Effect of the Geometry of an Ingot on its Chemical Heterogeneity. Part I

Дуб, В. С.; Romashkin, A. N.; Mal’ginov, A. N.; Иванов, И. А.; Tolstykh, D. S.

doi:10.1007/s11015-014-9834-1

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The pioneering work of Flemings et al, developed in the 1960s [4,5], set the theoretical bases for studying the mechanisms of macrosegregation. Since then, intensive research has been underway, and some critical process parameters have been identified and used as 'countermeasures' to produce sound ingots with improved quality and limited macrosegregation [6][7][8][9]. Specially, stringent control of the superheat [7], accelerating the solidification process in the mold [8], and improving ingot dimensions and configurations [9] have been investigated experimentally and numerically by researchers.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Filling Rate on Positive Macrosegregation Patterns in Large Size Cast Steel Ingots

et al. 2018

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The effect of filling velocity on positive macrosegregation in large size steel ingots was studied. Macrosegregation and macro/microstructures were characterized on the hot-tops and a portion of the upper section of two ingots. The measurements revealed that segregation features in the two ingots varied as a function of the alloying elements, and that the severity of positive macrosegregation in the casting body was reduced when the filling rate was increased. It was also found that at the higher filling rate, grain morphologies in the first solidified zones of the ingot changed from columnar to equiaxe, and secondary dendrite arm spacing (SDAS) became slightly smaller in the intermediate and final solidified zones. The experimental findings were analyzed in the framework of diffusion and convection-controlled solidification, as well as liquid metal flow theories. The solute dependence of segregation features was related to the difference in the solid-liquid partition coefficient and diffusion capability of each element in the liquid iron. Calculation of Reynolds numbers (Re) during the filling process, for both ingots, showed that higher filling velocity caused more instable movement of the liquid metal in the initial solidification stage, resulting in the modification of grain morphology, as well as accelerated solidification rate.

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Section: Introductionmentioning

confidence: 99%

On the Effect of Filling Rate on Positive Macrosegregation Patterns in Large Size Cast Steel Ingots

et al. 2018

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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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“…Such non-uniformities may induce different solidification patterns, thereby affecting macrosegregation severity and extent in the cast ingots. However, the effect of different casting spatial configurations on the solidification properties is still not clear and needs to be quantified [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Non-Uniform Temperature Distribution of the Mold on Solidifcation Behavior in Large-Sized Steel Ingots

Zhang¹,

Loucif²,

Tremblay³

et al. 2019

The 8th International SteelSim Conference

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Effect of the Geometry of an Ingot on its Chemical Heterogeneity. Part I

Cited by 4 publications

References 1 publication

On the Effect of Filling Rate on Positive Macrosegregation Patterns in Large Size Cast Steel Ingots

On the Effect of Filling Rate on Positive Macrosegregation Patterns in Large Size Cast Steel Ingots

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

Influence of Non-Uniform Temperature Distribution of the Mold on Solidifcation Behavior in Large-Sized Steel Ingots

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