Most of the data on the stress corrosion cracking (SCC) of Inconel 600† (UNS(1) N06600) in thiosulfate solution were for sensitized conditions and were obtained from the U-bend test, slow strain rate, constant load, and constant extension tests, using non-precracked specimens.1-2 Although crack propagation velocities had been determined in these studies, only average values were reported. In this study, the SCC growth rate as a function of stress intensity factor in solution-annealed Inconel 600 alloy in thiosulfate solutions has been investigated using precracked specimens. The electrochemical behavior of this material has also been explored.
The composition of the Inconel 600 used in this study is given in Table 1. Solution annealing at 1095°C for 1 h followed by water quenching was applied for the 12.7-mm-thick specimen blanks.
Potentiodynamic polarization curves were measured in deaerated sodium thiosulfate solutions of various concentrations (0.003 to 0.1 M) at 95°C....
