INFLUENCE OF THERMAL AGING ON THE INTERGRANULAR CORROSION-RESISTANCE OF TYPES 304LN AND 316LN STAINLESS-STEELS

Authors
MUDALI UK DAYAL RK GNANAMOORTHY JB RODRIGUEZ P
Citation
Uk. Mudali et al., INFLUENCE OF THERMAL AGING ON THE INTERGRANULAR CORROSION-RESISTANCE OF TYPES 304LN AND 316LN STAINLESS-STEELS, Metallurgical and materials transactions. A, Physical metallurgy andmaterials science, 27(10), 1996, pp. 2881-2887
Citations number
34
Categorie Soggetti
Metallurgy & Metallurigical Engineering","Material Science
Journal title
Metallurgical and materials transactions. A, Physical metallurgy andmaterials science → ACNP
ISSN journal
10735623
Volume
27
Issue
10
Year of publication
1996
Pages
2881 - 2887
Database
ISI
SICI code
1073-5623(1996)27:10<2881:IOTAOT>2.0.ZU;2-I
Abstract
Intergranular corrosion (IGC) resistance of types 304LN and 316LN stai nless steels (SS) thermally aged at 823, 873, and 923 K for various du rations was assessed by ASTM A262 practice A test (electrolytic etch t est) and electrochemical potentiodynamic reactivation (EPR) test. The results indicated that the type 316LN SS has significantly improved IG C resistance compared to 304LN SS. Based on the results of these tests , time-temperature-sensitization (TTS) diagrams were developed for bot h alloys. The secondary precipitates formed during thermal aging treat ments were electrochemically extracted and analyzed by X-ray diffracti on (XRD) to determine the types of precipitates formed during the agin g treatments. The results indicated that the precipitates were mostly of M(23)C(6) carbides.