Microstructure and properties of NiCrBSi coating formed by ultrasonic vibration combined with induction cladding

Abstract

A new method of ultrasonic vibration combined with induction cladding was used to prepare nickel-based alloy coating on 45 steel to improve the properties of NiCrBSi coating by induction cladding. The temperature field distribution was simulated and analyzed by finite element method, and the optimum process parameters were determined. The transmission mechanism of ultrasonic wave in traditional non-contact ultrasonic vibration composite cladding was revealed. The effects of non-contact and contact ultrasonic vibration on the grain size, element distribution, porosity, and microhardness of the coating were studied. The cross-section of the coating was analyzed by using a scanning electron microscope, energy dispersive spectrometer, and microhardness tester. The results show that the properties of the coating prepared by non-contact ultrasonic vibration combined with induction cladding were not improved because most of the ultrasonic energy was emitted. In contact ultrasonic vibration combined induction cladding, dendrite structure was destroyed, and the coating grains were refined under the action of ultrasonic vibration. The porosity also decreased evidently under the action of ultrasonic cavitation effect. The microhardness of the coating top area been significantly improved in the microhardness test.