Influence of thermal aging on the intergranular corrosion resistance of types 304LN and 316LN stainless steels

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02663836· OSTI ID:417848

Mudali, U K; Dayal, R K; Gnanamoorthy, J B; Rodriguez, P ^[1]

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1. Indira Gandhi Centre for Atomic Research, Kalpakkam (India)

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 M{sub 23}C{sub 6} carbides.

• Sponsoring Organization: USDOE
• OSTI ID: 417848
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 27; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
AGING
CARBIDES
CHEMICAL COMPOSITION
CORROSION RESISTANCE
ELECTROCHEMICAL CORROSION
FBR TYPE REACTORS
HEAT TREATMENTS
INTERGRANULAR CORROSION
PRECIPITATION
QUENCHING
REACTOR MATERIALS
STAINLESS STEELS
X-RAY DIFFRACTION