PR-261-103605-R01 Investigation on the Dormancy of Stress Corrosion Cracking (SCC) Cracks

Abstract

The objectives of this research were to investigate SCC dormancy and re-activation behavior in term of 1) effect of low frequency (= 10-5 Hz) and cyclic stress typical of pressure fluctuation (R = 0.8) and 2) the inhibitive effect of organics on the growth rate of SCC cracks. The project tasks included 1) Summary of literature on the dormancy of SCC cracks; 2) Literature results of near neutral pH SCC of X65 steels; 3) Upgrade and calibration of potential drop technique; 4) Crack growth rate measurements under steady cycle fluctuation of loading; 5) Crack growth rate measurements under fluctuating loading conditions; 6) Effect of organics. The dormancy of near neutral pH SCC has been investigated using potential - drop technique to measure crack growth rates under constant cyclic loading and fluctuating loading conditions.