Corrosion behavior and microstructural evolution of ASTM A182 Grade 92 steel in liquid sodium at 650 °C. (August 2015)

• Record Type: Journal Article
• Authors: Shin, Sang Hun; Kim, Jun Hwan; Kim, Ji Hyun
• Is Part Of: Corrosion science. Volume 97(2015)
• Page Start: 172
• Page End: 182
• Publication Date: 2015-08
• Subjects: A. Steel -- B. EPMA -- B. TEM -- C. Carburization -- C. High-temperature corrosion -- C. Intergranular corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.05.004
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: ASTM A182 Grade 92 steel samples were exposed to liquid Na or Ar gas, both at 650 °C. Intergranular oxidation was found in the Na-exposed sample. The M2 (W, Mo) was not observed near the surface of Na-exposed samples. In comparison, the M2 (W, Mo) phase was observed mainly in Ar-gas exposed samples. Abstract: ASTM A182 Grade 92 steel was exposed to liquid sodium at 650 °C to investigate the effect of oxidation on microstructural evolution. Comparisons were made to the same material exposed to argon gas at 650 °C. In the sodium-exposed specimens, intergranular oxidation and chromium depletion were observed at the near-surface. With the argon-exposed specimen, however, this behavior at the surface was not observed. At the near-surface in specimens exposed to 650 °C liquid sodium, it was mostly M23 C6 carbide that was observed, whereas a M2 (W, Mo) phase was predominant in the bulk steel matrix in specimens exposed to both 650 °C sodium and argon.