Ultrasonic cavitation modification(UCM)employs cavitation effect to induce strong plastic deformation on the material surface and improve surface properties.To explore the surface strengthening and grain refinement of...Ultrasonic cavitation modification(UCM)employs cavitation effect to induce strong plastic deformation on the material surface and improve surface properties.To explore the surface strengthening and grain refinement of materials by UCM,the UCM orthogonal experiments of AZ31 B magnesium alloy were carried out in water and kerosene,respectively.The effects of ultrasonic amplitude,distance from the sample,and processing time on Vickers hardness and grain size of the material were studied.The results showed that the Vickers hardness of samples increased to1.5–3 times after UCM in water,which was 23.77–48.19%higher than that in kerosene.The metallographic observation indicated the grains on the surface of AZ31 B were refined after UCM.The maximum fluctuation of grain size on the material surface was not more than 10 lm after UCM in water,and most of them were concentrated between 1.5 lm and 2.5 lm,while the former was more than 40 lm and the latter were concentrated between 2 lm and 10 lm in kerosene.This reflected that the grain refinement effect of UCM in water was better than that in kerosene.Ultrasonic cavitation can be used as a benign means to improve the surface properties of materials.展开更多
基金the National Natural Science Foundation of China(Nos.52005455 and 51975540)Shanxi Province Science Foundation for Youths(Nos.201901D211205 and 201901D211201)+2 种基金the Coal Seam Gas Joint Foundation of Shaanxi Province(No.2015012018)the Opening Foundation of Shanxi Key Laboratory of Advanced Manufacturing Technology(No.XJZZ202002)the Science and Technology Innovation Project of Shanxi Colleges and Universities(No.2019L0592)。
文摘Ultrasonic cavitation modification(UCM)employs cavitation effect to induce strong plastic deformation on the material surface and improve surface properties.To explore the surface strengthening and grain refinement of materials by UCM,the UCM orthogonal experiments of AZ31 B magnesium alloy were carried out in water and kerosene,respectively.The effects of ultrasonic amplitude,distance from the sample,and processing time on Vickers hardness and grain size of the material were studied.The results showed that the Vickers hardness of samples increased to1.5–3 times after UCM in water,which was 23.77–48.19%higher than that in kerosene.The metallographic observation indicated the grains on the surface of AZ31 B were refined after UCM.The maximum fluctuation of grain size on the material surface was not more than 10 lm after UCM in water,and most of them were concentrated between 1.5 lm and 2.5 lm,while the former was more than 40 lm and the latter were concentrated between 2 lm and 10 lm in kerosene.This reflected that the grain refinement effect of UCM in water was better than that in kerosene.Ultrasonic cavitation can be used as a benign means to improve the surface properties of materials.
