Effect of process parameters on the microstructure and properties of laser-clad FeNiCoCrTi0.5 high-entropy alloy coating

Ying Zhang; Teng-fei Han; Meng Xiao; Yi-fu Shen

doi:10.1007/s12613-019-1958-7

International Journal of Minerals, Metallurgy, and Materials ›› 2020, Vol. 27 ›› Issue (5) : 630 -639. DOI: 10.1007/s12613-019-1958-7

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Effect of process parameters on the microstructure and properties of laser-clad FeNiCoCrTi_0.5 high-entropy alloy coating

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Abstract

FeNiCoCrTi_0.5 coatings with different process parameters were fabricated by laser cladding. The macro-morphology, phase, micro-structure, hardness, and wear resistance of each coating were studied. The smoothness and dilution rate of the FeNiCoCrTi_0.5 coating generally increased with the increase of specific energy (E _s), which is the laser irradiation energy received by a unit area. FeNiCoCrTi_0.5 coatings at different parameters had bcc, fcc, and Ti-rich phases as well as equiaxed, dendritic, and columnar structures. When E _s increased, the size of each structure increased and the distribution area of the columnar and dendritic structures changed. The prepared FeNiCoCrTi_0.5 coating with the E _s of 72.22 J·mm⁻² had the highest hardness and the best wear resistance, the highest hardness of the coating reached HV 498.37, which is twice the substrate hardness. The average hardness of the FeNiCoCrTi_0.5 coating with the E _s of 72.22 J·mm⁻² was 15.8% higher than the lowest average hardness of the coating with the E _s of 108.33 J·mm⁻². The worn surface morphologies indicate that the FeNiCoCrTi_0.5 coatings exhibited abrasive wear.

Keywords

high-entropy alloy coating / 45 steel / laser cladding / microstructure / wear resistance

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Ying Zhang, Teng-fei Han, Meng Xiao, Yi-fu Shen. Effect of process parameters on the microstructure and properties of laser-clad FeNiCoCrTi_0.5 high-entropy alloy coating. International Journal of Minerals, Metallurgy, and Materials, 2020, 27(5): 630-639 DOI:10.1007/s12613-019-1958-7

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