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The present investigation has been carried out to clarify the potential dependence of stress corrosion cracking (SCC) susceptibility of austenitic stainless steels deformed at high strain rate. The specimens were prepared from SUS 301 stainless steel sheets with unstable austenite, deformed at low or high strain rate. Then the potential dependence of SCC susceptibility by constant potential method was estimated in boiling 35% MgCl2 solution under the constant applied stress. The main results obtained are summarized as follows: (1) Effects of pre-plastic strain and strain rate on SCC susceptibility were recognized at the SCC critical potential. Its critical potential of these specimens deformed at high strain rate shifted monotonously to more noble values with increasing pre-plastic strain, while at low strain rate shifted to most noble values within the certain pre-plastic strain range. (2) The potential ranges in which SCC, pitting and general corrosion occured were recognized with these specimens deformed at low and high strain rate. It was observed that the time variation of current density proper to each corrosion mode. (3) The level of passivation current density showed by the anodic polarization curves was one of cause for the difference in SCC susceptibility of these specimens deformed at low and high strain rate. (4) Effect of applied potential on SCC fracture surface mode was recognized at annealed specimens. It was observed that the rate of transgranular fracture for intergranular fracture increased as applied potential shifted to more noble values.

Potential Dependence of Stress Corrosion Cracking Susceptibility of SUS 301 Stainless Steel Deformed at High Strain Rate