Here the effect of nitrogen on the intergranular stress corrosion cracking (SCC) resistance of sensitized Type 316LN stainless steel containing different amounts of nitrogen is reported. SCC studies were performed at 70% of yield strength. Double-loop electrochemical potentiokinetic reactivation technique was used to quantify degree of sensitization (DOS) that was correlated with SCC resistance. SCC time to failure increased from 220 h to 285 h with increasing nitrogen content from 0.07 wt% to 0.14 wt%, but decreased drastically to approximately 120 h at 0.22 wt% nitrogen (i.e., beyond N solubility limit), due to excessive precipitation of Cr23C6 and Cr2N and drastic reduction in the coincidence site lattice (CSL) boundary distribution from 48% to approximately 32%. Scanning electron microscope images showed mixed mode of failure.
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1 June 2020
SCIENCE SECTION|
March 16 2020
Effect of Nitrogen on the Intergranular Stress Corrosion Cracking Resistance of 316LN Stainless Steel
Anita Toppo;
Anita Toppo
‡
*Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
‡Corresponding author. E-mail: [email protected].
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Vani Shankar;
Vani Shankar
**Materials Development and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
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R.P. George;
R.P. George
*Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
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John Philip
John Philip
*Corrosion Science and Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India.
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CORROSION (2020) 76 (6): 591–600.
Article history
Received:
October 22 2019
Revision Received:
March 16 2020
Accepted:
March 16 2020
Citation
Anita Toppo, Vani Shankar, R.P. George, John Philip; Effect of Nitrogen on the Intergranular Stress Corrosion Cracking Resistance of 316LN Stainless Steel. CORROSION 1 June 2020; 76 (6): 591–600. doi: https://doi.org/10.5006/3417
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