Precipitate/austenite equilibrium in a titanium-niobium ultra low carbon steel |
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| Affiliation: | 1. Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;2. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China;3. National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, School of Physics, Nanjing University, Nanjing 210093, China;4. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | The variation in the equilibrium compositions of austenite and titanium-niobium-carbonitride precipitates in Fe-Ti-Nb-C-N-Mn-Si-Mo is considered over a range of temperatures between 1050 and 1500K and for an alloy composition which is typical of ultra-low carbon titanium-niobium microalloyed steels. The Kohler temperature dependent-subregular solution model is used to describe the austenite phase. The (Ti,Nb)(C,N)x precipitate phase is described by the Hillert-Staffansson sublattice model for a four-component solution, with components mixed in pairs. The equilibrium between the two phases is explored while allowing for the nonstoichiometry of the precipitate phase. The results are shown to be in good agreement with experimental data on ultra-low carbon microalloyed steels. |
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