Fatigue Damage Development in 14MoV6-3 Steel for Power Plant Pipes Monitored by Digital Image Correlation

In this paper,fatigue damage development of 14MoV6-3(13HMF)power engineering steel was studied through different experimental and analytical approaches.The specimens machined from the as-received pipe were subjected to fatigue loading and simultaneously monitored using the digital image correlation(DIC)technique.The damage development was analysed through microstructural observations of fracture surfaces and further described as a function of the fatigue damage parameter D and the fatigue damage measureφ.The combination of such parameters’evolution with the number of cycles to failure and the DIC technique enables a determination of separate stages of damage development.It was found that dynamics of damage could be effectively exposed within the first 100 cycles.