Relationship between Dislocation Density in P91 Steel and Its Nonlinear Ultrasonic Parameter  

作　　者：Ye-qing CAI Jin-zhong SUN Cheng-jie LIU Shi-wei MA Xi-cheng WEI 

机构地区：[1]School of Materials Science and Engineering, Shanghai University [2]School of Mechatronics Engineering and Automation, Shanghai University

出　　处：《Journal of Iron and Steel Research International》2015年第11期1024-1030,共7页

基　　金：Item Sponsored by National Natural Science Foundation of China(61171145,11274226)

摘　　要：P91 steel is an important bearing material used in nuclear power plants. The study of its mechanical degradation behavior is important for ensuring safe operation. The relationship between the dislocation density of P91 steel under different strains and the corresponding nonlinear ultrasonic parameter β was studied. The dislocation density of strained samples was estimated by X-ray diffraction. Nonlinear ultrasonic testing was conducted to evaluate β, showing that this value increased with increasing dislocation density induced by different tensile elongations. It was shown that the ultrasonic secondharmonic generation technique can effectively evaluate the degradation behavior of metallic materials, and the prediction of the residual life of bearing parts in service can be made based on β and the dislocation density.P91 steel is an important bearing material used in nuclear power plants. The study of its mechanical degradation behavior is important for ensuring safe operation. The relationship between the dislocation density of P91 steel under different strains and the corresponding nonlinear ultrasonic parameter β was studied. The dislocation density of strained samples was estimated by X-ray diffraction. Nonlinear ultrasonic testing was conducted to evaluate β, showing that this value increased with increasing dislocation density induced by different tensile elongations. It was shown that the ultrasonic secondharmonic generation technique can effectively evaluate the degradation behavior of metallic materials, and the prediction of the residual life of bearing parts in service can be made based on β and the dislocation density.

关 键 词：dislocation density P91 steel nonlinear ultrasonic second order harmonic 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TM623[金属学及工艺—金属材料]