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Nucleation kinetics of Ti carbonitride in microalloyed austenite

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Abstract

Ti(CN) precipitation data determined by stress relaxation are analyzed using the classical theory of diffusion controlled nucleation. For this purpose, the interface energy γ and strain energy ΔG ɛ accompanying nucleus formation are estimated using a new approach, and the driving force for Ti(CN) nucleation is calculated with the aid of a thermodynamic model. The analysis indicates that the critical nucleus is richer in N than the bulk precipitate at equilibrium at a given holding temperature. The results also show that trace amounts of nitrogen dissolved in austenite can significantly increase the chemical driving force for Ti(CN) nucleation and thereby accelerate the rate of precipitation. On the basis of this analysis, a kinetic model is developed for predicting start times (P S) for the strain-induced precipitation of Ti(CN) in austenite. Such predictions are in reasonably good agreement with measuredP S times.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, McGill University, 3450 University Street, H3A 2A7, Montreal, Canada

    W. J. Liu (Research Associate) & J. J. Jonas (Professor)

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  1. W. J. Liu
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  2. J. J. Jonas
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Liu, W.J., Jonas, J.J. Nucleation kinetics of Ti carbonitride in microalloyed austenite. Metall Trans A 20, 689–697 (1989). https://doi.org/10.1007/BF02667586

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