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Abstract The stress corrosion cracking behavior of 321 stainless steel has been studied in high temperature water. Analytical electron microscopy was utilized to characterize the cracking process to better understand… Click to show full abstract
Abstract The stress corrosion cracking behavior of 321 stainless steel has been studied in high temperature water. Analytical electron microscopy was utilized to characterize the cracking process to better understand the δ-ferrite effect. Results showed that δ-ferrite inhibited the crack growth by changing the cracking direction along the γ/δ boundary and creating a highly branched crack path. δ-ferrite was also a source of Cr to facilitate the formation of protective Cr-rich oxides at the γ/δ boundaries. Ti(CN) particles in the γ/δ boundary tended to blunt the crack tip and inhibit further oxidation, and thus impeded the total crack growth.
Journal Title: Corrosion Science
Year Published: 2019
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