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Microstructure and wear resistance of in-situ TiC reinforced Ti-based coating by laser cladding on TA15 titanium alloy surface |
Qiang AN1, Wenjun QI1,*( ), Xiaogang ZUO2 |
1 School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China 2 Xinjiang Joinworld Company Limited, Urumqi 830013, China |
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Abstract The TiC-reinforced Ti-based coating was prepared in-situ on the surface of the titanium alloy TA15 by laser cladding technology. The forming quality, microstructure, phase composition, hardness, and tribological properties were investigated by optical microscope, X-ray diffractometer, scanning electron microscope, energy spectrum analyzer, microhardness tester and friction and wear apparatus. The results show that the coating mainly composes of β-Ti, Co3Ti, CrTi4 and TiC, and the good metallurgical bond is formed between coating and the substrate. The microstructure of the coating bond zone is planar crystal and columnar crystal, the middle is dendritic, and the top is equiaxed. Significant differences in the morphology of TiC are observed in each micro-area of the coating. TiC of the top and middle areas is thick dendritic and petal-like, while TiC of the bonding area is needle-like and spherical. The maximum microhardness of the coating is 715HV, which is about 2.1 times than that of TA15 (330HV). Under the same conditions, the wear loss of coating is 30.14 mg, which is about 30.7% of TA15(98.11 mg). The wear mechanism of the cladding coating and substrate is a composite wear mode of adhesive wear and abrasive wear, but the wear degree of the coating is lighter.
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Received: 27 October 2020
Published: 18 April 2022
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Corresponding Authors:
Wenjun QI
E-mail: wenjuntsi@163.com
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Al | Zr | Mo | V | Si | Fe | C | Ti | 5.5-7.0 | 1.5-2.5 | 0.5-2.0 | 0.8-2.5 | 0.15 | 0.25 | 0.10 | Bal |
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Chemical compositions of TA15 substrate (mass fraction/%)
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Cross section (a) and longitudinal section (b) images of coatings
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SEM images of coatings (a)bottom and middle of coating; (b)top and middle of coating
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XRD pattern of coating
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Position | C | Al | Si | Ti | Cr | Co | Ni | Zr | Mo | W | V | 1 | 1.42 | 8.52 | 1.14 | 77.67 | 0.51 | 1.80 | 2.98 | 1.62 | 1.70 | 1.14 | 1.50 | 2 | 44.76 | 0 | 0.13 | 53.60 | 0.14 | 0 | 0.23 | 0.09 | 0 | 0.25 | 0.80 | 3 | 8.41 | 7.53 | 0.01 | 64.41 | 8.60 | 6.28 | 0.27 | 0.20 | 0.43 | 1.14 | 2.72 | 4 | 47.46 | 1.32 | 0.01 | 49.75 | 0.12 | 0.56 | 0 | 0.12 | 0.14 | 0.32 | 0.20 | 5 | 49.89 | 1.24 | 0.22 | 45.90 | 1.97 | 0 | 0.07 | 0.10 | 0 | 0.10 | 0.51 | 6 | 53.21 | 1.51 | 0.15 | 40.19 | 1.86 | 1.80 | 0.09 | 0.14 | 0.14 | 0.22 | 0.68 | 7 | 7.52 | 6.32 | 0.13 | 64.76 | 9.12 | 7.28 | 0.30 | 0.12 | 0.35 | 1.85 | 2.25 |
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EDS composition analysis of each test point in coating (atom fraction/%)
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Microhardness distribution curve of each zone in the coating (a) and metallographic morphology of some coating indentation (b)
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Friction coefficients of coating and substrate
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Worn morphologies of TA15 substrate (a) and coating (b)
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