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Matsumoto, Takanori*; Uchimoto, Tetsuya*; Takagi, Toshiyuki*; Takaya, Shigeru
no journal, ,
Mod. 9Cr-1Mo steel is used in advanced fossil power plants. It becomes more important to manage creep damage because temperature and pressure in operating conditions become higher. In this study, it is an objective to evaluate microstructure change due to creep damage by nonlinear eddy current testing. Firstly, relationship between signal of nonlinear eddy current testing and microstructure of creep test samples of mod. 9Cr-1Mo steel was investigated. Next, nonlinear electro-magnetic analysis was performed by using FEM, and then models describe the relation between microstructure and magnetic property was discussed. As result, the possibility of quantitative evaluation of microstructure change due to creep damage by the proposed method is shown.
Matsumoto, Takanori*; Uchimoto, Tetsuya*; Takagi, Toshiyuki*; Takaya, Shigeru
no journal, ,
The aim of this study is to evaluate microstructure change by creep damage of mod. 9Cr-1Mo steels using electromagnetic nondestructive evaluation. For the purpose, AC magnetization curves of isothermal aging specimens are discussed. Through the comparison between experimental and numerical results, equivalent conductivity and relative permeability are evaluated, and the relationship between microstructure and magnetic properties is discussed.