Evolution of local atomic structure during solidification of Fe-RE (RE=La, Ce) alloy

Gao, Xueyun; Wang, Haiyan; Lü, Xing; Ma, Cainv; Ren, Huiping

doi:10.1016/j.jnoncrysol.2020.120109

Cited by 1 publication

(1 citation statement)

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“…The results show that containg-Ce oxide is potential nucleant for the heterogeneous nucleation of both the δ-Fe and γ-Fe primary phases during the solidification of steels, and it promotes grain refining. Also, Ce promotes the formation of random hexagonal close packing structures during the nuclei formation process, and thus helps to reduce nucleation-free energy [ 26 ]. As shown in Figure 3 , the grains will be coarsened with the increase of Ce.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cerium on the Microstructure and Inclusion Evolution of C-Mn Cryogenic Vessel Steels

Zhi

Zhang

et al. 2021

Materials

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The effects of Cerium (Ce) were studied on the casting slab quality, microstructure, and inclusion evolution of cryogenic vessel steel. An optical metallographic microscope, scanning electron microscope, energy dispersive spectrometer, and Thermo-calc thermodynamic software were used for characterization and analysis. The results indicated that the central segregation was significantly improved after adding Ce and reached the lowest level when the content of Ce was 0.0009 wt.%. Meanwhile, the presence of Ce reduces the size of ferrite and improves pearlite morphology. Ce also enables the modification of Al2O3 and MnS + Ti4C2S2 inclusions into ellipsoid CeAlO3 and spherical Ce2O2S + Ti4C2S2 composite inclusions, respectively, which are easier to remove. The formed Ce2O2S inclusions are fine and can work as heterogeneous nucleation points to refine the microstructure of steel.

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Section: Resultsmentioning

confidence: 99%