Evaluation of material degradation of 1Cr-1Mo-0.25V steel by non-destructive method

In this study, specimens with several different degradation levels were prepared by isothermal aging heat treatment at 630 °C for evaluating material degradation of 1Cr-1Mo-0.25V. The results from tensile and fracture tests were compared with those from BI tests, the dc potential drop and the ultrasonic method. These results show that normalized Brinell hardness agrees well with normalized tensile strength at the viewpoint of material degradation. It also shows the tensile strength and fracture toughness of degraded material can be determined by Brinell hardness, resistivity and the attenuation coefficient by the ultrasonic method.