Abstract
To enhance the service life of brake discs for rail transit vehicles, an experimental platform for ultrasonic-assisted laser cladding was established. Single-layer and multi-layer overlapping Fe-Ni-Ti coatings were prepared on the surface of 316L steel with and without ultrasonic assistance. The study investigated the influence of ultrasonic vibration on the microstructure and residual stress of composite coatings, and conducted tests on hardness, frictional wear, and corrosion resistance of the coatings. Results showed that ultrasonic vibration can refine grain structures.Under ultrasonic assistance, residual tensile and compressive stresses of the multi-layer cladding decreased by 12% and 13%, respectively. Under ultrasonic assistance, the average microhardness of single-pass samples increased to 515 HV, while the average microhardness of multi-pass overlapping samples increased to 460 HV. After adding ultrasonic vibration, the wear rate of single-layer samples decreased by 18.1%, and that of multi-layer samples decreased by 12.9%. Electrochemical impedance spectroscopy shows that under the action of ultrasound, the composite coating has better corrosion resistance performance.
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