Tree-ring formation during vacuum arc remelting of INCONEL 718: Part II. Mathematical modeling

Xu, Xiaolong; Zhang, W.; Lee, Peter

doi:10.1007/s11661-002-0189-z

Cited by 42 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Where pool length and mushy zone thickness at solidification tip are very sensitive for any change in heat extracting in mould region as has been stated in previous studies [19], and in the results below. The changes in heat flux are more significant at the upper half of the mould where the metal is partially liquid and the convective heat is more sensitive to cooling water temperature.…”

Section: Primary Coolingsupporting

confidence: 66%

Effect of Cooling Intensity and Position on Solidification in Semi-Continuous Casting of Copper

Hameed¹,

Mohammed²,

Fadhil³

2016

OJFD

View full text Add to dashboard Cite

Cooling heat flux effect in both primary and secondary cooling zone has been studied in semi-continuous casting of copper billet. Sufficient cooling is essential to reduce casting defects and to get high productivity, however low rate of solidification is aimed in order to get coarser grain size and softer metal for less losses in extrusion. A three-dimensional numerical model has been developed including solidification behavior of copper through mushy zone. At steady state and constant casting speed, solid shell thickness is monitored during the reduction of cooling rate at mould region to avoid breaking out. Heat flux intensity at mould plays important role not only in the formation of solid shell thickness. But, pool length and mushy zone thickness can be significantly increased by decreasing primary cooling intensity. Increase intensity of secondary cooling zone for two particular cases of primary cooling is tested. First case is tested at mould inlet water temperature of 38˚C, and second case at water temperature of 63˚C. Results showed that the combination of increasing secondary cooling intensity and reduction of primary cooling intensity can increase pool length and mushy zone thickness. Also, it is shown that, secondary cooling intensity can be magnified by up to 1.5 times for cooling water temperature of 63˚C to get pool length close to that of water temperature of 38˚C.

show abstract

Section: Primary Coolingsupporting

confidence: 66%

Effect of Cooling Intensity and Position on Solidification in Semi-Continuous Casting of Copper

Hameed¹,

Mohammed²,

Fadhil³

2016

OJFD

View full text Add to dashboard Cite

show abstract

“…[32] The thermophysical data used in the mesomodel, including nucleation and growth parameters, were derived from prior studies. [10] The entire morphology of the grain structure predicted by the VAR multiscale model, including crystallographic orientation, was transferred to the homogenization model, as described subsequently.…”

Section: Vacuum-arc Remeltingmentioning

confidence: 99%

“…[9] [10] where is the shear modulus, b is the Burgers vector, d o is the initial grain size, d DRX is the dynamically recrystallized grain size, and and o are the dislocation densities corresponding to the deformed and recrystallized regions, respectively. These relationships allow prediction of the microstructure based on the characteristic changes in flow stresses as a function of temperature and strain rate.…”

Section: E Forgingmentioning

confidence: 99%

“…On a microstructural level, good agreement of size, shape, and grain-size distribution was also achieved between the tree rings predicted by the multiscale VAR model with those observed experimentally by the electron backscattered diffraction technique. [10] Grain-structure predictions from the multiscale VAR model were used as the initial state of the heat-treatment model. Simulations of the predicted grain structure before and after a standard heat-treatment operation, consisting of 24 hours at 1160 °C followed by 72 hours at 1200 °C, are compared with the experimental observations in Figure 2.…”

Section: A Grain-structure Evolution During the Individual Processesmentioning

confidence: 99%

“…Although each of the separate stages has been modeled previously (e.g. VAR, [5][6][7][8][9][10][11] homogenization, [12,13,14] cogging, [15] and forging, [16,17] ), little effort has been directed toward integrated modeling of the full processing route. An integrated process model could be a powerful tool for optimizing production routes and engineering desirable properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Integrated modeling for the manufacture of Ni-based superalloy discs from solidification to final heat treatment

Tin

Lee

Kermanpur

et al. 2005

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

Process models of the various stages of gas-turbine disc manufacture have been integrated to simulate the physical and microstructural transformations occurring within a nickel-based superalloy throughout the entire manufacturing route. Production of these critical rotating structural components requires several distinct processing stages: vacuum-induction melting (VIM), vacuum-arc remelting (VAR), homogenization heat treatment, cogging, forging, final heat treatment, and machining. During the course of these consecutive manufacturing stages, the various thermal and thermomechanical processes lead to significant changes in both the microstructural characteristics and internal stresses in the alloy. Although separate models have previously been developed to simulate the individual processing stages, this article describes how these models, which are explicitly expressed in terms of the initial and evolving microstructure, can be integrated to simulate the entire manufacturing process from secondary melting through to the final forging and heat treatment. The grain structure predicted for one stage is explicitly transferred as the initial conditions for the model, which simulates the grain evolution during the next step. This information also provides the basis of microstructure-explicit constitutive equations describing the material behavior. Industrial-scale manufacturing trials associated with the production of an INCONEL alloy 718 aeroengine turbine disc were used to validate the integrated model for grain size. The model also allows intrinsic or extrinsic defects entrained within the material during the initial solidification stage to be tracked through the subsequent processes. This provides a basis for calculating the areas of discs likely to be vulnerable to such defects and whether they might be removed during machining. It was shown that the microstructure of the alloy changes significantly throughout the process chain, the final microstructure and defect distribution at each stage being related to those formed in the previous stages. There was good agreement between the model predictions and experimental observations for both the intermediate and final processing stages. The implications of such integrated modeling for quality assurance through process control are discussed.

show abstract

Motion Behavior of Ce‐Containing Inclusions in 8Cr4Mo4V‐Bearing Steel during Vacuum Arc Remelting

Pan,

Zhu,

Jiang

et al. 2024

steel research int.

View full text Add to dashboard Cite

Herein, the Ce‐containing inclusions in8Cr4Mo4V‐bearing steel are taken as the research objective to develop anumerical model of inclusions motions behavior. The model is validated bycomparing it with experimental data. During the vacuum arc remelting process, inclusions move along the molten pool's surface toward the edge under theaction of resultant force, and finally become trapped within the mushy zone. Notably, the majority of inclusions are concentrated near the ingot's edge, andtheir numbers decrease as the radial distance decreases. Furthermore, thenumber of Ce‐Mg‐O‐S inclusions exceeds that of Ce‐O‐S inclusions near the ingot's center. This discrepancy arises due to lower density of Ce‐Mg‐O‐Sinclusions, which exhibits a stronger tendency to migrate toward the moltenpool's center. Additionally, as the inclusion diameter increases, buoyancy forceacting on the inclusions increases, resulting in a higher number of inclusionsnear the ingot's center. When considering the effect of gas cooling, theinclusion distribution becomes more pronounced at the ingot's edge. This isattributed to the enhanced cooling capacity of the mold resulting in the decreasing of molten pool depth and consequently a stronger ability of themushy zone to trap inclusions.

show abstract

Tree-ring formation during vacuum arc remelting of INCONEL 718: Part II. Mathematical modeling

Cited by 42 publications

References 19 publications

Effect of Cooling Intensity and Position on Solidification in Semi-Continuous Casting of Copper

Effect of Cooling Intensity and Position on Solidification in Semi-Continuous Casting of Copper

Integrated modeling for the manufacture of Ni-based superalloy discs from solidification to final heat treatment

Motion Behavior of Ce‐Containing Inclusions in 8Cr4Mo4V‐Bearing Steel during Vacuum Arc Remelting

Contact Info

Product

Resources

About