张桃,刘海霞,康灿,李秀阁.铅黄铜合金在不同液体介质中的超声空蚀行为及机理[J].表面技术,2018,47(1):109-115.
ZHANG Tao,LIU Hai-xia,KANG Can,LI Xiu-ge.Ultrasonic Cavitation Erosion Behavior and Mechanism of Pb-Brass Alloy in Different Liquids[J].Surface Technology,2018,47(1):109-115 |
| 铅黄铜合金在不同液体介质中的超声空蚀行为及机理 |
| Ultrasonic Cavitation Erosion Behavior and Mechanism of Pb-Brass Alloy in Different Liquids |
| 投稿时间：2017-07-20 修订日期：2018-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.017 |
| 中文关键词: 超声空蚀 液体介质 铅黄铜合金 表面形貌 加工硬化 |
| 英文关键词:ultrasonic cavitation liquid medium Pb-brass alloy surface morphology work hardening |
| 基金项目:国家自然科学基金（51376081） |
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| Author | Institution |
| ZHANG Tao | a.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
| LIU Hai-xia | a.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
| KANG Can | b.School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China |
| LI Xiu-ge | a.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China |
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| 中文摘要: |
| 目的 探讨铅黄铜合金在不同液体介质中的超声空蚀行为及机理。方法 利用超声波振动空蚀装置，分别研究铅黄铜材料在去离子水、自来水以及3.5%NaCl溶液中的超声空蚀行为，借助金相显微镜、体视显微镜、扫描电子显微镜以及显微硬度计检测空蚀后的材料表面参数。结果 经过300 min空蚀作用后，铅黄铜试样在自来水中的累计质量损失最大，在3.5%NaCl溶液中的累计质量损失最小，在去离子水中的累计质量损失居中。铅黄铜在去离子水和自来水中空蚀初期主要表现为大量的塑性变形，裂纹在晶界处萌生并沿横向和纵向不断扩展，蚀坑细小且形状不规则。在3.5%NaCl溶液中，铅黄铜空蚀初期的塑性变形和裂纹发展不明显，但有明显的选择性空蚀倾向，蚀坑形状以唇状为主，蚀坑口径更大，深度更深。铅黄铜在3种液体介质中空蚀后都产生了几百微米的加工硬化层，其中，在3.5%NaCl溶液中空蚀后的硬化层最厚，最大硬度值增幅达13.6%。随着空蚀时间的延长，材料近表层逐渐软化。结论 铅黄铜在3种液体介质中的抗空蚀性能高低顺序为3.5%NaCl溶液＞去离子水＞自来水。 |
| 英文摘要: |
| 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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