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In Situ Observation of Acicular Ferrite Nucleation and Growth at Different Cooling Rate in Ti-Zr Deoxidized Steel

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Manuscript submitted March 24, 2019.

Abstract

The effects of cooling rate on acicular ferrite (AF) nucleation, growth, and inclusion characteristics in Ti-Zr deoxidation steel were studied by utilizing the high temperature confocal laser scanning microscope (HT-CLSM). The results indicated that with the increase of cooling rate, the ferrite start nucleation temperature decreased, and the difference of first nucleation temperature between AF and ferrite side plate (FSP) reduced. When the cooling rate increased to 10.0 °C/s, AF and FSP simultaneously nucleated at 564.5 °C. In addition, the AF actual growth rate rose with the increase of cooling rate and reached 30.13 µm/s at 10.0 °C/s cooling rate. The AF ratio in microstructure increased first and then decreased with the cooling rate increase and was up to the maximum 45.83 pct at 1.0 °C/s cooling rate. For inclusion characteristics, cooling rates had no obvious effect on inclusion types, but had a great influence on inclusions size distribution. With the cooling rate increase, the inclusion average diameter reduced, and diminished to 1.39 µm at 10.0 °C/s cooling rate. Finally, the AF nucleation on the Ti-Zr-Mn-O-S + TiN inclusion could be explained by the low lattice misfit between ferrite and TiN that precipitated on the Ti-Zr-Mn-O-S inclusion surface.

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Acknowledgements

The authors are grateful for the support from the National Natural Science Foundation of China (No. 51874081, 51574063) and Fundamental Research Funds for the Central Universities (N150204012).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, NO. 3-11, Wenhua Road, Heping District, Shenyang, 110819, P.R. China

    Yongkun Yang, Dongping Zhan, Hong Lei & Zhouhua Jiang

  2. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, P.R. China

    Guoxing Qiu & Yulu Li

  3. Metallurgical Engineering College, Liaoning Institute of Science and Technology, Benxi, 117004, P.R. China

    Huishu Zhang

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  1. Yongkun Yang
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Yang, Y., Zhan, D., Lei, H. et al. In Situ Observation of Acicular Ferrite Nucleation and Growth at Different Cooling Rate in Ti-Zr Deoxidized Steel. Metall Mater Trans B 50, 2536–2546 (2019). https://doi.org/10.1007/s11663-019-01668-z

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