Effect of Oxides on Nucleation Behaviour in Supercooled Iron

Ohashi, Tetsuro; Hiromoto, Takeshi; Fujii, Hironobu; Nuri, Yoshio; Asano, Kōichi

doi:10.2355/tetsutohagane1955.62.6_614

Cited by 66 publications

(41 citation statements)

References 10 publications

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“…21,22) It is assumed that when equiaxed grain structures are obtained, the volume fraction is 0.5 (corresponding to the GTK model) and the degree of undercooling, necessary for the nucleation of δ-ferrite, is 1.0 K. Table 3 shows the incoherency of the crystal lattice of the δ phase with several types of inclusions. 7,10,23) The coherency of Al 2 O 3 was small and that of the spinel and TiN were large.…”

Section: Formation Of Equiaxed Structuresmentioning

confidence: 99%

Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

et al. 2013

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The effect of Mg and Ti addition on the solidification macrostructure of ferritic stainless steel was evaluated in order to obtain fine equiaxed grains. Equiaxed solidification was promoted by adding Mg and Ti.Ti addition affects the amount of TiN as a nucleation agent of δ-Fe and the increase in constitutional undercooling. Mg addition produces spinel oxide in the molten steel, which accelerates the TiN formation.[Al] content also have an influence on the equiaxed grain formation.

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Section: Formation Of Equiaxed Structuresmentioning

confidence: 99%

Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

et al. 2013

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“…TiN, [3][4][5] TiC, 3) or oxides of rare earth metals [6][7][8] are well-known compounds for enhancing the nucleation of the austenite or delta-ferrite phase in the steelmaking process. Recently, Ti-oxide and Ti-rich oxide have been reported as effective nucleation sites of delta-ferrite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and Al Addition on Solidification Structure of Ni–Fe–Mo–Cu Alloys

et al. 2011

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The effect of the addition of Ti and Al on the solidification structure of Ni-4%Mo-5%Cu-13%Fe (mass%) alloys was investigated. It was found that the addition of an optimal amount of both Ti and Al affects on the formation of equiaxed fine grains. Oxide films formed on the molten alloy surface (scum) were examined using a transmission electron microscope equipped with energy dispersive spectrometers. The scum was analyzed and found to contain two separated phases of TiO with the monoclinic structure and Al2O3 with the corundum structure. The TiO might be the NaCl structure at the melting point of the matrix phase.According to the lattice disregistry between the fcc Ni and oxides TiO with the NaCl structure has lower disregistry than Al2O3 with the corundum structure. These facts suggest that TiO precipitated with Al2O3 in Ni melt can form heterogeneous nucleation sites for the fcc Ni phase. The distribution conditions of TiO may be different between the Ti-added alloys and those with the addition of both Al and Ti. It is considered that the addition of both Al and Ti causes fine dispersion of TiO and promotes nucleation of the primary fcc Ni phase.

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“…TiN has been known as a good catalyst for the crystallization of Fe. 21,22) According to the results in Table 1, however, an undercooling of more than 70 K is needed for the spontaneous nucleation of TiN in liquid Fe.…”

Section: Spontaneous Nucleationmentioning

confidence: 99%

Thermodynamics of Microstructure Control by Particle Dispersion.

Nishizawa

2000

ISIJ International

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Effect of Oxides on Nucleation Behaviour in Supercooled Iron

Cited by 66 publications

References 10 publications

Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

Effect of Mg Addition on Equiaxed Grain Formation in Ferritic Stainless Steel

Effect of Ti and Al Addition on Solidification Structure of Ni–Fe–Mo–Cu Alloys

Thermodynamics of Microstructure Control by Particle Dispersion.

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