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| Study on Surface of Nickel Base Superalloy Strengthened by Coupled Ultrasonic and Electric Pulse With Water-in-Oil Working Fluid |
| JIN Hui, JI Renjie, WANG Baokun, LIU Yonghong |
| China University of Petroleum (East China), Qingdao 266580, China |
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Abstract In this paper, a new type of water-in-oil (W/O) emulsion suitable for coupling electrical pulse and ultrasonic treatment was developed, and the influence of water content on the viscosity and conductivity of the W/O emulsion was explored. It is found that when the water content is 40% and below, the W/O emulsion can maintain low electrical conductivity, have excellent dielectric properties, and better flow properties. Inconel 718 alloy was treated with water, W/O emulsion with mass fraction of 20% and 40%, and the surface morphology, wear resistance and corrosion resistance after treatment were investigated. The results showed that the surface of the sample treated with W/O emulsion with mass fraction of 40% is the smoothest, and has the best wear resistance and corrosion resistance. Compared with the substrate, the friction coefficient is reduced by 0.267, the wear loss is reduced by 43.2%, the corrosion current density is reduced by 86.9%, and the impedance is increased by 45.4%. The W/O emulsion can effectively fill the gap between the carbon brush and the sample, avoid the occurrence of discharge phenomenon. At the same time, the W/O emulsion can provide excellent lubrication effect, which can weaken the friction between ultrasonic vibration head and sample surface, and finally obtains better surface quality.
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2022, 
