Effect of Adding Ti on Solidification Structure of Fe-4%Si Alloy and Its Mechanism
BAI Huiyi1, JI Yunping1,2, LI Yiming3, REN Huiping1,2
1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China 2 Key Laboratory of Advanced Metal Material of Inner Mongolia Autonomous Region, Baotou 014010, China 3 Analytical and Testing Center of Inner Mongolia University of Science and Technology, Baotou 014010, China
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.
白慧怡, 计云萍, 李一鸣, 任慧平. 添加Ti对Fe-4%Si合金凝固组织的影响及机理[J]. 材料导报, 2021, 35(20): 20119-20123.
BAI Huiyi, JI Yunping, LI Yiming, REN Huiping. Effect of Adding Ti on Solidification Structure of Fe-4%Si Alloy and Its Mechanism. Materials Reports, 2021, 35(20): 20119-20123.
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2021, Vol. 35 
