添加Ti对Fe-4%Si合金凝固组织的影响及机理

doi:10.11896/cldb.20080129

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Abstract AFe-4%Si alloy was selected to investigate the effect of Ti addition on the refinement of the structure during solidification for it can retain the primary δ-ferrite to room temperature after solidification. The macrostructures of the Fe-4%Si alloys with and without Ti addition were observed through a digital camera. The Ti-containing compounds were examined using a scanning electronic microscope (SEM) equipped with energy-dispersive X-ray spectroscopy (EDS). The phase identifications of the Ti-containing compounds were conducted by combining the electron backscatter diffraction (EBSD) with the EDS. To evaluate the possibility and the potency of the heterogeneous nucleation of δ-ferrite on the TiN particles with high melting points from the crystallographic point view, the edge-to-edge matching (E2EM) model was used to calculate the atomic matching mismatch between the TiN particles and δ-ferrite and predict the orientation relationship between them. The solute effect of Ti on the grain refinement of Fe-4%Si alloy was theoretically discussed. The results show that the columnar structures in the Fe-4%Si alloy as-cast changed to total equiaxed crystals through addition of 0.065% Ti. The combination of the heterogeneous nucleation of δ-ferrite on the in-situ formed TiN and the solute action of Ti resulted in the transformation of columnar structures to equiaxed crystals in Fe-4%Si alloy during solidification. The solidification microstructure of Fe-4%Si alloy is effectively refined.

Key words： Ti δ-ferrite grain refinement in solidification heterogeneous nucleation solute effect

Published: 12 November 2021

CLC number:

TG111.4

Fund:National Natural Science Foundation of China (51761034).

Corresponding Authors: jiyunpingpp@163.com

About author:: Huiyi Bai received her M.S. degree in June 2017 from Inner Mongolia University of Science and Technology. From September 2019 to now, she learned at Inner Mongolia University of Science and Technology, focusing on the research on crystallography on grain refinement of as-cast metal and alloy.
Yunping Ji is currently a professor in Inner Mongolia University of Science and Technology. Her research interests are as follows: crystallography on grain refinement of as-cast metal and alloy; basic research on the application of rare earths in steel materials; research on the microstructure of high-performance and high-precision steel materials.

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Cite this article:

BAI Huiyi,JI Yunping,LI Yiming, et al. Effect of Adding Ti on Solidification Structure of Fe-4%Si Alloy and Its Mechanism[J]. Materials Reports, 2021, 35(20): 20119-20123.

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http://www.mater-rep.com/EN/10.11896/cldb.20080129 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20119

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