Wear property of NiCoFeCrTi high entropy alloy coating by laser cladding

ZHENG Biju; WEI Jinyu; JIANG Yehua; ZHANG Xijun

doi:10.7510/jgjs.issn.1001-3806.2016.03.028

In order to improve the wear resistance of 45# steel, NiCoFeCrTi high entropy alloy coating was obtained by CO2 laser cladding on 45# steel. The phase structure, microstructure and chemical composition of NiCoFeCrTi high entropy alloy layer were analyzed by X-ray diffraction scanning electron microscope(SEM) and energy dispersive spectroscopy respectively. The result shows that the phase structure of NiCoFeCrTi high entropy alloy coating is face-centered cubic structure due to high-entropy effect. There are no micro-cracks in the cladding zone, the bounding zone and heat affected zone of NiCoFeCrTi high entropy alloy samples. The analysis of microstructure by SEM shows that the coating is metallurgically bonded to the substrate. The surface microhardness of NiCoFeCrTi high entropy alloys samples is up to 940HV, about 3 times that of the substrate. The wear volume loss of 45# steel sample with NiCoFeCrTi high entropy alloy coating is 5.010-10m3/m, less than 8.110-10m3/m of 45# steel. The results show that, NiCoFeCrTi high entropy alloy coating prepared by laser cladding technology can significantly improve the wear resistance of 45# steel and it is meaningful to coating applications.

Wear property of NiCoFeCrTi high entropy alloy coating by laser cladding

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Received Date: 2015-04-10

Accepted Date: 2015-05-11

Available Online: 2016-05-25

Abstract: In order to improve the wear resistance of 45# steel, NiCoFeCrTi high entropy alloy coating was obtained by CO2 laser cladding on 45# steel. The phase structure, microstructure and chemical composition of NiCoFeCrTi high entropy alloy layer were analyzed by X-ray diffraction scanning electron microscope(SEM) and energy dispersive spectroscopy respectively. The result shows that the phase structure of NiCoFeCrTi high entropy alloy coating is face-centered cubic structure due to high-entropy effect. There are no micro-cracks in the cladding zone, the bounding zone and heat affected zone of NiCoFeCrTi high entropy alloy samples. The analysis of microstructure by SEM shows that the coating is metallurgically bonded to the substrate. The surface microhardness of NiCoFeCrTi high entropy alloys samples is up to 940HV, about 3 times that of the substrate. The wear volume loss of 45# steel sample with NiCoFeCrTi high entropy alloy coating is 5.010-10m3/m, less than 8.110-10m3/m of 45# steel. The results show that, NiCoFeCrTi high entropy alloy coating prepared by laser cladding technology can significantly improve the wear resistance of 45# steel and it is meaningful to coating applications.

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Reference (14)

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Wear property of NiCoFeCrTi high entropy alloy coating by laser cladding

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