Oxidation of Fe-(5.3-29.8)%Mn-(1.1-1.9)%Al-0.45%C Alloys at 550-650

• Published in: Corrosion science and technology Vol. 21; no. 1; pp. 53 - 61
• Main Authors: Park, Soon Yong, Xiao, Xiao, Kim, Min Ji, Lee, Geun Taek, Hwang, Dae Ho, Woo, Young Ho, Lee, Dong Bok
• Format: Journal Article
• Language: Korean
• Published: 한국부식방식학회 28.02.2022
• Subjects: High-Mn steel; Iron; Manganese; Oxidation; Oxide scale; Oxide scale; High-Mn steel; Oxidation; Iron; Manganese
• ISSN: 1598-6462

Alloys of Fe-(5.3-29.8)%Mn-(1.1-1.9)%Al-(0.4-0.5)%C were oxidized at 550℃ to 650℃ for 20 h to understand effects of alloying elements on oxidation. Their oxidation resistance increased with increasing Mn level to a small extent. Their oxidation kinetics changed from parabolic to linear when Mn content was decreased and temperature was increasing. Oxide scales primarily consisted of Fe 2 O 3 , Mn 2 O 3 , and MnFe 2 O 4 without any protective Al-bearing oxides. During oxidation, Fe, Mn, and a lesser amount of Al diffused outward, while oxygen diffused inward to form internal oxides. Both oxide scales and internal oxides consisted of Fe, Mn, and a small amount of Al. The oxidation of Mn and carbon transformed γ- matrix to α-matrix in the subscale. The oxidation led to the formation of relatively thick oxide scales due to inherently inferior oxidation resistance of alloys and the formation of voids and cracks due to evaporation of manganese, decarburization, and outward diffusion of cations across oxides.