Cold neutron radiography testing of residual core in hollow turbine blade based on gadolinium doping method
-
摘要: 针对航空发动机DD5单晶高温合金空心叶片，采用钆掺杂法设计制作了阶梯状模拟试样和叶片对比试样，使用冷中子源和单面乳化胶片的成像方式，研究了Gd2O3示踪剂含量为3%时残芯的检测灵敏度，分析了灵敏度、透照厚度和残芯厚度之间的定量关系以及叶片结构对检测结果的影响。试验结果表明，采用单面乳化胶片的冷中子照相检测的空间分辨力达到50 μm；随着透照厚度的减小及残芯厚度的增加，残芯检测灵敏度逐渐增加，且复杂曲率的叶片结构将一定程度地降低检测灵敏度。该结果为空心涡轮叶片的实际检测提供了参考，同时证明了冷中子照相检测具有良好的适用性，可实现残芯的高灵敏度检测。Abstract: For DD5 single crystal superalloy blade of the Aeroengine, the stepped reference sample and blade reference samples were designed and prepared by gadolinium doping method. Using cold neutron source and imaging method of single-emulsion industry film, the detection sensitivity of residual core with Gd2O3 tracer content of 3% was studied. The quantitative relation among sensitivity, transmission thickness and residual core thickness, as well as the influence of blade structure on detection results were analyzed. The results show that the spatial resolution of the combination of cold neutron source and single-emulsion film is up to 50 μm. With the decrease of transmission thickness and the increase of residual core thickness, the detection sensitivity of residual core increases gradually. The results provide a reference for the practical application of hollow turbine blade, proves that the cold neutron photography testing has good applicability, which can achieve the high detection sensitivity of residual core.
-
Keywords:
- residual core /
- doping method /
- cold neutron /
- single-emulsion film
-
-
[1] 陈荣章. 航空铸造涡轮叶片合金和工艺发展的回顾与展望[J]. 航空制造技术, 2002(2):19-23. [2] 曹腊梅, 汤鑫, 张勇, 等. 先进高温合金近净形熔模精密铸造技术进展[J]. 航空材料学报, 2006, 26(3):238-243. [3] KRUGLOV E P, KOCHETOVA G K. Improvement of a technological process for ceramic core removal out of internal cavities of aircraft GTE turbine blade castings[J]. Russian Aeronautics, 2007, 50(2):227-229.
[4] 王婵, 李泽, 罗辅全, 等. 涡轮叶片内腔滞留物射线检测[C]//陕西省机械工程学会. 陕西省第十届无损检测年会论文集. 西安:陕西省机械工程学会, 2006:90-136. [5] 郭广平, 凌海军, 刘庆珍, 等. 空心叶片残留型芯影像的射线照相对比度[J]. 无损检测, 2009, 31(7):544-547. [6] CHEUL M S, YI K K, TAEJOO K, et al. Detection of hidden shot balls in a gas-cooled turbine blade with an NRT gadolinium tagging method[J]. Nuclear Instruments and Methods in Physics Research A, 2009, 605(1/2):175-178.
[7] HAROLD B. Advances in neutron radiographic techniques and applications:a method for nondestructive testing[J]. Applied Radiation and Isotopes, 2004, 61(4):437-442.
[8] CHIA W M, CHUANG C Y, CHEN C S, et al. Case studies of neutron radiography examination at INER[J]. Nuclear Instruments and Methods in Physics Research A, 1996, 377(1):16-19.
[9] FODERARO A. The elements of neutron interaction theory[M].Cambridge Mass:The MIT Press,1971.
[10] 杨芬芬. 空心叶片内部微量残芯的检测方法及工艺[D]. 哈尔滨:哈尔滨工业大学, 2011.
计量
- 文章访问数: 19
- HTML全文浏览量: 0
- PDF下载量: 3
下载:
