Hot Tearing in Steels During Solidification: Experimental Characterization and Thermomechanical Modeling

Cerri, Olivier; Chastel, Yvan; Bellet, Michel

doi:10.1115/1.2870233

Cited by 13 publications

(9 citation statements)

References 9 publications

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“…However, the steady-state approximation cannot tackle the transient phenomena that occur during continuous casting. The shell compression and tension are the provenance of the cracks and the hot tearing formation [23]. As recently revealed, the interaction of the highly conductive shell with the induced electric current during electromagnetic brake leads to the complex topology of the Lorentz force and to the complete alternation of the melt flow pattern [24][25][26].…”

Section: List Of Symbolsmentioning

confidence: 99%

Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold

Vakhrushev

Kharicha

et al. 2022

J. Iron Steel Res. Int.

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A funnel-type mold is commonly used to provide necessary clearance for the submerged entry nozzle in the thin slab casting (TSC). The partially solidified shell is subjected to the mechanical deformations, which can lead to the defects formation and, as a results, to a breakout. Traditionally, the results of the flow simulation, performed by the finite volume method (FVM), are fed to the external package for the finite element analysis of stress and strain. A coupled model was assembled using “creeping solid” approach by blending the Norton-Hoff viscoplastic stress for the solidifying shell with the Newtonian viscous stress of the liquid melt. The FVM was used to combine both liquid and solid stress models within a single solver. The iterative procedure based on the improved both side diffusion method was introduced to treat the nonlinear relation between the viscoplastic stress and the strain rate. The modeled shell thickness was verified by previously published breakout measurements and the simulation results. Temperature distribution, obtained during the TSC simulation, dominantly corresponds to the viscoplastic range. Developed numerical approach is robust and has direct industrial application.

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Section: List Of Symbolsmentioning

confidence: 99%

Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold

Vakhrushev

Kharicha

et al. 2022

J. Iron Steel Res. Int.

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“…Al-Si 合金是一种用途较广的金属材料，具有良好的铸造性能、机械加工性能以及力学性能等 [1][2][3][4]。包括 Al-Si 在内的诸多铝合金在凝固过程中往往会出现热裂现象，这是一种较严重的铸造缺陷 [5][6][7][8]，热裂通常沿着晶界分布 [9]。有关铝合金热裂形成的原因，主要认为是因为合金后期凝固中，由于补缩不足，垂直于枝晶生长方向受到拉应力应变作用，导致合金开始出现裂纹 [10]。热裂严重影响铸件的质量。因此，热裂纹是工业生产中急需解决的一个问题。近年以来，研究人员开始寻找能够预判铸件热裂状况的判据，并将这些判据应用于各类合金的凝固成型过程中，取得了一定的效果。例如，Clyne 等 [11]认为当合金的固相体积分数在 0.9～0.99…”

Section: 引言unclassified

Effect of Composition on Crack Susceptibility Index of Al-Si and Al-Si-Mg Alloys

Luo

Liu

et al. 2023

mater

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In order to reasonably design the composition of Al-Si based alloy and study the effect of alloying elements on hot crck of Al-Si based alloys, the effect of alloying elements on hot cracking of Al-Si based alloy was studied. The influence of different Si contents on the crack susceptibility index (CSI) of Al-Si alloy was calculated by using Pandat, and the influence of Mg addition on the CSI of the Al-Si-Mg alloy was also calculated. The solidification path affecting the CSI of the alloy was analyzed. The results show that when the Si content is below 10% (mass percentage), the CSI is almost non-existent and the Al-Si alloy will not show crack tendency; When the Si content reaches 11~12%, the CSI of the Al-Si alloy is very small. When the Si content reaches the hypereutectic region (Si ≥ 13%), the CSI of the Al-Si alloy begin to increase with increasing of Si content. The crack tendency of the Al-Si alloy in the hypereutectic region is larger. Adding Mg can effectively reduce the CSI of the alloy. Furthermore, with increasing of Mg content, the CSI of Al-Si-Mg alloy gradually decreases.

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“…The calculated f s at this point was given with 0.8. [ 16 ] Cracks, that occur in the LDZ1 and show a dendritic structure at the fracture surface, are referred to as “hot tearing.” [ 17–19 ]…”

Section: Reduction Of Cross‐sectional Area and Ductility Influencing ...mentioning

confidence: 99%

“…[16] Cracks, that occur in the LDZ1 and show a dendritic structure at the fracture surface, are referred to as "hot tearing." [17][18][19] The LDZ2 defines the second temperature range where the ductility is impaired by mechanisms inside the steel, starting with the ductile-brittle transition at T DB . In case, the deterioration starts because of the formation of secondary MnS or low melting FeS, it is referred to as LDZ2a, whereas LDZ2b is induced by the precipitation of nitrides.…”

Section: Reduction Of Cross-sectional Area and Ductility Influencing ...mentioning

confidence: 99%

Investigations on Decreased High Temperature Ductility of Different Continuously Cast Steel Grades

Fix

Borrmann²,

Elixmann³

et al. 2021

steel research int.

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Continuous casting of premium steel grades requires a process with a high degree of precision and the knowledge about the mechanical behavior of the steel at temperatures above 800 C. Herein, several origins of effects which lead to unwanted impairment of the hot strand shell like segregations, size, amount, kind, and distribution of precipitates as well as porosities from a metallurgical point of view are dealt. The systematic description of potential defect reasons helps to predict harmful operation parameters in context with the chemical composition of steel grades. A compilation of results from experiments at Department of Ferrous Metallurgy of RWTH Aachen University is complemented by a literature review. It is focused on the high temperature ductility and the underlying mechanisms inside the solidifying steel. Finally, potential measures to adjust the continuous casting process to prevent defects are elaborated.

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Hot Tearing in Steels During Solidification: Experimental Characterization and Thermomechanical Modeling

Cited by 13 publications

References 9 publications

Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold

Norton-Hoff model for deformation of growing solid shell of thin slab casting in funnel-shape mold

Effect of Composition on Crack Susceptibility Index of Al-Si and Al-Si-Mg Alloys

Investigations on Decreased High Temperature Ductility of Different Continuously Cast Steel Grades

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