Vacuum Oxy-nitrocarburization of Ultra Fine Electrolytic Iron

✍ Scribed by M.P. Nikolova; P.S. Danev; I.D. Dermendjiev; D.D. Gospodinov

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 662 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.403

✦ Synopsis

Samples of Armco iron with electrolytic Fe coating were hardened by vacuum oxy-nitrocarburizing at low temperature. The carbon amount (CO 2 ) in the nitriding atmosphere (NH 3 ) was 10 vol. % at a pressure of 8.10 4 Pa and the process time was 7 h. The influence of the structural difference on the depth profile, hardness distribution and Xray diffraction pattern of the oxy-nitrocarburized specimens were performed. The indicated parameters of the modified surface of electrolyte-precipitated Fe were compared to those of recrystallized at low-temperature and fully annealed in vacuum and oxy-nitrocarburized specimens. The results confirmed formation of 'and ε-phases in the compound layer in all samples in different proportions. A significant difference in the phase distribution between the electrolyte-precipitated Fe layer and the substrate was demonstrated due to the ultra fine grained structure of the iron.