为解决采用预埋管成型的某航空发动机铝合金机匣管路密封性试验时出现的渗漏问题，分别通过高、低倍组织观察和 X 射线实时成像技术 (DR) 分析了该渗漏问题产生的机理，并制定了解决措施。 通过组织和工艺特征分析，明确了渗漏由预埋不锈钢管与铝基体之间存在的间隙及铝基体自身存在的冶金缺陷共同导致，然而受制于当前 X 射线检测能力，该冶金缺陷无法通过常规无损检测识别。 最后，针对该渗漏问题，通过铸造工艺方案优化，解决了该机匣管路的渗漏问题。

 To solve the leakage problem during the sealing test of an aero-engine aluminum alloy casing formed by an embedded pipe, the mechanism of the leakage was analysed by micro/macro structure observation and digital X-ray real-time imaging (DR) technology, and then the solution measures were formulated. With the analysis of the structure and process characteristics, it is clear that the leakage is caused by the gap between the embedded stainless steel tube and the aluminum matrix and the metallurgical defects of the aluminum matrix. However, limited by the X-ray detection capability, this metallurgical defect cannot be identified by conventional nondestructive testing. Finally, the optimization of the casting process has been taken to solve the leakage problem of the casing.