A Simplified Three-Phase Model of Equiaxed Solidification for the Prediction of Microstructure and Macrosegregation in Castings

Tveito, Knut Omdal; Pakanati, Akash; M’Hamdi, M.; Combeau, Hervé; Založnik, Miha

doi:10.1007/s11661-018-4632-1

Cited by 19 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conservation equations are then coupled using boundary conditions at phase interfaces, thereby requiring these interfaces to be accurately tracked. More recent implementations of these multiple domain models implement grain motion (Heyvaert et al, 2017;Tveito et al, 2018). This approach is computationally expensive for optimization searches.…”

Section: State Of the Fieldmentioning

confidence: 99%

directChillFoam: an OpenFOAM application for direct-chill casting

Lebon¹

2023

JOSS

View full text Add to dashboard Cite

Section: State Of the Fieldmentioning

confidence: 99%

directChillFoam: an OpenFOAM application for direct-chill casting

Lebon¹

2023

JOSS

View full text Add to dashboard Cite

“…Laboratory-scale experiments are often not representative of the industrial reality, and empirical industrial-scale testing is extremely costly and time-consuming. Therefore, numerical approaches are needed to address these intricate physical phenomena that arise throughout the casting process, allowing for a faster optimization of the casting conditions as well as the quantification of the interactions between and mutual influences of the different parameters [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Hot-Top Thermal Regime on the Severity and Extent of Macrosegregation in Large-Size Steel Ingots

Ghodrati,

Champliaud,

Morin

et al. 2024

JMMP

View full text Add to dashboard Cite

The influence of hot-top designs with different heat capacities on the distribution of positive and negative macrosegregation was investigated on a 12 metric tonne (MT) cast ingot made using Cr-Mo low-alloy steel. The three-dimensional finite element modeling code THERCAST® was used to simulate the thermo-mechanical phenomena associated with the solidification process, running from filling the mold until complete solidification. The model was validated on an industrial-scale ingot and then utilized to evaluate the influence of the thermal history of the hot-top, a crucial component in the cast ingot setup. This assessment aimed to comprehend changes in solidification time, temperature, and heat flux—all of which contribute to the determination of macrosegregation severity. The results showed that preheating the hot-top had a minor effect on solidification time, while modifications of thermal conductivity in the hot-top region increased the solidification time by 31%, thereby significantly affecting the macrosegregation patterns. The results are discussed and interpreted in terms of the fundamental mechanisms governing the kinetics of solidification and macrosegregation phenomena.

show abstract

“…The influence of the die wall will gradually weaken, and the grains will grow into parallel columnar crystals [2] along the vertical part of the die wall. In this way, there is no obvious directivity of heat dissipation in the middle of the casting [3], and it will also grow freely in all aspects until they contact each other, thus forming an equiaxed crystal zone [4]. In this case, the internal structure of the casting is uneven and the grains are relatively rough.…”

Section: Introductionmentioning

confidence: 99%

Effect of excitation vibration on mechanical property and stress corrosion resistance of cast steel

Shao,

Wang,

et al. 2023

J. vibroeng.

View full text Add to dashboard Cite

Cast steel parts can realize rapid prototyping effectively, which is suitable for complex structural design. However, due to the large residual stress, the problem of mechanical property degradation is more obvious. In order to solve this problem, a high temperature excitation vibration treatment scheme is proposed in this paper. By applying different excitation frequencies and impact forces, the effects of mechanical properties and stress corrosion properties are studied and verified. Based on the finite element software ANSYS, the modal shape and resonant frequency of the cast steel parts are obtained, and verified by the sweep frequency module in the excitation vibration system. According to the characteristics of modal shape, five typical detection paths are set, and stress sensors are arranged every 200 mm. In order to obtain the specific effects of excitation frequency and impact force amplitude on mechanical properties, nine parts samples were prepared on the same production line according to the matching requirements of test parameters. In addition, the main external parameters that remain unchanged during vibration excitation are set as initial 750 ℃ and vibration excitation time of 60 s, which can fully affect the effect of austenite transformation. Keeping the synchronization of test parameters in different samples, the distribution rules of residual stress under different excitation frequencies and forces are obtained and analyzed. In the aspect of mechanical properties, the microstructure, hardness, yield strength and tensile strength of the specimens subjected to vibration were compared and analyzed. In the aspect of stress corrosion performance research, stress corrosion cracking test was carried out in weak acid environment to obtain the tensile stress curve and fracture morphology of the specimen. The results show that the excitation vibration at high temperature can effectively eliminate the residual stress of cast steel parts, but the increase of excitation frequency does not correspond to the effect of residual stress elimination. When the exciting force exceeds a certain value, the stress relief effect cannot be further improved. Excitation vibration can reduce the internal hardness of cast steel parts to a certain extent, and improve the yield strength and tensile strength. At the same time, it has a positive role in promoting the improvement of stress corrosion resistance.

show abstract

A Simplified Three-Phase Model of Equiaxed Solidification for the Prediction of Microstructure and Macrosegregation in Castings

Cited by 19 publications

References 37 publications

directChillFoam: an OpenFOAM application for direct-chill casting

directChillFoam: an OpenFOAM application for direct-chill casting

Influence of the Hot-Top Thermal Regime on the Severity and Extent of Macrosegregation in Large-Size Steel Ingots

Effect of excitation vibration on mechanical property and stress corrosion resistance of cast steel

Contact Info

Product

Resources

About