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Intergranular Corrosion Behavior of Low-Nickel and 304 Austenitic Stainless Steels

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Abstract

Intergranular corrosion (IGC) susceptibility for Cr-Mn austenitic stainless steel and 304 austenitic stainless steel (ASS) was estimated using electrochemical techniques. Optical and SEM microscopy studies were carried out to investigate the nature of IGC at 700 °C with increasing time (15, 30, 60, 180, 360, 720, 1440 min) according to ASTM standard 262 A. Quantitative analysis was performed to estimate the degree of sensitization (DOS) using double loop electrochemical potentiokinetic reactivation (DLEPR) and EIS technique. DLEPR results indicated that with the increase in thermal aging duration, DOS becomes more severe for both types of stainless steel. The DOS for Cr-Mn ASS was found to be higher (65.12% for 1440 min) than that of the AISI 304 ASS (23% for 1440 min). The higher degree of sensitization resulted in lowering of electrical charge capacitance resistance. Chronoamperometry studies were carried out at a passive potential of 0.4 V versus SCE and was observed to have a higher anodic dissolution of the passive film of Cr-Mn ASS. EDS studies show the formation of chromium carbide precipitates in the vicinity of the grain boundary. The higher Mn content was also observed for Cr-Mn ASS at the grain boundary.

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Acknowledgment

The authors would like to thank Director Dr. N.S. Chaudhary, VNIT Nagpur, for providing the necessary facilities for carrying out this investigation and for his constant encouragement to publish this work. The authors are grateful to Jageswar Verma (Research Scholar, Corrosion Engineering laboratory, Department of Metallurgical and Material Engineering) for his help in conducting the electrochemical tests and Mr. Shreedhar Gadge (Senior Technician, Chemical analysis laboratory Department of Metallurgical and Materials Engineering) for performing the solution annealing treatment.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, 440010, India

    Ankur V. Bansod, Awanikumar P. Patil & Nilay N. Khobragade

  2. Hoganas India Private Ltd., Koregaon Park, Pune, 411001, India

    Abhijeet P. Moon

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  1. Ankur V. Bansod
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  2. Awanikumar P. Patil
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Correspondence to Ankur V. Bansod.

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Bansod, A.V., Patil, A.P., Moon, A.P. et al. Intergranular Corrosion Behavior of Low-Nickel and 304 Austenitic Stainless Steels. J. of Materi Eng and Perform 25, 3615–3626 (2016). https://doi.org/10.1007/s11665-016-2221-2

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  • DOI: https://doi.org/10.1007/s11665-016-2221-2

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