加工方法和材料种类对空蚀结果的影响

利用旋转圆盘空蚀试验装置,以流动的自来水为介质,对铣削和抛光加工的1Cr18Ni9Ti、40Cr、45#钢3种钢材料,进行了累计5min、20min和1h的空蚀试验,利用扫描电子显微镜对试验后试样的表面形貌进行原位观察。结果表明同种材料,铣削和抛光的试样蚀坑形态不同;同种加工方法,1Cr18Ni9Ti最难发生空蚀,40Cr的空蚀现象明显,45#钢发生了严重的空蚀破坏。结果显示不同加工方法影响了试样表面微形貌和显微组织,从而得到形态不同的空蚀坑;材料种类对空蚀破坏程度有显著影响,硬度和润湿性可能是重要影响因素。

Effect of Processing Methods and Type of Materials on Cavitation Erosion

The cavitation erosion of 1Cr18Ni9Ti,40Cr and 45# steel samples treated by milling and polishing process were investigated by the self-made rotating disk test rig in tap water for 10 min,20 min and 1 h.The surface topography of the samples were observed in situ by SEM.Results show that for the same material,the shape of pits on the samples are different under different processing methods,which can be attributed to the diffent surface topography and microstructure.Treated by the same processing method,1Cr18Ni9Ti sample is nearly undamaged,while 40Cr sample damages evidently,and 45# sample damages worstly.Different hardness and water contact angles can have contribution to it.