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| Effects of TiC content on microstructures and properties of laser cladding Inconel 718 composite coatings |
| LU Shengru, TONG Yonggang, HU Yongle, WU Pengfei, JI Xixi, WANG Kaiming |
| College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China |
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Abstract In order to improve the high-temperature wear resistance of nickel-base alloy cladding, this paper employs laser cladding technology to prepare TiC reinforced Inconel 718 composite cladding layers, and investigats the effects of TiC content on the microstructures and high-temperature friction behaviour of Inconel 718 composite cladding layer by scanning electron microscope, energy spectrometer, super depth of field microscope, and ball-disc high temperature friction and wear test machine. The results show that the addition of TiC results in the formation of (Nb,Ti)C, NbC, and different scale TiC particles, the grains of the composite cladding layers are refined. The composite cladding layer with w(TiC)=30% has the highest hardness (HV0.2) of 660.0, which is 150.0% higher than that of the Inconel 718 cladding layer (264.0); at room temperature, the volume loss of the composite cladding layer is 93.4% lower than that of the Inconel 718 cladding layer; and at high temperature, the composite cladding layer still has excellent wear resistance with a volume loss of 0.83×108 μm3. The wear mechanism of cladding layers change from abrasive wear to adhesive wear with the increace of TiC content. The improvement in hardness and room and high temperature wear resistance of the cladding layers is attributed to the formation of different scale carbide-reinforced phases and grain refinement.
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Received: 30 August 2024
Published: 08 April 2025
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2025, Vol. 30 
