Influence of thermal aging on the intergranular corrosion resistance of types 304LN and 316LN stainless steels |
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Authors: | U Kamachi Mudali R K Dayal J B Gnanamoorthy P Rodriguez |
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Affiliation: | (1) Metallurgy Division, Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India;(2) Indira Gandhi Centre for Atomic Research, 603 102 Kalpakkam, India |
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Abstract: | Intergranular corrosion (IGC) resistance of types 304LN and 316LN stainless steels (SS) thermally aged at 823, 873, and 923
K for various durations was assessed by ASTM A262 practice A test (electrolytic etch test) and electrochemical potentiodynamic
reactivation (EPR) test. The results indicated that the type 316LN SS has significantly improved IGC resistance compared to
304LN SS. Based on the results of these tests, time-temperature-sensitization (TTS) diagrams were developed for both alloys.
The secondary precipitates formed during thermal aging treatments were electrochemically extracted and analyzed by X-ray diffraction
(XRD) to determine the types of precipitates formed during the aging treatments. The results indicated that the precipitates
were mostly of M23C6 carbides. |
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