Relationship between the geometric features of carbon steel cavitation erosion debris and the cavitation erosion stages  

作　　者：LIU ShiHan CHEN DaRong 

机构地区：[1]State Key Laboratory ofTribology, Tsinghua University, Beij'ing 100084, China [2]The First Aviation College of the Air Force, PLA, Xinyang 464000, China

出　　处：《Chinese Science Bulletin》2010年第7期670-676,共7页

基　　金：supported by the National Basic Research Program of China(Grant No.2007CB707702);Key Project of State Key Laboratory of Tribology of China

摘　　要：The debris produced in vibration cavitation tests of three kinds of carbon steel were collected.Their geometric features were analyzed quantitatively and observed respectively by a profilometer and a scanning electronic microscope(SEM) with reference to the investigation of the cavitation damaged surface by SEM and X-ray diffraction(XRD) .It was found that among the debris produced in all cavitation erosion stages,more than 45%were platelets because of the occurrence of dislocation and cleavage fracture,and only less than 25%were strands.The number of granule was small in the first cavitation erosion stage and increased rapidly to the number comparable with that of platelets in the next stage,and then reduced in the third stage.The sphericity values of the debris varied in accordance with the stages of cavitation damage,which were 0.3―0.4 in the incubation stage,0.5―0.7 in the acceleration stage and not less than 0.5 in the maximum rate stage,although a slight decrease occurred in the third stage.The debris produced in vibration cavitation tests of three kinds of carbon steel were collected. Their geometric features were ana- lyzed quantitatively and observed respectively by a profilometer and a scanning electronic microscope （SEM） with reference to the investigation of the cavitation damaged surface by SEM and X-ray diffraction （XRD）. It was found that among the debris produced in all cavitation erosion stages, more than 45% were platelets because of the occurrence of dislocation and eleavage fracture, and only less than 25% were strands. The number of granule was small in the first cavitation erosion stage and increased rapidly to the number comparable with that of platelets in the next stage, mad then reduced in the third stage. The sphericity values of the debris varied in accordance with the stages of cavitation damage, which were 0.3--0.4 in the incubation stage, 0.5--0.7 in the acceleration stage and not less than 0.5 in the maximum rate stage, although a slight decrease occurred in the third stage.

关 键 词：几何特征 碳素钢 空蚀 扫描电子显微镜 X射线衍射仪 扫描电镜 血小板数 振动试验 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TP391.41[金属学及工艺—金属材料]