研究目的
To study microstructure and properties of coating, furthermore, the formation mechanism and distribution rule of ceramic reinforcements are investigated, which are critical factors for determining the performance of coating.
研究成果
The composite coating was produced by laser cladding on Q235 mild steel and bonded with substrate by metallurgical bonding without cracks. The coating was composed of Ni3Ti, Cr2Ti, Ni–Cr–Ti, TiB2 and TiC. The ceramic reinforcements in the coating were TiB2 and TiC rather than B4C. The ceramic reinforcements had two existing states of egg-type eutectic and independent structures in coating. Owing to the high hardness ceramic reinforcements and IMC, the micro-hardness of coating was about 5 times as high as that of substrate. The wear resistance of coating was obviously better than that of substrate.
研究不足
The technical and application constraints of the experiments, as well as potential areas for optimization.
1：Experimental Design and Method Selection:
Laser cladding was performed on TruDisk12003 disc type solid-state laser equipment. Mixed powder was put into drying oven at 100°C for 2 h to remove the bound water. Q235 hot rolled mild steel was used as substrates.
2：Sample Selection and Data Sources:
Q235 mild steel of cuboid sample with size of 40 mm × 20 mm × 10 mm was used as substrates.
3：List of Experimental Equipment and Materials:
TruDisk12003 disc type solid-state laser equipment, planetary ball mill, drying oven, sand papers, alcohol, ultrasonic cleaning machine.
4：Experimental Procedures and Operational Workflow:
Laser cladding was performed with specific technological parameters (laser power, scanning speed, laser beam diameter).
5：Data Analysis Methods:
Phase compositions were studied with the help of X-ray diffraction (XRD), cross-section morphology was observed by scanning electron microscope (SEM) with energy dispersive spectrometer (EDS).
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TruDisk12003 disc type solid-state laser equipment
TruDisk12003
TRUMPF Co.
Used for laser cladding process.
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planetary ball mill
Used for blending composite powder particles.
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drying oven
Used to remove the bound water from mixed powder and dry the substrate.
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sand papers
Used to remove rust from the substrate.
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alcohol
Used to clean the substrate.
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ultrasonic cleaning machine
Used to clean the substrate.
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X-ray diffraction (XRD)
Used to study phase compositions.
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scanning electron microscope (SEM)
Used to observe cross-section morphology.
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energy dispersive spectrometer (EDS)
Used for chemical elements analysis.
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Vickers micro-hardness tester
HXS-1000A
Used to test the micro-hardness of the coating.
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dry sliding wear testing machine
ML-10
Used to measure the wear resistance of substrate and coating.
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