한국태양에너지학회:학술대회논문집

The Korean Solar Energy Society (한국태양에너지학회)
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The Evaluation of the Stress Corrosion Cracking for Improvement of Reliability in Turbine Operation and Maintenance

터빈 운전 신뢰성 향상을 위한 응력부식균열 평가

  • Kang, Yong-Ho (Dept. of Mechanical Engineering, Graduate School, Changwon National University) ;
  • Song, Jung-Il (Dept. of Mechanical Engineering, Changwon National University)
  • 강용호 (창원대학교 기계공학과 대학원) ;
  • 송정일 (창원대학교 메카트로닉공학부 기계공학)
  • Published : 2008.11.14
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Abstract

In case of low pressure steam turbine used in power plant, it was operated in wet steam and high stress condition. Therefore, it is possible that the corrosion damage of low pressure was induced by this condition. According to previous study, about 30% of total blade failure correspond to corrosion fatigue or SCC(stress corrosion cracking) in low pressure turbine. Especially, LSB(last stage bucket) of low pressure turbine has a higher hardness to prevent erosion damage due to water droplet however, generally this is more dangerous for SCC damage. Therefore, to improve reliability of turbine blade. various methods for SCC evaluation has been developed. In this study, the crack found in LSB during in-service inspection was evaluated using microstructure analysis and stress analysis. From the stress analysis, the optimum size of fillet to remove the crack was proposed. And also, the reliability was evaluated for modified LSB using GOODMAN diagram.

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