【摘要】 通过空蚀试验和扫描电镜分析对空蚀试样的破坏过程进行了研究,进行了微观点跟踪观察。结果表明:在金属表面产生空蚀针孔,在随后大量气泡溃灭作用下,针孔壁逐渐小块剥落,形成空蚀坑,当空蚀坑相互连接时,原始表面全部剥落,新的空蚀针孔和空蚀坑又重新形成,使金属表面层层剥落。确定单个气泡溃灭产生的微射流是在金属表面造成空蚀针孔的原因,而空蚀坑的形成则是疲劳裂纹萌生和扩展的结果。更多还原

【Abstract】 By long gterms of cavitation test and a great amount of microanalysis with SEM, the destroyng course of samples under cavitation testing was studied. According to the changing course of the micro-appearance of samples, the damaging course of cavitation erosion is determined. First cavition-pinholes appear on the sample surface. Then the small pieces peel off from pinhole walls and pinholes develop into cavitation pits. After cavitation pits cover all the surface of samples, the previous surface peels off from the new surface repeatedly. It is confirmed that the cavitation pinholes are formed with the micro-liquid jet produced by bubble collapse. The cavitation pits are the results of initiation and growth of fatigue cracks.更多还原