Creep damage evaluation of Mod. 9Cr-1Mo steel by an electromagnetic nondestructive method focused on rapid magnetization process

Shibuya, Kentaro*; Uchimoto, Tetsuya*; Takagi, Toshiyuki*; Takaya, Shigeru

no journal, , 

Magnetic property of aged samples and creep rupture samples of mod. 9Cr-1Mo steel were measured by a nonlinear eddy current method and a magnetic Kerr effect method. Concerning the creep rupture samples, it was found that the equivalent remanent magnetization measured by the nonlinear eddy current method and that measured by the magnetic Kerr effect method are different. This difference may be introduced by change in precipitation of MX carbonnitride and dislocation.