微米级X-ray断层扫描技术在TiAl铸件无损检测中的应用  

The application of micron level X-ray tomography in non-destructive test of Ti Al casting

作　　者：楼江燕[1] 楼华山[2] 

机构地区：[1]广西科技大学汽车工程学院,广西柳州545006 [2]柳州职业技术学院,广西柳州545006

出　　处：《广西科技大学学报》2015年第2期60-63,82,共5页Journal of Guangxi University of Science and Technology

基　　金：广西工学院博士基金(院科博09305);广西自然科学基金(2011GXNSFA018033)资助

摘　　要：研究采用MU2000 X射线仪对Ti6Al4V合金的铸造工艺进行了研究.通过逐级放大倍率法对Ti6Al4V合金铸件的内部进行微观检测,X射线断层成像图片表明:铸件内部大部分区域呈现灰色,该灰色部位代表着铸件致密的结构,证明浇注工艺及型壳结构设计的合理性;同时,还观察到铸件内部存在气孔、缩孔和熔接痕缺陷.经分析认为:浇注温度、型壳预热温度偏低是导致产生气孔、缩孔缺陷的主要原因,而熔接痕缺陷则与浇注系统设计的不合理相关.This study focuses on the casting process of Ti6Al4V alloy by means of MU2000 X-ray apparatus. The microcosmic detection for the inside of Ti6Al4V alloy casting was done by using of the method of magnification by degrees. The X-ray tomography shows that much of the inner region of casting appears gray. The gray area represents the dense microstructure of casting. It suggests that the casting process and the design of shell structure are reasonable. Defects like gas holes, shrinkage cavities and weld marks are also found in the inner region of casting at the same time. It is considered through analysis that the pouring temperature of Ti6Al4V alloy liquid and the preheating temperature of shell are lower than optimum is the main reason causing gas holes and shrinkage cavities, while the weld marks are related to the irrational design of casing system.

关 键 词：微米级-X射线断层检测 断层成像照片 图像增强器 铸件 

分 类 号：TH14[一般工业技术—材料科学与工程]