Thermodynamic analysis of titanium precipitation in HRB500E seismic steel
ZENG Ze-yun1,2, LI Chang-rong1,2, LI Zhi-ying1,2, LIU Zhan-lin3,LI Zheng-song3, ZHAI Yong-qiang3
1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China; 2. Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang 550025,Guizhou, China; 3. Rolling Business Department, Shougang Shuicheng Steel, Liupanshui 553000, Guizhou, China
Abstract:The study of the existence of titanium compounds in liquid phase and solid phase during the solidification of molten steel has an important influence on the properties of solid phase structure, and the second phase precipitation played the role of grain refinement. In order to analyze the precipitation law of TiN, TiC and Ti(C,N) precipitate in HRB500E aseismic steel bar, the thermodynamics of TiN, TiC and Ti(C, N) precipitates were calculated. The results show that TiN and TiC cannot precipitate in the homogeneous state of molten steel, TiC0.19N0.81 precipitates at the temperature of 1 843 K; TiN has thermodynamic conditions for precipitation during solidification because of the enrichment of Ti and N at the solidification front with a temperature of 1 745 K; TiN and TiC particles have thermodynamic properties for precipitation in solid austenite; while TiC precipitates at a lower temperature than TiN,TiC particles precipitation in ferrite.
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