| ZHANG Tao,LIU Hai-xia,KANG Can,LI Xiu-ge.Ultrasonic Cavitation Erosion Behavior and Mechanism of Pb-Brass Alloy in Different Liquids[J],47(1):109-115 |
| Ultrasonic Cavitation Erosion Behavior and Mechanism of Pb-Brass Alloy in Different Liquids |
| Received:July 20, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.017 |
| KeyWord:ultrasonic cavitation liquid medium Pb-brass alloy surface morphology work hardening |
| Author | Institution |
| ZHANG Tao |
a.School of Material Science and Engineering, Jiangsu University, Zhenjiang , China |
| LIU Hai-xia |
a.School of Material Science and Engineering, Jiangsu University, Zhenjiang , China |
| KANG Can |
b.School of Energy and Power Engineering, Jiangsu University, Zhenjiang , China |
| LI Xiu-ge |
a.School of Material Science and Engineering, Jiangsu University, Zhenjiang , China |
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| Abstract: |
| The work aims to explore ultrasonic cavitation erosion behavior and mechanism of Pb-Brass alloy in different liquid media. Ultrasonic cavitation erosion behavior of brass in deionized water, tap water and 3.5% NaCl solution was studied respectively with an ultrasonic vibration cavitation experimental rig. Surface parameters of eroded material were measured with metallographic microscope, stereomicroscope, scanning electron microscope and microhardness tester. After 300 min of cavitation erosion, the lead brass specimen had maximum cumulative mass loss in tap water, minimum cumulative mass loss in 3.5% NaCl solution, and intermediate cumulative mass loss in deionized water. In the initial stage, the cavitation erosion of Pb-brass mainly appeared as gross plastic deformation in deionized water and tap water. The cracks of the Pb-brass alloy appeared at grain boundary and then developed along the horizontal and vertical directions. Cavitation erosion pits were small and irregular. However, in the 3.5% NaCl solution, the cracks and plastic deformation developed slightly in early stage, but showed obvious tendency of selective cavitation erosion. The cavitation erosion pits were mainly lip-type, and of larger diameter and depth. The Pb-brass alloy produced hundreds of microns thick work-hardened layer subject to cavitation erosion in the three liquids. The hardened layer was the thickest in the 3.5% NaCl solution, and the maximum hardness increased by 13.6%. As cavitation erosion prolonged, material was gradually softened beneath the material surface. Cavitation resistance of the Pb-brass alloy in the three liquids, from high to low, is in the sequence of 3.5% NaCl solution, deionized water, tap water. |
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