| SU Ke-qiang,LI Yu-xin,ZHANG Peng-fei,WU Li-yun,ZHANG Hong-jian,YU Li-qiang,LI Xin-chen,ZHENG Bo-fang.TiBCN Coatings Prepared on Ti6Al4V Surface by Laser Cladding[J],47(12):142-148 |
| TiBCN Coatings Prepared on Ti6Al4V Surface by Laser Cladding |
| Received:June 05, 2018 Revised:December 20, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.020 |
| KeyWord:laser cladding laser specific energy Ti6Al4V Ti/TiBCN coating microstructure microhardness corrosion re-sistance wear resistanc |
| Author | Institution |
| SU Ke-qiang |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| LI Yu-xin |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| ZHANG Peng-fei |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| WU Li-yun |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| ZHANG Hong-jian |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| YU Li-qiang |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| LI Xin-chen |
School of Material Science and Engineering, North University of China, Taiyuan , China |
| ZHENG Bo-fang |
School of Material Science and Engineering, North University of China, Taiyuan , China |
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| Abstract: |
| The work aims to improve Ti6Al4V surface hardness, corrosion resistance and wear resistance. Ti/TiBCN composite coatings were prepared on the surface of Ti6Al4V by laser cladding technique. The effect of different laser specific energy on the microstructure and properties of the coatings was investigated. The phase composition, microstructure, microhardness, corrosion resistance and wear resistance of the coatings were investigated by X-ray diffractometer, scanning electron microscope (SEM), micro Vickers hardness tester, electrochemical workstation and reciprocating friction and wear tester. When the laser specific energy was 13.3 kJ/cm2 and the content of TiBCN was 70%, the quality of Ti/TiBCN composite coating was the best. The upper part of the coating consisted of cellular crystal, petal structure, whisker structure and equiaxed α phase. The middle part of the coating was mainly composed of coarse TiBCN dendrite, while the lower part of the coating was comprised of needle-like structure and spherical TiBCN particles. Compared with Ti6Al4V substrate, the hardness of the coating was 1050HV0.2, which was about 3.0 times of that of the substrate (340HV0.2). The self-corrosion potential of the substrate was -1.388 V and the self-corrosion current density was -6.33 A/cm2, while the self-corrosion potential of the coating was -1.173 V and the self-corrosion current density was -6.22 A/cm2. In the friction and wear experiments, the coating appeared slight spalling, the abrasive wear type was shallow and short wear mark and particle debris and the substrate surface appeared more ploughing wear. The average friction coefficient of the coating was 0.174, which was about 1/2 of that of the substrate (0.323). The wear loss of the coating was 1.152 mg, which was about 1/6 of the substrate (6.723 mg). When the laser specific energy is 13.3 kJ/cm2, the microstructure of the coating is uniform and compact, the hardness is improved significantly and the corrosion resistance and wear resistance of the coating are better than that of the substrate. |
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