Characterization and Control of Secondary Phase Precipitation of Nb–V–Ti Microalloyed Steel during Continuous Casting Process

Zou, Leilei; Zhang, Jiangshan; Liu, Qing; Tao, Biao

doi:10.2355/isijinternational.isijint-2022-172

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…According to the Gibbs–Curie–Wulff theorem, the central distances of the crystal faces from a point within the crystal are proportional to the corresponding specific surface energies of these faces. 25–35 In simple terms, the faces with lower surface energy grow fast, which is to be the main exposed face. Therefore, the surface energy corresponding to the exposed crystal face is low.…”

Section: Resultsmentioning

confidence: 99%

Precipitate behaviour of large-sized Nb(C, N) in micro-alloyed steel

Li,

Liu,

Zhang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The large-sized Nb-rich particles become a crack source easily because it is very brittle and will resist deformation under stress. HT-CLSM experiments and thermodynamic calculations were performed to investigate the precipitate behaviour of large-sized Nb(C, N) in micro-alloyed steel. The precipitate composition in the casting specimen was detected to be MnS and Nb-rich particles distributed along the crack. The results suggest the large-sized Nb-rich particles precipitate at the solidification process, instead of liquid. The precipitates for the HT-CLSM specimen is Nb(C, N), and Nb(C, N) is mainly distributed in a chain-like, clustered way in which the growth of Nb(C, N) is limited by the last to solidify region. The size of most Nb(C, N) is between 10 and 30 μm in the length direction, and the size of Nb(C, N) in the width direction tends to decrease with the increase of cooling rate attributed to larger super-cooling degree and weaker diffusion ability of solute atom. Because of solute segregation, a hypo-eutectic reaction occurs, L→Nb(C, N)+ γ-Fe. Nb(C, N) and γ-Fe are interactively precipitated to form a clustered Nb(C, N). When the holding temperature is high, and the cooling rate is rapid, a little liquid exists in the dendrite that is close to the eutectic composition. Because γ-Fe preferentially attaches to the previous dendrite, a divorce eutectic reaction occurs, forming a single Nb(C, N). MnS can act as the nucleation site of Nb(C, N) with the orientation relationship of MnS(100)//NbC(100).

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Section: Resultsmentioning

confidence: 99%

Precipitate behaviour of large-sized Nb(C, N) in micro-alloyed steel

Li,

Liu,

Zhang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

View full text Add to dashboard Cite

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Numerical Study on the Effects of Variable Mushy Zone Constants on Fluid Flow and Heat Transfer in Bloom Mold

Yao,

Wang,

Cao

et al. 2024

steel research int.

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In previous studies, the mushy zone constant was assigned a fixed value or a value associated with dendrite characteristics at room temperature. However, elucidating the constitutive behaviors of mushy dendrites at high temperatures using solid dendrite characteristics at room temperature poses challenges. In this study, a numerical model was constructed to investigate the effects of variable mushy zone constants on fluid flow and heat transfer in the mold. The results revealed that “Zone Z‐1/2” exhibited a thinner solidified shell compared with the other zones, indicating a close correlation between heat transfer and thickness differences. Under default simulation conditions, the liquid steel cooled rapidly, leading to the dissipation of superheat. The mushy zone exhibited a wide range, with almost no pure liquid phase present in the mold. In cases 2, 3, and 4 within “Zone Z‐1/2”, the average thickness of the solidified shell gradually increased during solidification, indicating the absence of evident remelting phenomena in the mold. As the variable mushy zone constants increased, the local temperature gradient increased, while the local cooling rate decreased. The accuracy of the numerical model was validated through actual measurements and empirical formulas. The simulation results for case 4 exhibited a high degree of fitting.

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Study on Secondary Phase Precipitation Behavior of Ship Plate Steel Slab Under Different Cooling Rates in Continuous Casting Process

Wang,

Liu,

Tao

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Characterization and Control of Secondary Phase Precipitation of Nb–V–Ti Microalloyed Steel during Continuous Casting Process

Abstract:    is proposed and has been applied on an actual caster, which improves the crack resistance of the bloom surface microstructures.

Cited by 3 publications

References 38 publications

Precipitate behaviour of large-sized Nb(C, N) in micro-alloyed steel

Precipitate behaviour of large-sized Nb(C, N) in micro-alloyed steel

Numerical Study on the Effects of Variable Mushy Zone Constants on Fluid Flow and Heat Transfer in Bloom Mold

Study on Secondary Phase Precipitation Behavior of Ship Plate Steel Slab Under Different Cooling Rates in Continuous Casting Process

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