Abstract
This study investigated the susceptibility to intergranular corrosion (IGC) in austenitic stainless steel with various degrees of sensitization (DOSs) from a microstructural viewpoint based on the coincidence site lattice (CSL) model. IGC testing was conducted using oxalic acid and type 304 stainless steel specimens with electrochemical potentiokinetic reactivation (EPR) ratios that varied from 3 to 30%. As a measure of IGC susceptibility, the width of the corroded groove was used. The relationship between IGC susceptibility, grain boundaries (GB) structure, and EPR ratio of the specimens was evaluated. As a result, the IGC susceptibility cannot be characterized using the Σ value, irrespective of the DOS of the specimen. The IGC susceptibility increases with increasing unit cell area of CSL boundaries, which is a measure of the stability of the CSL boundaries, and then levels off. The relationship between the IGC susceptibility and unit cell area is sigmoidal, irrespective of the DOS of the specimen. The sigmoid curve shifts rightward and the upper bound of IGC susceptibility decreases with decreasing DOS of the specimen.
Highlights
Austenitic stainless steel exhibits superior mechanical properties and corrosion resistance to aqueous, gaseous, and high-temperature environments, and is used for pipes in chemical plants and coolant pipes in light water reactors
Susceptibility in TIG-welded 316LN stainless steel by the double-loop electrochemical potentiokinetic reactivation (DL-EPR) technique, and found that a welded area exhibits a slight intergranular corrosion (IGC) susceptibility, the base metal exhibits superior IGC resistance. These results indicate that chromium depletion zones were formed near grain boundaries (GB) during welding and the IGC resistance decreased even in high-corrosion resistant 316LN stainless steel
Stainless in simulated groundwater onetthe contentthe in the. They of type stainless steel in simulated groundwater based on the carbon content in the found that high-angle GBs in 304L stainless steel containing more than 0.02% carbon exhibited steel. They found that high-angle GBs in 304L stainless steel containing more than 0.02% carbon exhibited high From a microstructural/crystallographic viewpoint, atomic force microscopy (AFM), scanning
Summary
Austenitic stainless steel exhibits superior mechanical properties and corrosion resistance to aqueous, gaseous, and high-temperature environments, and is used for pipes in chemical plants and coolant pipes in light water reactors. Xin et al [2] investigated the IGC susceptibility in TIG-welded 316LN stainless steel by the double-loop electrochemical potentiokinetic reactivation (DL-EPR) technique, and found that a welded area exhibits a slight IGC susceptibility, the base metal exhibits superior IGC resistance. These results indicate that chromium depletion zones were formed near GBs during welding and the IGC resistance decreased even in high-corrosion resistant 316LN stainless steel.
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