Materials Reports  2022, Vol. 36 Issue (Z1): 21040258-5 |
| METALS AND METAL MATRIX COMPOSITES |
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| Study on Induced Nucleation Behavior of Secondary Acicular Ferrite |
| LI Qiuping1, ZHANG Qingjun1, ZHU Liguang1,2
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1 Hebei High Quality Steel Continuous Casting Engineering Technology Research Center, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210,Hebei, China
2 College of Material, Hebei University of Science and Technology, Shijiazhuang 050000, China |
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Abstract In the process of oxide metallurgy, intragranular acicular ferrite is an excellent structure that can effectively refine grains and improve the overall performance of steel. In this work, throuth metallographic microscope, scanning electron microscope and transmission electron microscope, the organization, microstructure and nucleation mechanism of secondary acicular ferrite, which was formed by the nucleation of primary ferrite induced by inclusions, were analyzed and studied. The results show that the primary acicular ferrite stimulates nucleation and the secondary acicular ferrite is a non-coherent structure and belongs to the edge-to-face nucleation model. The formation of secondary ferrite is related to the composition of inclusions that induce nucleation of primary acicular ferrite, the location of excited nucleation and the cooling rate. Initially, the nucleation point is a shear transformation, and the regular short-range migration of carbon atoms collectively reduces the system energy instantly. Followed by the interface-controlled diffusion transition, carbon atoms diffuse and migrate at the grain boundary between the primary and secondary acicular ferrite, then the nucleation energy is reduced through carbon solute enrichment and discontinuous diffusion, and finally the nucleation process is completed.
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Published: 05 June 2022
Online: 2022-06-08
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| Fund:National Natural Science Foundation of China-Regional Innovation and Development Joint Fund Key Project(U21A20114),the National Natural Science Foundation of China (51874137) and Hebei Natural Science Foundation-Steel Joint Research Fund (E2020209044). |
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