| LI Gang,ZHANG Jing-bo,LIU Jian,SONG Yan-dong,GUO Yu-jie,FU Xiao-fan.Microstructure and Properties of High Entropy Alloy Composite Coating Prepared by Laser with Raw Chromite Powder[J],48(3):228-233 |
| Microstructure and Properties of High Entropy Alloy Composite Coating Prepared by Laser with Raw Chromite Powder |
| Received:October 12, 2018 Revised:March 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.03.031 |
| KeyWord:laser cladding high entropy alloys raw chromite powder composite coating microstructure wear resistance |
| Author | Institution |
| LI Gang |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
| ZHANG Jing-bo |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
| LIU Jian |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
| SONG Yan-dong |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
| GUO Yu-jie |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
| FU Xiao-fan |
School of Material Science and Engineering, Liaoning Technical University, Fuxin, China |
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| Abstract: |
| The work aims to prepare high entropy alloy composite coating with the raw chromite powder quickly so as to improve surface hardness and wear resistance by studying the microstructure and properties. The high entropy alloy composite coatings were prepared on the surface of 40Cr steel by laser cladding. The microstructure, phase structure and mechanical prop-erties of high entropy alloy composite coatings at different depths were studied by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD), hardness tester and abrasive wear machine. The high entropy alloy composite coating had good bonding morphology with the substrate, the phase was simple supersaturated solid solution with BCC structure. The microstructure was a typical cellular and dendrite structure, and the fine carbide particles formed in situ were dispersed on the substrate. When the depth was 0.1 mm, the microstructure of the composite coating was the smallest, where a certain degree of segregation happened. The average microhardness of the composite coating was about 6.48 GPa, which was more than 2 times of the 40Cr steel substrate. The wear rate of the high entropy alloy composite coating was lower than that of the substrate, and with the depth increasing, the wear rate increased gradually. When the depth was 0.1 mm, the wear rate of 0.17 mg/mm2 was the smallest, which indicated wear resistance was the best. The high entropy alloy composite coating with in-situ particle reinforced phaseis successfully prepared by laser cladding technology with the raw chromite powder as the doping component. The hardness and wear resistance of the substrate surface are greatly improved. |
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