, Ce2O3 particles were distributed, which inhibited the growth of hard phases TiC and TiB2. Compared with the coating without adding CeO2 powder, the CeO2-doped Ni60A coating had significantly lower crack sensitivity, and the TiB2 phase in the CeO2/Ni60A coating had a far smaller grain size due to the grain refinement effect. In addition, the TiC + TiB2 eutectic structure acted as the skeleton in the coating, enabling the coating to effectively resist the shear effect caused by high-speed water particles. After coating Ni60A and CeO2/Ni60A on the Ti6Al4V alloy, the water droplet erosion depth of the alloy was reduced by 38.7% and 53.2%, respectively. Therefore, adding CeO2 powder into Ni60A coatings has great application value in improving the water droplet erosion resistance of steam turbine blades.

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“…CeO 2 -modified cobalt-based composite coatings still consist of γ-Co, γ-Ni, M 7 C 3 , and M 23 C 6 (M = Cr, W, Fe). No diffraction peaks of CeO 2 are observed in the XRD patterns, which may be due to the relatively small mass fraction of CeO 2 powder (0-4 wt.%) and the very small particle size of CeO 2 in the cobalt-based composite alloy powder in the current experiment [16,17].…”

Section: Microstructure Characteristicsmentioning

confidence: 88%

Microstructure and Properties of Direct Laser-Deposited CeO2-Modified Cobalt-Based Composite Coatings

et al. 2023

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The seawater circulation pump is a significant piece of equipment in coastal nuclear power plants that is susceptible to erosion and corrosion in the seawater. In this work, CeO2-modified cobalt-based composite coatings were prepared on the surface of martensitic stainless steel by direct laser deposition. The effect of CeO2 on the phase composition, microstructure, microhardness, corrosion resistance, and erosion properties of the cobalt-based composite coatings was systematically investigated. While the addition of CeO2 did not affect the phase composition of the coatings that comprised γ-Co, γ-Ni, M7C3, and M23C6 (M = Cr, W, Fe) metallic carbides, the eutectic organization showed an obvious phenomenon of contiguous aggregation. Microscopic pores were found in the coatings with 2 wt.% CeO2, and the number of pores increased with the increase in CeO2 content. Despite the higher self-corrosion potential (−0.27668 V) of cobalt-based alloy coating compared to the substrate (−0.37019 V), indicating enhanced corrosion resistance, the difference in self-corrosion potential among coatings with varying CeO2 addition amounts is small (0.027 V), and the corrosion current densities are within one order of magnitude (10−8 A/cm2). These findings suggest that the addition of CeO2 has no significant impact on the coating’s corrosion resistance.

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Influence of La 2 O 3 addition on nano indentation hardness and residual stress of Stellite 6 coating prepared by plasma cladding

Cited by 22 publications

References 26 publications

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Effect of CeO₂ on the TiB₂ + TiC evolution and water droplet erosion resistance of laser-clad Ni60A coatings

Microstructure and Properties of Direct Laser-Deposited CeO2-Modified Cobalt-Based Composite Coatings

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Influence of La 2 O 3 addition on nano indentation hardness and residual stress of Stellite 6 coating prepared by plasma cladding

Cited by 22 publications

References 26 publications

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Effect of the Rare Earth Oxide CeO2 on the Microstructure and Properties of the Nano-WC-Reinforced Ni-Based Composite Coating

Effect of CeO2 on the TiB2 + TiC evolution and water droplet erosion resistance of laser-clad Ni60A coatings

Microstructure and Properties of Direct Laser-Deposited CeO2-Modified Cobalt-Based Composite Coatings

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Effect of CeO₂ on the TiB₂ + TiC evolution and water droplet erosion resistance of laser-clad Ni60A coatings