In-situ Ti(C, N) reinforced AlCoCrFeNiSi-based high entropy alloy coating with functional gradient double-layer structure fabricated by laser cladding

Yan, Ge; Zheng, Min; Yu, Zhenhua; Gu, Jianfeng; Li, Chuanwei; Wu, Chengge; Wang, Baoping

doi:10.1016/j.jallcom.2021.161252

Cited by 27 publications

(14 citation statements)

References 39 publications

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“…Therefore, the wear resistance is greatly improved, while the interface between the HEA matrix and the directly added ceramic particles is poor, whereas the ceramic phase synthesized in situ has a better interface adhesion with the HEA matrix. Guanghua Yan et al [42] successfully prepared in-situ HEA coatings with a functional gradient double-layer structure on the surface of H13 steel by laser cladding technology, which significantly improved the wear resistance of the substrate.…”

Section: The Chemical Composition System Of Laser Cladding Hea Coatingsmentioning

confidence: 99%

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

Zhu

Guo

et al. 2022

Coatings

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Nowadays, high-entropy alloys (HEAs) have become a hot research topic in the field of coating materials. However, HEAs have a large wide range of compositional systems, and the differences in their composition inevitably lead to the significant variations in the matching process parameters of laser cladding and post-treatment methods, which in turn give the coatings a broad range of microstructures and protective properties. Therefore, it is crucial to review and summarize the research progresses on laser cladding HEA coatings to provide a reference for obtaining high-performance HEA coatings and further expand the application of HEA coatings. This work describes the working mechanism of laser cladding and illustrates the advantages and drawbacks of laser cladding in detail. The effects of the addition of alloying elements, process parameters and post-treatment techniques on the microstructures and properties of the coatings are thoroughly reviewed and analyzed. In addition, the correlations between the chemical compositions of HEAs, process parameters of laser cladding, post-treatment techniques and the microstructure and protective properties of the coatings are investigated and summarized. On this basis, the future development direction of HEA coatings is outlined.

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Section: The Chemical Composition System Of Laser Cladding Hea Coatingsmentioning

confidence: 99%

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

Zhu

Guo

et al. 2022

Coatings

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“…In Ref. [95], the double layer AlCoCrFeNiSi-based HEA coating reinforced in situ by Ti(C, N) was fabricated on the H13 steel substrate using laser cladding with coaxia powder feeding direct laser deposition system equipped with an ytterbium fiber laser The equiatomic CoCrFeNi HEA powders were mixed with high-purity Ti and C pow ders giving the molar ratio of CoCrFeNi, Al, Si, Ti to C powder as 8:1:1:1:1. Considerin the dilution of melted substrate in the HEA molten pool, a double-layer gradient coatin is fabricated on the substrate.…”

Section: Gb Wetting In Multitrack and Multilayer Hea Coatingsmentioning

confidence: 99%

“…The titanium carbonitride Ti(CN) (appears red in Figure 21c) has a shape of isolated round particles and does not "participate" in GB wetting. It is supposed in [95] that the titanium diffusion into carbon powder particles leads to the nucleation of TiC carbide particles in the melt. Afterwards, the TiC carbide particles grow during solidification.…”

Section: Gb Wetting In Multitrack and Multilayer Hea Coatingsmentioning

confidence: 99%

High Entropy Alloys Coatings Deposited by Laser Cladding: A Review of Grain Boundary Wetting Phenomena

et al. 2022

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High-entropy alloys (HEAs) are called also alloys without a main component or multiprincipal alloys. They consist of five, six or more components in more or less equal proportions and possess unique properties. Several dozens of thousands of publications have already been devoted to bulk HEAs, while HEA coatings are just beginning to develop. More than half of the works on the deposition of HEA coatings are devoted to laser cladding. In the laser cladding process, a mixture of powders on a substrate is melted in a focused laser beam, which sequentially scans the substrate. In the heated zone, the powder mixture melts. At the end of the crystallization process, a solidified polycrystal and a small amount of residual melt are found in the heated zone. It is possible that the grain boundaries (GBs) in the solidified polycrystal are incompletely or fully wetted by this liquid phase. In this way, the GB wetting with a melt determines the morphology and microstructure of HEAs coatings. This review analyzes GB wetting in single-phase HEAs, as well as in HEAs containing two or more phases. We analyze how the HEAs’ composition, laser scanning speed, laser beam power, external magnetic field or ultrasonic impact affect the microstructure and GB wetting. It is also shown how the microstructure and GB wetting change over the thickness of the rather thick as well as multilayer coatings deposited using a laser cladding.

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“…This is because a certain volume of the substrate melted during the laser-cladding process and mixed with the HEA coating [26]. The working temperature of the laser spot reaches 3500 • C, which is far beyond the melting point of the Q245R substrate (c. 1371-1538 • C), thus it is common for the substate to melt when using the laser cladding technique [29]. Although the mole ratio of the element was not equal, the BCC solid solution phase mainly formed after laser coating and remained steady after annealing.…”

Section: Microstructuresmentioning

confidence: 99%

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Shen

Zhao

et al. 2021

Crystals

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In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using X-ray diffraction (XRD), a scanning electron microscope (SEM), a Vickers hardness tester and a roller friction wear tester. The results showed that the coating was mainly composed of body-centered cubic (BCC) solid solution and face-centered cubic (FCC) structural (Nb,Ti)C carbides prior to annealing, exhibiting an interdendritic structure and needlelike dendritic crystal structure with average microhardness of 682 HV0.2. The coarsening of the dendrite arms increased gradually after a 10-h long annealing treatment at 800 °C, 900 °C and 1000 °C, and a small amount of Laves phase was produced. After annealing, the highest microhardness value of the as-annealed coating reached 1176 HV0.2, which represents an increase of approximately 72.5% compared to that of the as-deposit coating. The wear resistance testing results imply that this type of coating retains good wear resistance following the annealing treatment and that its wear resistance increases in proportion to the annealing temperature in a range from 800 °C to 1000 °C.

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In-situ Ti(C, N) reinforced AlCoCrFeNiSi-based high entropy alloy coating with functional gradient double-layer structure fabricated by laser cladding

Cited by 27 publications

References 39 publications

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

Microstructures, Corrosion Resistance and Wear Resistance of High-Entropy Alloys Coatings with Various Compositions Prepared by Laser Cladding: A Review

High Entropy Alloys Coatings Deposited by Laser Cladding: A Review of Grain Boundary Wetting Phenomena

Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

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