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Kinetics of Precipitation during Hot Rolling and Cooling in Microalloyed Steels

机译：微合金钢热轧冷却过程中的析出动力学

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In the present study, an attempt was made to derive the precipitation-time-211u001etemperature relationship on the basis of the thermodynamics of microalloyed steel 211u001e(MA) systems and diffusion controlled nucleation and growth of precipitates. An 211u001eimportant benefit of the thermodynamic model developed previously for 211u001emicroalloyed steels is that it can be used to determine the free energy driving 211u001eforce for precipitation and so make an important contribution to solving the 211u001enucleation problem. The driving force for precipitation can be calculated taking 211u001einto account all elements which are present and their interations. There still 211u001eremains an unknown parameter, which is a function of the type of site at which 211u001enucleation of the precipitation occurs, but with a single free parameter the 211u001evarious effects of composition and temperature can be computed. In the present 211u001eapproach this free parameter has been associated with the average dislocation 211u001edensity. The theoretically calculated result were compared with the experimental 211u001eresults on precipitation of TiN, TiC, Nb (C,N) and V (C,N) in HSLA steels in 211u001econjunction with relationships for grain growth, recrystallization and 211u001eprecipitation strengthening.

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