Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field

Xu, Lei; Wang, Jun; Zhang, Jiao; Han, Yanfeng; Xi, Li

doi:10.3390/ma8063428

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…The presented in this study results show similar value of the area fraction of the (γ + γ') eutectic in CMSX-6 directionally solidified superalloy to that presented in Ref. [10]. The experimental results discussed in [11] show that the sizes of the eutectic pools decreased as the solidification rate increased.…”

Section: Discussionsupporting

confidence: 86%

Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

Szczotok

2017

Archives of Metallurgy and Materials

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Microstructural characterization is an important tool to optimize the properties of engineering materials. Quantitative metallography is a common technique, which provides three-dimensional estimations of phases and structure elements from two-dimensional images. Metallography has been described as both a science and an art [1].Superalloys are high-performance alloys which exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Temperature and corrosion resistant materials such as nickel-based superalloys are prepared mostly with standard metallographic techniques. However, the results can be significantly improved by using finely graded CMP (chemical mechanical polish) polishing solutions on a high napped polishing pad.Sample preparation requires a certain degree of skills and experience, due to the high chemical resistance of most superalloys. Some chemical solutions are able to dissolve theγmatrix and recover theγ'residue, and some others solutions can be used to obtain a contrary effect – dissolve theγ'phase precipitates and recover theγmatrix residue. The aim of the presented research is to describe qualitatively and quantitatively the as-cast microstructure of CMSX-6 SC superalloy. The author’s attention has been concentrated on theγ'phase precipitates morphology. The results of using optical and scanning electron microscopy (SEM) are presented.

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Section: Discussionsupporting

confidence: 86%

Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

Szczotok

2017

Archives of Metallurgy and Materials

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“…Following that, some researchers have also applied a WTSMF to the DS of SX superalloys. Li et al [25] showed that a 0.5 T WTSMF used in the DS of CMSX-6 superalloy could cause extensive macrosegregation in the mushy zone and decrease the size of γ′ phase. Xuan et al [26] also studied the effect of WTSMF on stray grain defects and found that the WTSMF obviously suppressed the stray grain on the side where the primary dendrite diverges from the mold wall.…”

Section: Introductionmentioning

confidence: 99%

Tailoring Microstructure and Microsegregation in a Directionally Solidified Ni-Based SX Superalloy by a Weak Transverse Static Magnetic Field

Zhao

Fan

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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A weak transverse static magnetic field (WTSMF, 0-0.5 T) is applied to the directional solidification process of a DD3 Ni-based SX superalloy, aiming to tailor the microstructure and microsegregation of alloys. The mechanisms of microstructural refinement and microsegregation distribution caused by a WTSMF during directional solidification are discussed. It is shown that the primary dendrite arm spacing is rapidly reduced from 181 to 143 μm, and the average size of γ′ phase is significantly refined from 0.85 to 0.25 μm as the magnetic field increases from 0 to 0.5 T. At the same time, the volume fractions of γ/γ′ eutectic and the segregation coefficient are also gradually decreased. The 3D numerical simulations of the multiscale convection in liquid phase show that the modifications of the microstructure and microsegregation in DD3 are mainly attributed to the enhanced liquid flow caused by thermoelectric magnetic convection (TEMC) at dendrite/sample scale under the WTSMF. The maximum of the TEMC increases with increasing the magnetic field intensity. This work paves a simple way to optimize the microstructure and microsegregation in directionally solidified Ni-based SX superalloys without changing the processing parameters and composition.

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“…12 Most of the cited studies were carried out on alloys where the solute density was higher than in the bulk liquid, hence solute plumes do not spring from the interface; however, similar changes are also observed in systems where the solute is the lighter element. [11][12][13] Most of these studies use post mortem analysis of the final https://doi.org/10.1007/s11837-020-04305-2 Ó 2020 The Author(s) solidified structures to investigate the changes in order to understand the associated mechanisms. Dynamic in situ observations can provide further insights into the underlying physics of the process; for example, in previous work, the authors investigated the formation of large-scale channels through a joint experimental and numerical approach, using the analogous Ga-25 wt%In system.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Effects on Microstructure and Solute Plume Dynamics of Directionally Solidifying Ga-In Alloy

Kao

Shevchenko

et al. 2020

JOM

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The effects of applying a 0.2-T transverse magnetic field on a solidifying Ga-25 wt%In alloy have been investigated through a joint experimental and numerical study. The magnetic field introduced significant changes to both the microstructure and the dynamics of escaping high-concentration Ga plumes. Plume migration across the interface was quantified and correlated to simulations to demonstrate that thermoelectric magnetohydrodynamics (TEMHD) is the underlying mechanism. TEMHD introduced macrosegregation within the dendritic structure, leading to the formation of a stable “chimney” channel by increasing the solutal buoyancy in the flow direction. The resulting pressure difference across the solidification front introduced a secondary hydrodynamic phenomenon that subsequently caused solute plume migration.

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Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field

Cited by 8 publications

References 14 publications

Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy

Tailoring Microstructure and Microsegregation in a Directionally Solidified Ni-Based SX Superalloy by a Weak Transverse Static Magnetic Field

Magnetic Effects on Microstructure and Solute Plume Dynamics of Directionally Solidifying Ga-In Alloy

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