弹簧扁钢内部缺陷的分层超声C扫描成像技术研究  

Layer Scanning Imagery Technology on Inner Defects of Spring Flat Steel

作　　者：陈振华[1,2] 郭文光[1] 章庆 李红卫 卢超[1] 

机构地区：[1]无损检测技术教育部重点实验室(南昌航空大学),南昌330063 [2]方大特钢科技股份有限公司,南昌330012

出　　处：《失效分析与预防》2015年第6期339-345,共7页Failure Analysis and Prevention

基　　金：国家自然科学基金(11104129);2015年江西省博士后科研项目(2015KY01)

摘　　要：对弹簧扁钢的全厚度范围进行C扫描成像检测时,需以一定间隔调整焦点位置以确保检测精度。本研究测量了聚焦声束焦柱高度并分析其对C扫描图像的影响,提出了应用于弹簧扁钢全厚度C扫描成像检测的焦距调整法则。此外,通过分析C扫描图像的特征区域确定缺陷边界,并通过金相试验对其进行了验证。研究结果显示:根据焦柱高度确定焦距调整间隔可在提高检测效率的同时保证较高的检测精度,所提出的缺陷图像特征边界可用于精确测量缺陷尺寸;水浸聚焦超声C扫描成像方法可用于评价弹簧扁钢内部缺陷的尺寸及其分布。When the ultrasonic C-scan image is adopted for full thickness range testing of spring flat steel, focus position must be adjusted with regular interval to keep better testing accuracy. In the research, the height of focusing column is measured and its influences to the C scan imaging are analyzed. And then, the adjusting law of focusing position for C scan imaging is proposed. Besides, the characteristic area of scanning imagery is analysis to decide the defects boundary and which is verified by metallographic test. The results indicate both higher testing accuracy and testing efficiency can be obtained by setting a proper focusing interval according to the height of focusing column, and the boundary of defect imagery proposed in the paper can he used to measure the defect＇ s dimension. Therefore, utrasonic water immersion focusing method can be used to evaluate the dimension and distribution of inner defects in spring fiat steel.

关 键 词：弹簧扁钢 C扫描成像 金相试验 缺陷 

分 类 号：TG115.285[金属学及工艺—物理冶金]