Detecting Internal Hot Corrosion of In-service Turbine Blades Using Neutron Tomography with Gd Tagging

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• 作者：Cheul Muu Sim (1)
  Hwa Suk Oh (1)
  Tae Joo Kim (1)
  Yoon Sang Lee (1)
  Yi Kyung Kim (2)
  Seung Seob Kwak (3)
  Young Ha Hwang (4)
  
• 关键词：Neutron tomography ; Gadolinium tagging ; In ; service turbine blade ; Air channel ; Internal hot corrosion
• 刊名：Journal of Nondestructive Evaluation
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：33
• 期：4
• 页码：493-503
• 全文大小：11,266 KB
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• 作者单位：Cheul Muu Sim (1)
  Hwa Suk Oh (1)
  Tae Joo Kim (1)
  Yoon Sang Lee (1)
  Yi Kyung Kim (2)
  Seung Seob Kwak (3)
  Young Ha Hwang (4)
  
  1. Korea Atomic Energy Research Institute, 150, Deokjin-dong, Yuseong-gu, Daejeon?, 305-353, Korea
  2. Radpharm Ltd., 1045 Daedeokdaero, Yuseong-gu, Daejeon?, 303-353, Korea
  3. NAWOO TECH Ltd., Kranz Techno#304,?5442-1, Sangdaewon-Dong, Seongnam?, 462-120, Korea
  4. Aero Technical Research Institute, 701-799 Gumsa-dong, Dong-gu, Daegu?, 304-160, Korea
  
• ISSN：1573-4862

文摘

Neutron tomography with Gd tagging has been developed for application to in-service turbine blades to ensure theirs maintainability. Hot corrosion was detected in the air channels of 13?% of in-service blades. Hot corrosion occurs in clusters of about 15?mm in diameter. The size of individual hot corrosion features was determined to be in the range of 0.8-.81?mm by neutron tomography. Turbine blades with indications of flaws were crosscut with a wire for internal verification. Scanning electron microscopy revealed that hot corrosion occurs in scattered groups with multiple pits of about 150 \(\upmu \) m in size in the channels. The analyzed oxygen content of the corroded surface was over 30?wt% higher when compared with new turbine blades by energy dispersive X-ray spectroscopy. These findings may play a pivotal role in curtailing in-service turbine blade failure due to internal corrosion of cooling channels. Applying these results with neutron tomography on in-service turbine blades can lead to more reliable determinations of condemnation.