Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel

Jiazhi An; Zhaozhen Cai; Miaoyong Zhu

doi:10.1007/s12613-021-2375-2

Volume 29 Issue 12

Dec. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(12): 2172-2180

Jiazhi An, Zhaozhen Cai, and Miaoyong Zhu, Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2172-2180. https://doi.org/10.1007/s12613-021-2375-2

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Jiazhi An, Zhaozhen Cai, and Miaoyong Zhu, Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2172-2180. https://doi.org/10.1007/s12613-021-2375-2

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Research Article

Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel

+ Author Affiliations

Corresponding authors:
Zhaozhen Cai E-mail: caizz@smm.neu.edu.cn

Miaoyong Zhu E-mail: myzhu@mail.neu.edu.cn
Received: 18 July 2021; Revised: 3 November 2021; Accepted: 8 November 2021; Available online: 9 November 2021

Abstract

Abstract

The effect of titanium content on the refinement of austenite grain size in as-cast peritectic carbon steel was investigated by fast directional solidification experiments with simulating the solidification and growth of surface and subsurface austenite in continuously cast slabs. Transmission electron microscope (TEM) and scanning electron microscope (SEM) were used to analyze the size and distribution of Ti(C,N) precipitates during solidification. Based on these results, the pinning pressure of Ti(C,N) precipitates on the growth of coarse columnar grains (CCGs) was studied. The results show that the austenite microstructure of as-cast peritectic carbon steel is mainly composed of the regions of CCGs and fine columnar grains (FCGs). Increasing the content of titanium reduces the region and the short axis of the CCGs. When the content of titanium is 0.09wt%, there is no CCG region. Dispersed microscale particles will firstly form in the liquid, which will decrease the transition temperature from FCGs to CCGs. The chain-like nanoscale Ti(C,N) will precipitate with the decrease of the transition temperature. Furthermore, calculations shows that the refinement of the CCGs is caused by the pinning effect of Ti(C,N) precipitates.
- peritectic steel;
- grain refinement;
- coarse columnar grain;
- titanium carbonitride;
- pinning pressure

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