| The corrosion-fatigue life of drill-pipe steels in simulated offshore-drilling environments was predicted using an analytical model. This model, named the Active-Path-Dissolution (APD) model, simulates a sequence of three corrosion-fatigue processes: chemical notching process, microcrack development, and macroscopic crack growth. The first two processes are combined with mechanical fatigue to simulate corrosion-fatigue crack initiation. A series of fatigue-life simulations for a variety of corrosion-fatigue conditions were carried out. The effects of fluid aeration, electrolytic conductivity (;The APD model partitioning of the corrosion-fatigue cracking into three processes was confirmed by observations of the electrochemical potential (E;Comparison of experimental results with the APD model simulations showed satisfactory agreement. Both the APD model and the experimental results suggest that altering the electrochemical potential (E... |
