Abstract：Titanium compounds in the solidification process of molten steel has an important effect on the properties of solid phase microstructure,the second phase precipitation played the role of grain refinement. In order to analyze the Precipitation Law of TiN, TiC and Ti(C,N) precipitates in HRB500E aseismic steel bar, the thermodynamic of TiN, TiC and Ti(C, N) precipitates was calculated. The results show that TiN and TiC can not precipitate in the homogeneous state of molten steel, TiC0.19N0.81 precipitates at temperature of 1843K; TiN has thermodynamic conditions for precipitation during solidification because of the enrichment of Ti and N at the solidification front with a temperature of 1745K; 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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