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윤기봉(K.B.Yoon),마영화(Y.W.Ma),김영일(Y.I.Kim),차석주(S.J.Cha),김윤재(Y.J.Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper the causes and mechanisms of the failure of gas turbine compressor blades were analyzed with finite element analysis and surface inspection. An approximate remaining life assessment was performed by deterministic assessment methods based on the results of fatigue crack growth tests and collected mechanical properties data
이해무,윤기봉,남승훈,소철호 ( H . M . Lee,K . B . Yoon,S . H . Nahm,C . H . Soh ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
As Cr-Mo-V steels have excellent mechanical and creep properties at elevated temperatures, they are extensively used in power plants. However, the steam turbine components are supposed to have suffered material degradation during long-term service at elevated tenperatures. Many efforts have been made to assess the safety and residual life of these components by means of non-destructive methods such as plastic replication, hardness and electric resistance techniques. Recently, a parameter correlating hardness changes during long-term heating to those during creep was introduced and it was named `G parameter`. The electric resistivity as well as hardness are affected by damage accumulation, but there have been no efforts to correlate G parameter to resistivity changes. In this study, relationship between G parameter and changes in electric resistivity was investigated using artificially aged Cr-Mo-V steel. It is well understood that G parameter can be applied to electric resistance techmique.