| WANG Hui-lin,GUO Ya-xiong,LAN Hong-wei,LIU Qi-bin,ZHOU Fang.Effect of Spot Type on Microstructure and Properties of MoFeCrTiWAlNb Refractory High-entropy Alloy Coating Fabricated by Laser Cladding[J],48(6):130-137 |
| Effect of Spot Type on Microstructure and Properties of MoFeCrTiWAlNb Refractory High-entropy Alloy Coating Fabricated by Laser Cladding |
| Received:November 19, 2018 Revised:June 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.014 |
| KeyWord:laser cladding rectangular spot MoFeCrTiWAlNb high-entropy alloy coating hcp-Fe2Nb wear resistance |
| Author | Institution |
| WANG Hui-lin |
1.a. School of Materials and Metallurgy, Guizhou University, Guiyang , China |
| GUO Ya-xiong |
1.a. School of Materials and Metallurgy, Guizhou University, Guiyang , China |
| LAN Hong-wei |
1.a. School of Materials and Metallurgy, Guizhou University, Guiyang , China |
| LIU Qi-bin |
1.a. School of Materials and Metallurgy, b. Guizhou Province Key Laboratory of Materials Structure and Strength, Guizhou University, Guiyang , China |
| ZHOU Fang |
1.a. School of Materials and Metallurgy, Guizhou University, Guiyang , China |
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| Abstract: |
| The work aims to obtain tool steel coatings with excellent performance. MoFeCrTiWAlNb high-entropy alloy (HEA) coatings were fabricated by rectangular-spot and circular-spot laser cladding technique on M2 tool steel. The microstructure and properties of high entropy alloy coatings under two spot processes were comparatively analyzed. The microstructure, chemical composition and phase structure of the two coatings were characterized by SEM, XRD and EDS. The hardness and wear resistance of the two coatings were measured by microhardness tester and friction and wear tester, respectively. After milling for 4 h, the alloy powders were not alloyed but deformed. The alloy powders became fine and uniform and the average diameter reached 56.1 μm. The main phase structure of circular-spot laser cladding HEA coating consisted of BCC and MC carbide. The main phase structure of rectangular-spot laser cladding HEA coating consisted of BCC, hcp-Fe2Nb phase and MC carbide. The obvious phase separation was observed in the circular-spot laser cladding HEA coating. The rectangular-spot laser cladding layer exhibited shallow fusion depth and low dilution rate. The microstructure was composed of irregular dendrites and square carbides. Moreover, the average hardness of rectangular-spot laser cladding coating was about 850HV, and that of circular-spot laser cladding coating was about 680HV. The rectangular-spot laser cladding HEA coating possessed more outstanding wear resistance with lower friction coefficient, fewer wear volume loss and smoother worn profile, compared with circular-spot laser cladding HEA coating. The main wear mechanism was abrasive wear. Therefore, rectangular spot is more suitable for laser cladding of MoFeCrTiWAlNb HEA coating. |
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