Effect of liquid–solid pouring on the as-cast structure and the distribution of nonmetallic inclusions in a 24.2-t steel 38KhN3MFA ingot

Rutskii, D. V.; Gamanyuk, S. B.; Zyuban, N. A.; Petrova, V. F.; Palatkina, L. V.

doi:10.1134/s0036029517050093

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…They were located in the ingot wall side, radial midway and center (Regions 1, 2 and 3 in Figure 1b), representing the solidified regions in the initial, intermediate and final stages of the solidification process. This section was chosen to reduce the effect of defects encountered in the hot-top, which could influence dendrite evolutions [18]. The axial faces of the three regions were first chemically characterized with the Thermo Scientific ARL TM 4460 mass spectrometer.…”

Section: Experimental and Modeling Processesmentioning

confidence: 99%

On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot

Zhang

Jahazi

Gallego

2020

Metals

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The impact of microsegregation models on thermophysical properties and solidification behaviors of a high strength steel was investigated. The examined microsegregation models include the classical equilibrium Lever rule, the extreme non-equilibrium Scheil-Gulliver, as well as other treatments in the intermediate regime proposed by Brody and Flemings, Clyne and Kurz, Kobayashi and Ohnaka. Based on the comparative analyses performed on three representative regions with varied secondary dendrite arm spacing sizes, the classical equilibrium Lever rule and non-equilibrium Scheil scheme were employed to determine the thermophysical features of the studied steel, using the experimentally verified models from literature. The evaluated thermophysical properties include effective thermal conductivity, specific heat capacity and density. The calculated thermophysical data were used for three-dimensional simulation of the casting and solidification process of a 40 metric ton steel ingot, using FEM code Thercast®. The simulations captured the full filling, the thermo-mechanical phenomena and macro-scale solute transport in the cast ingot. The results demonstrated that Lever rule turned out to be the most reasonable depiction of the physical behavior of steel in study in large-size cast ingot and appropriate for the relevant macrosegregation simulation study. The determination of the model was validated using the experimentally measured top cavity dimension, the thermal profiles on the mold outside surface by means of thermocouples, and the carbon distribution patterns via mass spectrometer analysis.

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Section: Experimental and Modeling Processesmentioning

confidence: 99%

On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot

Zhang

Jahazi

Gallego

2020

Metals

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Mathematical Model Approach to the Solidification of Different Geometry Ingots and the Development of Shrinkage Defects in them

Rutsky

Zyuban

Gamanyuk

2019

MSF

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A mathematical modeling approach as well as experimental data analysis have made it possible to establish significant factors affecting the relative diameter of the axial porosity zone. The minimal values of this parameter determine if the ingot can be used for the fabrication of rolled steel rods over 300 mm in diameter, because chill extensive axial defects prevent from producing high quality bars of a large diameter. Commercial information analysis and experimental results have enabled to develop a model relating the axial porosity zone dimension, ingot geometry and process parameters of teeming 6.61 ton and 7.0 ton ingots. The improvement of the model obtained has enabled to establish that the axial porosity zone is primarily affected by the following factors: hot top size, slenderness ratio, the H/D ratio and insulation heat capacity. When these parameters are controlled to reduce the relative diameter of the axial porosity zone, the number of shrinkage defects decreases and the quality of large diameter rolled steel becomes better. The proposed ingot geometry improves the direction of the advance of the metal solidification front to the ingot thermal center, located in the hot top. Besides, the solidifying metal is better fed with the hot top melt.

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Effect of liquid–solid pouring on the as-cast structure and the distribution of nonmetallic inclusions in a 24.2-t steel 38KhN3MFA ingot

Cited by 2 publications

References 1 publication

On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot

On the Impact of Microsegregation Model on the Thermophysical and Solidification Behaviors of a Large Size Steel Ingot

Mathematical Model Approach to the Solidification of Different Geometry Ingots and the Development of Shrinkage Defects in them

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