Microstructure and properties of Fe₅Cr₅SiTiCoNbMoW coating by laser cladding

Abstract

To improve anti-corrosion and wear resistance, a new kind of Fe 5 Cr 5 SiTiCoNbMoW high-entropy alloy (HEA) coating was fabricated successfully on Q235 by laser cladding technology. The microstructure, phase structure, microhardness, anti-corrosion and wear resistance were researched using metallographic microscope, scanning electron microscope, X-ray diffraction, microhardness tester, electrochemical workstation as well as friction and wear testing machine, respectively. The experimental results show that the microstructure of cladding coating is composed of dendrite and eutectic crystal. The main phase in the coating is single body-centered cubic solid solution. The anti-corrosion of HEA coating is better than that of 304 stainless steel in NaCl solution. Moreover, the average microhardness of HEA coating is nearly 600 HV 0.2 , which is almost five times higher than that of Q235 substrate. The HEA coating is of low friction coefficient and mass loss, exhibiting excellent wear resistance.

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

“…To the contrary, close to the substrate the 2-4 μm th jor bcc-phase crystallizes first. The double-phase structure with wett Similar behavior of the GB wetting in the cross-section of two-phase l was observed for the AlxMo0.5NbFeTiMn2 (x = 1, 1.5, 2) alloys [79], AlC 0.5, 1, 1.5, 2) alloys [80], FeCrCoAlMn0.5Mo0.1 HEA [81], and Fe5Cr5Si [82]. In the last case, the 5-7 μm thick one-phase layer close to the seen.…”

“…The double-phase structure with wetted GBs forms later. Similar behavior of the GB wetting in the cross-section of two-phase laser-cladded HEAs was observed for the Al x Mo 0.5 NbFeTiMn 2 (x = 1, 1.5, 2) alloys [79], AlCrFeNi 2 W 0.2 Nb x (x = 0.5, 1, 1.5, 2) alloys [80], FeCrCoAlMn 0.5 Mo 0.1 HEA [81], and Fe 5 Cr 5 SiTiCoNbMoW HEA [82]. In the last case, the 5-7 µm thick one-phase layer close to the substrate is clearly seen.…”

Effect of Heat Treatment on Microstructure and Tribocorrosion Performance of Laser Cladding Ni-65 WC Coating

“…To solve these problems, researchers have prepared high hardness, antiwear, and corrosion-resistant coating on the surface of Q235 steel by laser cladding technology. And the composite coating has better development potential in the future due to saving a lot of precious metal materials and reducing production cost and energy consumption [4][5][6][7].…”

Wear and Corrosion Resistance of Al0.5CoCrCuFeNi High-Entropy Alloy Coating Deposited on AZ91D Magnesium Alloy by Laser Cladding

“…So far, many methods such as arc melting [ 8 ], Tungsten Inert Gas Arc Welding (TIG) [ 9 ], Gas Tungsten Arc Welding (GTAW) [ 10 ], mechanical alloying [ 11 ], DC sputtering [ 12 ], thermal spay technology [ 13 ], and laser cladding [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ] have been adopted to prepare different high-entropy alloys or coatings. Among them, the laser cladding method has attracted special attention because of its advantages of rapid heating, rapid cooling, compact coating, and low dilution rate, etc.…”

“…[ 19 ]. At present, the preparation of high-entropy alloy coatings by laser cladding mainly focuses on the microstructure and properties of different matrix materials such as Ti-6Al-4V [ 14 , 15 ], carbon steel [ 16 , 17 , 18 , 19 , 20 , 21 ], stainless steel [ 22 , 23 , 24 ], tool steel [ 25 ], die steel [ 26 ], aluminum [ 27 ], magnesium [ 28 , 29 , 30 ], and magnesium alloys [ 31 , 32 ], and different high-entropy coatings [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. It should be noted that the study of the preparation of high-entropy alloy coatings on magnesium and magnesium alloys by laser cladding was mainly carried out by a few researchers: Yue [ 28 , 29 , 31 ], Huang [ 32 ], and Meng [ 30 ].…”