空化水射流冲蚀纯铜的表面空蚀损伤

发布时间：2018-05-01 06:40

本文选题：空化水射流 + 空蚀　；参考：《机械工程材料》2017年05期

【摘要】：利用自制空化水射流设备对纯铜进行了不同时间的冲蚀,研究了冲蚀后试样的显微组织、损伤形貌、表面粗糙度以及截面硬度,分析了空蚀损伤过程及机制。结果表明:一次射流区空蚀坑底部晶粒弯曲变形,而混合射流区的截面组织无明显变化;一次射流区在水射流冲蚀5min时,表面就已经出现空蚀坑、空蚀针孔,随冲蚀时间的延长,空蚀坑和空蚀针孔数量增多,晶粒形貌逐步显现,同时出现大量的变形滑移带和金属剥落现象;混合射流区的空蚀坑大而浅,且随着时间的延长整个晶粒形貌全部显现;空蚀坑是以空蚀针孔聚集导致少量金属剥落这种形式长大的;随冲蚀时间的延长,两区的表面粗糙度逐渐上升,且混合射流区的表面粗糙度大于一次射流区的,其硬化层厚度和近表层硬度也相对较大。
[Abstract]:The cavitation water jet equipment was used to erode pure copper at different time. The microstructure, damage morphology, surface roughness and cross section hardness of the samples after erosion were studied. The cavitation damage process and mechanism were analyzed. The results show that the grain at the bottom of the cavitation pit in the primary jet zone is bent and deformed, but the cross section of the mixed jet zone has no obvious change, while the cavitation pit and the cavitation hole appear on the surface of the primary jet zone when the water jet erodes the 5min. With the extension of erosion time, the number of cavitation pits and cavitation holes increases, the grain morphology gradually appears, at the same time, a large number of deformation slip bands and metal denudation occur, and the cavitation pits in the mixed jet zone are large and shallow. With the extension of time, the grain morphology of the whole grain appears completely, and the cavitation pits grow up in the form of a small amount of metal denudation caused by the accumulation of cavitation holes, and the surface roughness of the two zones increases gradually with the extension of the erosion time. The surface roughness of the mixed jet zone is larger than that of the primary jet zone, and the hardening layer thickness and the near surface hardness are also relatively large.
【作者单位】：大连交通大学材料科学与工程学院;
【基金】：辽宁省教育厅科学研究一般项目(L2015094)
【分类号】：TG146.11

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