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http://dx.doi.org/10.14775/ksmpe.2022.21.01.056

Microstructure and Corrosion Characteristics of Austenitic 304 Stainless Steel Subjected to Long-term Aging Heat Treatment  

Huh, ChaeEul (Department of Advanced materials and Engineering, Chosun UNIV.)
Kim, ChungSeok (Department of Materials Science and Engineering, Chosun UNIV.)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.21, no.1, 2022 , pp. 56-65 More about this Journal
Abstract
The electrochemical corrosion properties of austenitic AISI 304 steel subjected to a long-term-aging heat treatment were investigated. AISI 304 steel was aged at 700 ℃ for up to 10,000 h. The variation in the microstructure of the aged specimens was observed by optical microscopy and scanning electron microscopy. Electrochemical polarization experiments were performed to obtain the corrosion current density (Icorr) and corrosion potential (Ecorr). Analyses indicated that the metastable intermetallic carbide M23C6 formed near the γ/γ grain boundary and coarsened with increasing aging time; meanwhile, the δ-ferrite decomposed into the σ phase and into M23C6 carbide. As the aging time increased, the current density increased, but the corrosion potential of the austenitic specimen remained high (at least 0.04 ㎛/cm2). Because intergranular carbide was absent, the austenitic annealed specimen exhibited the highest pitting resistance. Consequently, the corrosion resistance of austenitic AISI 304 steel decreased as the aging heat treatment time increased.
Keywords
Austenitic 304 Sainless Steel; Long-term Aging; Corrosion; Sensitization;
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