| MA Yong,ZHU Hong-mei,SUN Chu-guang,LIAO Bang-liang,SHEN Long-zhang,HE Bin,ZHU Wei-hua,WANG Xin-lin.Microstructure and Properties of Y2O3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy[J],46(6):238-243 |
| Microstructure and Properties of Y2O3-doped Laser Cladded Composite Coating on TC4 Titanium Alloy |
| Received:January 23, 2017 Revised:June 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.06.038 |
| KeyWord:TC4 titanium alloy laser cladding composite coating microstructure microhardness wear resistance |
| Author | Institution |
| MA Yong |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| ZHU Hong-mei |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| SUN Chu-guang |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| LIAO Bang-liang |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| SHEN Long-zhang |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| HE Bin |
a.School of Mechanical Engineering, University of South China, Hengyang , China |
| ZHU Wei-hua |
b.School of Electrical Engineering, University of South China, Hengyang , China |
| WANG Xin-lin |
a.School of Mechanical Engineering, b.School of Electrical Engineering, University of South China, Hengyang , China |
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| Abstract: |
| The work aims to improve wear resistance of TC4 titanium alloy. Pasty mixed powder was prepared at a proper ratio of TiB2:TiC (1:3) and adding Y2O3 rare earth oxide in different mass fractions. Wear resistant composite coating was prepared by laser cladding Y2O3-doped TiB2 and TiC powder on the surface of TC4 titanium alloy using 5 kW continuous wave CO2 laser. Microstructure and composition of the laser cladding layers were analyzed with scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD); microhardness of the laser cladding layer was measured with Vickers hardness tester; and wear resistance was tested with universal friction and wear tester. After 4% Y2O3 was added, grain size of the middle structure was greatly refined; microstructure of the bonding zone was transformed from compact structure to reticular whisker structure; maximum microhardness of the cladding layer was 1404.6HV0.2, 3.7 times as high as that of TC4 substrate; wear loss of the cladding layer decreased by 66.67%, and the friction coefficient decreased remarkably. Wear resistance of the laser cladded TiC/TiB composite cladding coating on the surface of TC4 titanium alloy can be improved significantly by adding 4% Y2O3. |
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