Kinetics of nitrogen absorption in molten aisi 316 stainless steel during immersion nitrogen blowing

• Published in: Metals and materials international Vol. 18; no. 1; pp. 143 - 148
• Main Authors: Chen, Jian-Bin, Chen, Qi-Zhong, Chen, Zhao-Ping, Jiang, Zhou-Hua, Huang, Zong-Ze, Pan, Jia-Qi
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2012; Springer Nature B.V; 대한금속·재료학회
• Subjects: Absorption; Activation energy; Aluminum oxide; Austenitic stainless steels; Blowing; Characterization and Evaluation of Materials; Engineering Thermodynamics; Heat and Mass Transfer; Immersion; Liquid metals; Machines; Magnetic Materials; Magnetism; Manufacturing; Mass transfer; Materials Science; Mathematical analysis; Metallic Materials; Nitrogen; Nozzles; Processes; Reaction mechanisms; Solid Mechanics; Stainless steel; Stainless steels; Submerging; Surface chemistry; 재료공학; metals; nitrogen absorption; liquids; immersion blowing; kinetics; stainless steel
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-012-0017-y

Nitrogen absorption in molten metal for stainless steel AISI316 has been investigated by immersion nitrogen blowing through an immersed alumina nozzle with an internal diameter of 3 mm. Based on these experimental data, some kinetic parameters of nitrogen absorption, such as reaction order, rate constant and apparent activation energy of nitrogen absorption reaction, have been obtained. Effect of stirring by immersion nitrogen blowing through an immersed alumina nozzle on nitrogen absorption reaction has been observed. Results show the following: (1) Nitrogen absorption reaction is the −1.5th order reaction. The rate constant k N is of the order of 10 −5 wt% 2.5 ·min −1 . Nitrogen absorption reaction for AISI 316 has negative apparent activation energy of −92.40 kJ·mol −1 . This indicates that the nitrogen absorption reaction has a complex and multistep reaction mechanism. (2) The rate of nitrogen absorption reaction in molten stainless steel is mixture control by the adsorption of monatomic nitrogen on the surface of molten stainless steel and mass transfer in molten metal. (3) A rate equation of nitrogen absorption reaction has been derived based on a mixed control mechanism by both the -1st order nitrogen absorption reaction and mass transfer in molten metal.