Abstract
Nitrogen pickup during air induction melting can result in porosity and a loss of fracture toughness in ultrahigh-strength quenched and tempered steel castings. Nitrogen atoms are easily adsorbed into liquid steel upon exposure to the air, and argon shrouding alone has limited effectiveness. Previous studies have shown that proper charge sequencing and maintaining a high amount of dissolved oxygen in the melt prior to tapping and deoxidation can limit nitrogen pickup in the melt. In the current study, the effect of melt practice and charging procedure on nitrogen pickup was studied as a function of hold time in a series of laboratory scale and commercially produced heats of a Cr-Ni-Mo-containing steel intended for ground engaging equipment. By controlling the melting time, purity of charge materials, and development of a dome shrouding method, the nitrogen content was reduced from 170 ppm to less than 80 ppm.
Recommended Citation
K. T. Amatanweze et al., "Controlling Nitrogen Pickup during Induction Melting of Ultrahigh-Strength Cr-Ni-Mo-V Steels," International Journal of Metalcasting, Springer, Jan 2025.
The definitive version is available at https://doi.org/10.1007/s40962-025-01708-2
Department(s)
Materials Science and Engineering
Keywords and Phrases
High-strength steels; Induction melting; Nitrogen pickup control; Steelmaking
International Standard Serial Number (ISSN)
2163-3193; 1939-5981
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Springer, All rights reserved.
Publication Date
01 Jan 2025
Included in
Applied Mechanics Commons, Civil and Environmental Engineering Commons, Engineering Mechanics Commons, Manufacturing Commons, Mechanics of Materials Commons, Metallurgy Commons, Structural Materials Commons
Comments
Army Research Office, Grant W911NF-20-2-0251