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| Interface characteristics between TiN and matrix and their effect on solidification structure |
| Tian-peng Qu1, De-yong Wang1, Hui-hua Wang1, Dong Hou1, Jun Tian1, Shao-yan Hu1, Li-juan Su1 |
| 1 Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China |
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Abstract Heterogeneous nucleation is an effective way to promote the dispersion and precipitation of second-phase particles in steel and refine the grain size of the solidification structure. Not only refining as-cast structure grain size, but TiN in ferritic stainless steel can also pin grain boundaries and restrain the overgrowth of grains during rolling. The interface characteristics between TiN and heterogeneous phases (high-melting inclusions and ferrite phase) were studied based on the wetting angles between molten steel with different compositions and TiN substrate, and on the matching degree between TiN and ferrite lattice. It was found that, for the molten steel with the same composition, the wetting angle with the TiN substrate was significantly smaller than the contact angles with the other three substrates, while the wetting angle between ferrite phase and TiN was the smallest. The lattice matching was compared among MgAl2O4, TiN and d matrix by means of a high-resolution transmission electron microscope, which revealed that a coherent or semi-coherent interface was formed between the crystal plane (400) of MgAl2O4 and the crystal plane (200) of TiN, as well as between the crystal plane (200) of TiN and the crystal plane (110) of d matrix, with a lattice misfit of 5.1% and 3.4%, respectively. Finally, these two characteristics between TiN and ferrite phase were both explained from the perspective of interfacial energy. The microstructure refinement mechanism from high temperature to room temperature can be better reflected by the proposed wetting–lattice misfit theory.
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| Cite this article: |
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Tian-peng Qu,De-yong Wang,Hui-hua Wang, et al. Interface characteristics between TiN and matrix and their effect on solidification structure[J]. Journal of Iron and Steel Research International, 2021, 28(9): 1149-1158.
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2021, Vol. 28 
