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Dissolution Behavior of Complex Carbonitrides in a Microalloyed Steel  

Jung, Jae-Gil (Department of Materials Science and Engineering, Yonsei University)
Park, June-Soo (Department of Materials Science and Engineering, Yonsei University)
Ha, Yang-Soo (Department of Materials Science and Engineering, Yonsei University)
Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University)
Bae, Jin-Ho (Technical Research Laboratories, POSCO)
Kim, Kisoo (Technical Research Laboratories, POSCO)
Publication Information
Journal of the Korean Society for Heat Treatment / v.21, no.6, 2008 , pp. 287-292 More about this Journal
Abstract
Dissolution behavior of complex carbonitrides in a Nb-Ti-V microalloyed steel was quantitatively examined by electrical resistivity, transmission electron microscopy (TEM), and optical microscopy. The electrical resistivity increased with solution treatment temperature up to $1250^{\circ}C$ for a holding time of 15 min. But, an increasing rate of electrical resistivity with temperature was obviously decreased above $1150^{\circ}C$. As the solution treatment temperature increases, irregular shaped Nb-rich carbonitrides disappear and cuboidal Ti-rich carbonitrides are observed. Abnormal grain growth occurs above $1250^{\circ}C$ for a holding time of 15 min. The optimal solution treatment temperature of a Nb-Ti-V microalloyed steel was determined as $1200^{\circ}C$ for a holding time of 15 min.
Keywords
Microalloyed steel; Carbonitride; Dissolution temperature; Electrical resistivity;
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