Modelling of macrosegregation in a 231-ton steel ingot with multi-pouring process

Tu, Wutao; Shen, Houfa; Liu, B. C.

doi:10.1179/1432891715z.0000000001517

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…To solve the above problems, researchers have proposed a number of technical means to improve the solidification structure of large ingots. For example, Multilayer additive hot-compression bonding technology [16,17], Multi-Packing pouring technology [18][19][20], Electroslag [38] remelting technology [21], Hollow ingot technology [22]. These technologies have improved the defects of large ingots to a certain extent, but there are also some limitations.…”

Section: Introductionmentioning

confidence: 99%

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

Wang

Shuai

et al. 2023

Materials Science and Technology

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A novel method by adding inorganic heat absorption material (IHAM) into the molten steel was proposed to improve the quality of large steel ingots. The IHAM was found to melt and float up after absorbing the heat of molten steel, stirring the melt and thus accelerating the cooling process. The molten steel was also purified as the inclusions were adsorbed during the floating of IHAM. The addition of IHAM rod was conducive to increase the equiaxed grain ratio (EGR) and alleviate the central carbon segregation, while the IHAM cored wire played a more important role in reducing the inclusion index. This method holds broad appeal to solidification of large steel ingot, as it can improve the microstructure of solidified ingot.

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Section: Introductionmentioning

confidence: 99%

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

Wang

Shuai

et al. 2023

Materials Science and Technology

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“…In order to achieve high quality large-size cast ingots, a better understanding of the influence of chemical composition and process parameters is needed in order to be able to take measures for minimizing the extent and intensity of macrosegregation. The measures commonly taken include control of chemical compositions (reduction of Mn and Si contents) [5], improvement in mold geometry [6,7], optimisation of casting process (control of melt temperature, mold preheating temperature, filling rate) [8,9], employment of engineering solution (intensive rapid cooling, mechanical vibration and electromagnetic stirring) [10,11], and application of multipouring technique (sequential pouring of molten steel from multiple ladles with different concentrations of alloying elements) [12]. Among the above strategies, superheat control is one of the simplest methods to implement.…”

Section: Introductionmentioning

confidence: 99%

Simulation and experimental validation of the effect of superheat on macrosegregation in large-size steel ingots

Zhang

Jahazi

Tremblay

2020

Int J Adv Manuf Technol

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A 3D model was employed to study the effect of melt initial superheat on the macrosegregation formation using FE modeling and experimentation methods. The casting process of three ingots with the initial melt superheats of 75°C, 65°C and 55°C were simulated. The three cases represented three variables encountered in industry during casting of large size ingots. For the above three studied cases, all other casting conditions were kept the same. Results showed that the variation of initial melt superheat gave rise to changes in temperature pattern, liquid flow field, solidification speed, and thermomechanical contraction. Under the combined actions of all these changes, lower superheat tended to alleviate the segregation intensity in the upper part of the ingot body, in the hot-top, and in the solute-rich bands between the ingot centerline and periphery. The beneficial effect of lower superheat on alleviation of segregation severity was confirmed by experimental chemical measurement results. The results were analyzed in terms of heat and mass transfer theories and allow for a better understanding of the underlying mechanisms responsible for the occurrence of macrosegregation in ingot casting process. The findings should be helpful for the casting process design of a given ingot of high value-added steels or other alloys.

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A Homogenization Technology for Heavy Ingots: Hot-Top Pulsed Magneto-Oscillation

Zhong,

Zhou,

Yuan

et al. 2024

Metall Mater Trans B

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Modelling of macrosegregation in a 231-ton steel ingot with multi-pouring process

Cited by 8 publications

References 14 publications

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

Improving microstructure and segregation of steel ingot by inorganic heat absorption method

Simulation and experimental validation of the effect of superheat on macrosegregation in large-size steel ingots

A Homogenization Technology for Heavy Ingots: Hot-Top Pulsed Magneto-Oscillation

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