Structure and properties of laser-cladded Ni-based amorphous composite coatings

Jin, Yunxue; Li, R. F.; Zheng, Qichi; Li, H.; Wu, Mengrong

doi:10.1080/02670836.2015.1114310

Cited by 16 publications

(6 citation statements)

References 30 publications

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“…So far, some technologies, such as cathodic arc vapor deposition (CAVD) [ 10 ], magnetron sputtering [ 11 ], and laser cladding [ 12 , 13 ] have been employed to deposit HEA coatings. However, some drawbacks restrict the application of these technologies, such as the high cost and low deposition efficiency for magnetron sputtering, and the high residual stress and high dilution for laser cladding [ 14 , 15 ]. Since it is different from the above technologies, atmospheric plasma spraying (APS) is an appropriate technology for depositing HEA coatings, as those drawbacks can be overcome.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

Tian

Xiong

2018

Materials

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High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility–brittleness AlCoCrFeNiSi system was chosen as an object of study, and the detailed evolution of the surface morphology, particle size distribution, and microstructure of the powder during mechanical alloying was investigated. An AlCoCrFeNiSi HEA coating was deposited using powder milled for 10 h, which can be used as an ideal feedstock for APS. The surface morphology, microstructure, microhardness, and wear behavior of the coating at room temperature were investigated. The results showed that as the milling time increased, the particle size first increased, and then decreased. At the milling time of 10 h, simple body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases were formed. After spraying, the lamellar structure inside a single particle disappeared. An ordered BCC phase was detected, and the diffraction peaks of the Si element also disappeared, which indicates that phase transformation occurred during plasma spraying. A transmission electron microscopy analysis showed that nanometer crystalline grains with a grain size of about 30 nm existed in the APS coating. For the coating, an average microhardness of 612 ± 41 HV was obtained. Adhesive wear, tribo-oxidation wear, and slight abrasion wear took place during the wear test. The coating showed good wear resistance, with a volume wear rate of 0.38 ± 0.08 × 10−4 mm3·N−1·m−1, which makes it a promising coating for use in abrasive environments.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

Tian

Xiong

2018

Materials

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“…Hence, increasing scanning speeds is theoretically favorable to the formation of an amorphous structure. Jin et al [30] experimentally demonstrated that a higher scanning speed favored the formation of an amorphous phase in their work. However, the results in this study showed the opposite to the above deduction, where an amorphous microstructure tended to form at relatively lower scanning speed (6 mm/s) while dendrites formed at a higher speed (10 mm/s).…”

Section: Resultsmentioning

confidence: 99%

Influence of Scanning Speed on Microstructure and Properties of Laser Cladded Fe-Based Amorphous Coatings

Hou

Chang

et al. 2019

Materials

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Fe-based amorphous alloys with excellent mechanical properties are suitable for preparing wear resistant coatings by laser cladding. In this study, a novel Fe-based amorphous coating was prepared by laser cladding on 3Cr13 stainless steel substrates. The influence of scanning speeds on the microstructures and properties of the coatings was investigated. The microstructure compositions and phases were analyzed by scanning electron microscope, electron probe microanalyzer, and x-ray diffraction respectively. Results showed that the microstructures of the coatings changed significantly with the increase of scanning speeds. For a scanning speed of 6 mm/s, the cladding layer was a mixture of amorphous and crystalline regions. For a scanning speed of 8 mm/s, the cladding layer was mainly composed of block grain structures. For a scanning speed of 10 mm/s, the cladding layer was composed entirely of dendrites. Different dilution rates at the bonding zones were the main reasons for the microstructure change for different claddings. For all three scanning speeds, the coatings had higher hardness and wear resistance when compared with the substrate; as the scanning speed increased, the hardness and wear resistance of the coatings gradually decreased due to the change in microstructure.

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“…Due to their outstanding properties (e.g., high strength, sufficient hardness, and excellent wear resistance) [2][3][4][5][6], HEAs are a kind of promising coating materials used in harsh environments, especially at high temperature. So far, most of the HEA coatings have been prepared by electrochemical deposition [7], magnetron sputtering [8,9], and laser cladding [10,11]. However, the preparation and industrial application of HEA coatings are limited owing to the low deposition efficiency, high residual stress, high dilution, and high cost of these techniques.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Microhardness, and Wear Resistance of AlCoCrFeNiTi/Ni60 Coating by Plasma Spraying

2018

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In this comparative study, Ni60 was used as a reinforcement and added into an AlCoCrFeNiTi high-entropy alloy (HEA) matrix coating in order to enhance its hardness and wear resistance. An AlCoCrFeNiTi/Ni60 coating was prepared by plasma spraying with mechanically-blended AlCoCrFeNiTi/Ni60 powder. The coating microstructure was observed and analyzed. Bonding strength, microhardness, and wear resistance of the coating were investigated. The results showed that a compact AlCoCrFeNiTi/Ni60 coating with Ni60 splats uniformly distributed in the AlCoCrFeNiTi matrix was deposited. After spraying, matrix body-centered cubic (BCC), face-centered cubic, and ordered BCC phases were detected in the coating. The added large Ni60 particles played an important role in strengthening the coating. Tensile test results showed that bonding strength of this coating was above 60.1 MPa, which is far higher than that of the AlCoCrFeNiTi HEA coating in the previous study. An average microhardness of 676 HV was obtained for the main body of the coating, which is much higher than that of the AlCoCrFeNiTi HEA coating. Solution hardening in γ-Ni and dispersion strengthening of the hard interstitial compounds, such as Cr 7 C 3 , CrB, Cr 2 B, and Cr 23 C 6 increased the hardness of Ni60, and then the AlCoCrFeNiTi/Ni60 coating. During wear testing at 25 • C, adhesive wear and abrasive wear occurred, while, at 500 • C, abrasive wear took place. Volume wear rates of the coating at 25 • C and 500 • C were 0.55 ± 0.06 × 10 −4 mm 3 •N −1 •m −1 and 0.66 ± 0.02 × 10 −4 mm 3 •N −1 •m −1 , respectively. Wear resistance of this coating was better than that of the AlCoCrFeNiTi HEA coating, which can be attributed to addition of the hard Ni60. Therefore, Ni60 is an appropriate reinforcement to further enhance the wear resistance of HEA coating.

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Structure and properties of laser-cladded Ni-based amorphous composite coatings

Cited by 16 publications

References 30 publications

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

Influence of Scanning Speed on Microstructure and Properties of Laser Cladded Fe-Based Amorphous Coatings

Microstructure, Microhardness, and Wear Resistance of AlCoCrFeNiTi/Ni60 Coating by Plasma Spraying

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