General Corrosion and Stress Corrosion Behaviors of 316Ti in Supercritical Water

The susceptibility to stress corrosion cracking (SCC) of 316Ti in supercritical water (SCW) at 550 ℃/25 MPa, 600 ℃/25 MPa and 650 ℃/25 MPa respectively, and the general corrosion behavior in supercritical water at 650 ℃/25 MPa and in subcritical water at 290 ℃/15.2 MPa respectively were studied. The mechanical properties of 316Ti were also investigated at different temperatures in air. The strain-stress curves obtained from slow strain rate tensile (SSRT) tests showed that the strength and elongation of 316Ti decreased as the temperature increased. The ex-situ scanning electron microscopy (SEM) showed that 316Ti had susceptibility to SCC only at 550 ℃ and 600 ℃. The tests in air showed that the yield strength and tensile strength of alloy 316Ti decreased as the temperature rose. The general corrosion experiment in supercritical water showed that the weight gain was subject to power function growth kinetics, while the one in subcritical water indicated the weight loss.