Effect of Nitriding Treatment on the Microstructure and Wear Properties of HVOF Sprayed Al1-xCoCrFeNiTix(x=0，0.125，0.250) High-Entropy Alloy Coatings

GUO Yuyao, ZHOU Yongkuan, ZHU Lina, KANG Jiajie, MA Guozheng

doi:10.16577/j.issn.1001-1560.2023.0186

2023 , Vol. 56 >Issue 8: 56 - 63

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0186

Effect of Nitriding Treatment on the Microstructure and Wear Properties of HVOF Sprayed Al_1-xCoCrFeNiTi_x(x=0，0.125，0.250) High-Entropy Alloy Coatings

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1.School of Engineering Technology，China University of Geosciences (Beijing)，Beijing 100083，China；2.School of Materials Science and Engineering，Jiangsu University of Science and Technology，Zhenjiang 212100，China；3.Zhengzhou Research Institute，China University of Geosciences (Beijing)，Zhengzhou 451283，China；4.National Key Laboratory for Remanufacturing，Army Academy of Armored Forces，Beijing 100072，China

Received date: 2023-06-15

Revised date: 2023-07-15

Accepted date: 2023-08-12

Online published: 2023-08-25

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Abstract

For studying the effect of nitriding treatment on the microstructure and wear properties of HVOF sprayed Al1-xCoCrFeNiTix(x＝0，0.125，0.250) high-entropy alloy coatings，the HVOF technology was employed to prepare Al1-xCoCrFeNiTix(x＝0，0.125，0.250) highentropy alloy coating on 35CrMo steel substrate，which were further nitrided.The effects of nitriding treatment on the microstructure and wear properties of Al1-xCoCrFeNiTix(x＝0，0.125，0.250) high-entropy alloy coating prepared by HVOF were studied via characterization methods such as SEM，XRD，3D white light interferometer and EDS.Results showed that the high-entropy alloy coating of Al1-xCoCrFeNiTix(x＝0，0.125，0.250) after nitriding treatment had a dense microstructure with a typical thermal spray coating-like structure.The coating thickness was about 300～350 μm，the nitriding layer thickness was about 10 μm，and the nitriding layer phase structure was FCC phase and AlN，CrN and other nitriding phases.Meanwhile，the microhardness of the nitriding layer was 981 HV2N(x＝0)，1 090 HV2N(x＝0.125) and 1 194 HV2N(x＝0.250)，respectively，which was significantly improved compared with the microhardness of 479 HV2N(x＝0)，506 HV2N(x＝0.125) and 548 HV2N(x＝0.250) of the unnitrided high-entropy alloy coating.With the increase of Ti content，the wear resistance of the nitriding layer increased，and Al0.750CoCrFeNiTi0.250nitriding layer possessed the best wear resistance [(2.17×10-6mm3/(N·m)].Besides，the wear failure mechanism of Al1-xCoCrFeNiTix(x＝0，0.125，0.250) nitriding layer was mainly abrasive wear，oxidation wear and adhesive wear.

Key words： nitriding; high-entropy alloy coating; HVOF; microstructure; wear

Cite this article

GUO Yuyao, ZHOU Yongkuan, ZHU Lina, KANG Jiajie, MA Guozheng . Effect of Nitriding Treatment on the Microstructure and Wear Properties of HVOF Sprayed Al_1-xCoCrFeNiTi_x(x=0，0.125，0.250) High-Entropy Alloy Coatings[J]. Materials Protection, 2023 , 56(8) : 56 -63 . DOI: 10.16577/j.issn.1001-1560.2023.0186

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