Effect of CeO2 addition on thermal shock resistance of WC–12%Co coating deposited on ductile iron by electric contact surface strengthening

Qi, Xiaoben; Zhu, Shuguang

doi:10.1016/j.apsusc.2015.05.064

Cited by 22 publications

(3 citation statements)

References 23 publications

(24 reference statements)

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“…In the molten pool, the polarization of valence electrons promotes the inter-atomic bonding. 40,41 As a result, Ce elements reduce the Gibbs free energy required for the nucleation of hard phases TiB 2 , thereby facilitating the nucleation of more TiB 2 . Moreover, as shown in Figure 5(f), some Ce 2 O 3 is distributed around the hard phase TiB 2 , which demonstrates that Ce can promote the heterogeneous nucleation and precipitation of TiB 2 .…”

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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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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“…Different techniques were repeatedly applied to deposit the coating on the GCI’s surface. They are powder thermal spraying [ 17 ], arc spraying/sintering [ 18 ], physical vapor deposition [ 19 , 20 , 21 ], laser cladding [ 22 , 23 ], plasma surfacing [ 24 , 25 , 26 ], plasma spraying [ 27 , 28 ], electric contact deposition [ 29 ], etc., which were previously reported to improve GCI’s resistance to abrasive wear, corrosion, thermal fatigue, and cavitation damage.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

et al. 2021

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The structural and tribological properties of a protective high-chromium coating synthesized on gray cast iron by air pulse-plasma treatments were investigated. The coating was fabricated in an electrothermal axial plasma accelerator equipped with an expandable cathode made of white cast iron (2.3 wt.% C–27.4 wt.% Cr–3.1 wt.% Mn). Optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, microhardness measurements, and tribological tests were conducted for coating characterizations. It was found that after ten plasma pulses (under a discharge voltage of 4 kV) and post-plasma heat treatment (two hours of holding at 950 °C and oil-quenching), a coating (thickness = 210–250 µm) consisting of 48 vol.% Cr-rich carbides (M7C3, M3C), 48 vol.% martensite, and 4 vol.% retained austenite was formed. The microhardness of the coating ranged between 980 and 1180 HV. The above processes caused a gradient in alloying elements in the coating and the substrate due to the counter diffusion of C, Cr, and Mn atoms during post-plasma heat treatments and led to the formation of a transitional layer and different structural zones in near-surface layers of cast iron. As compared to gray cast iron (non-heat-treated and heat-treated), the coating had 3.0–3.2 times higher abrasive wear resistance and 1.2–1208.8 times higher dry-sliding wear resistance (depending on the counter-body material). The coating manifested a tendency of solidification cracking caused by tensile stress due to the formation of a mostly austenitic structure with a lower specific volume. Cracks facilitated abrasive wear and promoted surface spalling under dry-sliding against the diamond cone.

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“…High resistance against thermal fatigue and thermal shock are increasingly demanded for WC-Co cemented carbides (Tarragó et al, 2016;Emanuelli et al, 2016;Li et al, 2014;Qi & Zhu, 2015); accordingly, changes of mechanical behavior with temperature is particularly important for their applications. In the literature, the mechanical behavior of WC-Co cemented carbides at high temperatures has been investigated under different loading conditions such as bending (Suzuki et al, 1982;Milman et al, 2002;Mohand et al, 1982;Bolognini et al, 1998;Ö stberg et al, 2006;Acchar et al, 1999), compression (Lay et al, 1987;Teppernegg et al, 2016;Roebuck & Moseley, 2015), tensile tests and internal friction (Buss & Mari, 2004).…”

Section: Introductionmentioning

confidence: 99%

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

Fang

Liu

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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The microstructure evolution and changes in the structures of crystal defects of the nanocrystalline WC-Co composite in the process of uniaxial compression were studied by simulations at both room and high temperatures. The deformation processes were demonstrated as a function of stress and temperature for the stages prior to and after yielding of the composite. The Peierls stresses were evaluated for Co and WC dislocations with increasing temperature. The deformation mechanisms for each stage of the stress-strain curve were disclosed, in which the effect of temperature was clarified. It was found that with the increase of stress, from elastic deformation to plastic deformation then to yielding of the composite, the dominant mechanisms are grain boundary migration, formation and motion of dislocations in Co, concurrent motion and reaction of dislocations in Co and WC, and then rotation of WC grains in combination with motion of Co and WC dislocations. At the yielding stage, sliding of WC grain boundaries plays an increasingly important role in the contribution to plastic deformation at high temperatures. With strain the proportion of mobile dislocations decreases, and dislocations pile up at triple junctions of WC grains, WC/WC grain boundaries and WC/Co phase boundaries in priority order, leading to the nucleation and propagation of microcracks in these regions.

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Effect of CeO2 addition on thermal shock resistance of WC–12%Co coating deposited on ductile iron by electric contact surface strengthening

Cited by 22 publications

References 23 publications

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

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

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

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Effect of CeO2 addition on thermal shock resistance of WC–12%Co coating deposited on ductile iron by electric contact surface strengthening

Cited by 22 publications

References 23 publications

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

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

Evaluation of the Microstructure, Tribological Characteristics, and Crack Behavior of a Chromium Carbide Coating Fabricated on Gray Cast Iron by Pulsed-Plasma Deposition

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

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

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