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Continuous-cooling-precipitation kinetics of Nb(CN) in high-strength low-alloy steels

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Abstract

Although isothermal precipitation has been frequently studied with respect to industrial hot deformation processing, the temperature decreases continuously under these conditions so that isothermal data cannot be applied directly to predict the precipitation kinetics. This study therefore was concerned with the continuous-cooling-precipitation (CCP) behavior of Nb carbonitride in austenite. In the present work, the Liu-Jonas (L-J) model was used to calculate the precipitation start (P s) time at a given temperature from experimental data. A new calculation method for predicting the precipitation finish (P f) time, based on reaction kinetics and classical nucleation and growth theory, was also developed. The additivity rule was then used to calculate the extent of precipitation during continuous cooling. Isothermal precipitation rates for 0.04 pct Nb steels were measured experimentally by the stress relaxation method. The CCP behavior was then calculated from the model, and the accuracy of the predictions was evaluated by carrying out continuous-cooling tests using a deformation dilatometer. The precipitate size distributions were determined by the transmission electron microscopy of specimens quenched after increasing intervals of cooling at various cooling rates. TheP s andP f times estimated from the particle size data show good agreement with the calculated CCP behavior.

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Authors and Affiliations

  1. Steel Products Department, RIST, PO Box 135, 790-600, Pohang, Republic of Korea

    S. H. Park (Senior Researcher)

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

    S. Yue (Assistant Professor) & J. J. Jonas (CSIRA-NSERC Professor of Steel Processing)

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  1. S. H. Park
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  2. S. Yue
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  3. J. J. Jonas
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Park, S.H., Yue, S. & Jonas, J.J. Continuous-cooling-precipitation kinetics of Nb(CN) in high-strength low-alloy steels. Metall Trans A 23, 1641–1651 (1992). https://doi.org/10.1007/BF02804360

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