Wear and Corrosion Resistance of Laser Cladding CoCrFeNiSi x High Entropy Alloy Coating

doi:10.11901/1005.3093.2023.562

Chinese Journal of Materials Research

2024, Vol. 38

Issue (10): 741-750 DOI: 10.11901/1005.3093.2023.562

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Wear and Corrosion Resistance of Laser Cladding CoCrFeNiSi _x High Entropy Alloy Coating

ZHANG Zejiang, LI Xinmei(

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School of Mechanical Engineering, Xinjiang University, Urumqi 830000, China

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ZHANG Zejiang, LI Xinmei. Wear and Corrosion Resistance of Laser Cladding CoCrFeNiSi _x High Entropy Alloy Coating. Chinese Journal of Materials Research, 2024, 38(10): 741-750.

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Abstract

A high entropy alloy CoCrFeNiSi _x (x = 0.2, 0.6, 1) coating was deposited onto 40Cr steel surface by means of laser cladding technique. The phase composition, microstructure, hardness, friction and wear behavior, as well as electrochemical corrosion properties of the coating in 3.5%NaCl solution were systematically investigated with emphasis on the effect of Si element on the high entropy alloy coating. Results reveal that with the increasing in Si content, the high entropy alloy coatings experienced transformation of phase composition from single face-centered cubic structure to face-centered cubic structure with silicide σ phase and finally to face-centered cubic structure with body-centered cubic structure and σ phase. The microstructure of the coating evolves from equiaxial to columnar and dendritic morphology. The microhardness of the coating increases with the increasing Si content; when x = 1, it reaches the maximum value 498.92HV, which is about 2.52 times higher than that of the substrate, which may be due to solid solution strengthening caused by lattice distortion induced by Si addition and second-phase strengthening resulting from intermetallic compound σ phase formation within the coating matrix. Moreover, with the increasing Si content, the wear rate and average friction coefficient reduced gradually; when x = 1, the friction coefficient decreases significantly to around 0.309, indicating that the improved tribological performance mainly attributed to changes in wear mechanism from adhesive wear or delamination wear towards abrasive, so that the wear resistance is enhanced under dry sliding conditions. The corrosion resistance of alloy coatings in 3.5%NaCl solution is also improved gradually with the increasing Si content, reaching its optimum value by x = 1.

Key words: metallic materials high entropy alloy laser cladding microstructure wear resistance corrosion resistance

Received: 24 November 2023

ZTFLH:

TG174.4

Fund: National Natural Science Foundation of China(52161017);Natural Science Foundation of Xinjiang Uygur Autonomous Region(2022D01C386)

Corresponding Authors: LI Xinmei, Tel: 13699372889, E-mail: lxmxj@126.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.562 OR https://www.cjmr.org/EN/Y2024/V38/I10/741

Fig.1 XRD patterns of CoCrFeNiSi _x (x = 0.2, 0.6, 1) high-entropy alloy coatings

Fig.2 Microstructure morphology of CoCrFeNiSi _x (x = 0.2, 0.6, 1) high-entropy alloy (a, b) Si_0.2; (c, d) Si_0.6; (e, f) Si₁

Table 1 EDS analysis of test points of CoCrFeNiSi _x (x = 0.2, 0.6, 1) coating

Fig.3 Mapping of CoCrFeNiSi _x (x = 0.2, 0.6, 1) alloy coating (a) Si_0.2; (b) Si_0.6; (c) Si₁

Fig.4 Microhardness of CoCrFeNiSi _x (x = 0.2, 0.6, 1) alloy coating

Fig.5 Friction and wear curves of substrate and coating

Fig.6 Average friction coefficient (a) weight loss and (b) of substrate and coating

Fig.7 Wear profile curves and wear cross-section area of 40Cr matrix and CoCrFeNiSi _x (x = 0.2, 0.6, 1) alloy coating (a, b)40Cr matrix; (c, d) Si_0.2

Fig.8 Wear volume and wear rate of substrate and coating

Fig.9 Morphology of wear marks of the substrate and coating (a, b) 40Cr; (c, d) Si_0.2; (e, f) Si_0.6; (g, h) Si₁

Fig.10 Polarization curves of substrate and coating in 3.5%NaCl solution

Table 2 Electrochemical parameters of substrate and coatings with different Si content

Fig.11 Electrochemical impedance spectra of substrate and coatings with different Si content (a) Nyqu-ist plot; (b) Bode plot; (c) equivalent circuit

Table 3 Electrochemical impedance fitting results of substrate and coating

Fig.12 Corrosion morphology of substrate and coating in 3.5%NaCl solution (a, b) 40Cr; (c, d) Si_0.2; (e, f) Si_0.6; (g, h) Si₁

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