The growth of austenite grains and the dissolution of carbonitrides under heating of a structural steel microalloyed with niobium and titanium are studied. The microstructure of the steel is investigated with the help of light and transmission electron microscopes. The content of elements in precipitated particles is determined using an energy dispersive spectrometer. The kinetic equation of grain growth is derived and the critical temperature above which the carbonitrides stop to hinder grain growth is determined. Recommendations are given on the temperature modes of hot rolling.
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Acknowledgements
The authors are grateful for the financial support from the National Natural Science Foundation of China (NSFC) (No. 51274154). The National High Technology Research and Development Program of China (No. 2012AA03A504), the State Key Laboratory of Development and Application Technology of Automotive Steels (the Baosteel Group), and the Hubei Education Committee (key project, No. 2121101).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 7 – 12, January, 2017.
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Yang, H.L., Xu, G., Wang, L. et al. A Study of Growth of Austenite Grains in a Steel Microalloyed with Ti and Nb. Met Sci Heat Treat 59, 8–13 (2017). https://doi.org/10.1007/s11041-017-0093-1
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DOI: https://doi.org/10.1007/s11041-017-0093-1