6Purbolaksono J, Ahmad J, Beng L C, et al. Failure analysis on aprimary super heater tube of a power plant[ J]. Engineering FailureAnalysis, 2010,17( 1) ; 158 - 167.
7Li N,Yan W P, Ye F,et al. Creep - fatigue interaction life predic-tion for P91 steel based on improved Elman neural network model[J ]. Advanced Materials Research, 2012 ( 535 - 537 ) : 674-677.
8Gandy D. The grades 11 and 12 low alloy steel handbook [ M ].California . Electeric Power Research Institute,2007.