Understanding the effect of uniaxial tensile strain on the early stages of sensitization in AISI 304 austenitic stainless steel

Abstract

Abstract:In the present study, an attempt has been made to understand the effect of different competing mechanisms controlling the overall degree of sensitization (DOS) of deformed austenitic stainless steel at the early stage of sensitization. The Double Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) studies were performed to characterize the Degree of Sensitization (DOS) as functions of pre-defined strain and sensitization temperature. X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were used to explain the phenomena qualitatively. A non monotonous behaviour in the variation of DOS has been observed with deformation and sensitization temperature. The presence of Deformation Induced Martensites (DIM) and their transformation into tempered martensites ( + Fe 3 C) at higher temperatures was found to play major roles in controlling the overall sensitization and desensitization processes.

Evolution of intergranular corrosion resistance for HR3C heat-resistant austenitic stainless steel at elevated temperature

“…The DL-EPR test was conducted to evaluate the IGC resistance of specimens. The DL-EPR tests were carried out in the electrolyte of 0.5 M H 2 SO 4 and 0.01 M KSCN at ambient temperature [10]. A classical three-electrode electrochemical cell was utilised, wherein a saturated calomel electrode (SCE), a platinum plate and the specimen were used as reference electrode, counter electrode and working electrode, respectively.…”