| ZUO Run-yan,SUN Rong-lu,NIU Wei,HAO Wen-jun,GU Mi,LI Xiao-long.Microstructure and Properties of CoCrFeNiTix High Entropy Alloy Coated by Laser Cladding[J],51(3):363-370 |
| Microstructure and Properties of CoCrFeNiTix High Entropy Alloy Coated by Laser Cladding |
| Received:April 16, 2021 Revised:July 19, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.039 |
| KeyWord:laser cladding high-entropy alloy Ti CoCrFeNi macro morphology microstructure microhardness corrosion resistance |
| Author | Institution |
| ZUO Run-yan |
School of Mechanical Engineering, Tiangong University, Tianjin , China |
| SUN Rong-lu |
School of Mechanical Engineering, Tiangong University, Tianjin , China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin , China |
| NIU Wei |
School of Mechanical Engineering, Tiangong University, Tianjin , China;Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin , China |
| HAO Wen-jun |
School of Mechanical Engineering, Tiangong University, Tianjin , China |
| GU Mi |
School of Mechanical Engineering, Tiangong University, Tianjin , China |
| LI Xiao-long |
School of Mechanical Engineering, Tiangong University, Tianjin , China |
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| Abstract: |
| The work aims to study the effect of Ti content on the microstructure and properties of laser cladding CoCrFeNi high-entropy alloy coating. Laser cladding technology was used to prepare CoCrFeNiTix (x=0, 0.2, 0.4, 0.6, 0.8) high-entropy alloy cladding layer on the surface of 45 steel, and Leica DVM6 optical microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD), micro-hardness tester, electrochemical workstation and other equipment were adopted to analyze and study the macro morphology, microstructure, micro-hardness value and corrosion resistance of single-pass and multi-pass cladding samples. With the increase of Ti content, the dilution rate of the cladding layer gradually increased, the metallurgical binding performance between the coating and the substrate became better, but the surface forming quality became worse and needed to be further optimized. As the Ti content increased, the face-centered cubic (FCC) phase changed to face-centered cubic (FCC) and body-centered cubic (BCC) phases. As the Ti content increased, the structure of the cladding layer changed from branch crystals to isometric crystals without obvious orientation and the grains tended to be refined. The hardness of the cladding layer gradually increased with the increase of the added Ti content, and the hardness value increased to 502.39HV0.3 at x=0.8. With the increase of the Ti content, the corrosion potential of the cladding layer gradually moved in the positive direction and then in the negative direction and the corrosion current density firstly decreased and then slightly increased. Adding Ti element to the CoCrFeNi alloy system will cause deterioration of the forming quality of the cladding layer. The addition of Ti element can promote the formation of body-centered cubic (BCC) phase, and play the role of grain refinement, effectively improving the microhardness and corrosion resistance of the cladding layer. |
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