The Change of Mushy‐Zone Length of a Nickel‐Based Single‐Crystal Superalloy During the Static‐Magnetic‐Field‐Assisted Directional Solidification

Published on Jun 1, 2018in Crystal Research and Technology1.169
· DOI :10.1002/CRAT.201700187
Chunlin Niu1
Estimated H-index: 1
(SHU: Shanghai University),
Weili Ren18
Estimated H-index: 18
(SHU: Shanghai University)
+ 2 AuthorsJianbo Yu11
Estimated H-index: 11
(SHU: Shanghai University)
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References19
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The effect of an axial magnetic field on the solidification structure in directionally solidified Ni-21.5Al-0.4Zr-0.1B (at. pct) alloy was investigated. The experimental results indicated that the application of a high magnetic field caused the deformation of dendrites and the occurrence of columnar-to-equiaxed transition (CET). The magnetic field tended to orient the 〈001〉 crystal direction of the equiaxed grains along the magnetic field direction. The bulk solidification experiment under a hig...
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We report the magnetic field dependence of the critical solidification rate for the stability of liquid-solid interfaces. For a certain temperature gradient, the critical solidification rate first increases, then decreases, and subsequently increases with increasing magnetic field. The effect of the magnetic field on the critical solidification rate is more pronounced at low than at high temperature gradients. The numerical simulations show that the magnetic-field dependent changes of convection...
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Abstract The evolution of microstructures at a wide range of solidification cooling rate in a Ni-based superalloy was investigated by employing conventional casting, spray casting and melt spinning processes. Depending on solidification cooling rate, microstructures sequentially show planar, cellular, dendritic, the dendritic growth suppressed features (in melt spinning process) and the shapes of γ′ precipitates progressively exhibit irregular (planar and cellular growth), cuboidal (dendritic gr...
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The effect of magnetic field on precipitation phases in directional solidified single-crystal nickel-base superalloy was investigated. The magnetic field significantly decreases the size of γ′ and the content of carbides and γ/γ′ eutectic. The decreased magnitude is firstly sharp and then gentle with the increasing magnetic field intensity. The γ′ phase refinement could be attributed to a decrease in nucleation activation energy during solid phase transformation. The segregation reduction of all...
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High magnetic field has been applied to the directional solidification of superalloy DZ417G. The results show that high magnetic field can significantly influence the primary dendrite arm spacing and microsegregation. A 6T magnetic field can decrease the primary dendrite arm spacing by 22% at a drawing speed of 40 mu m/s. Nevertheless, when the magnetic field is greater than 6T the primary dendrite arm spacing begins to increase. The microsegregation of Ti and Mo can be also decreased by about 2...
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AbstractThe effect of solidification rates on grain boundary (GB) cohesion in mushy zone during directional solidification was explored. The mushy zone structures were frozen by tin bath quenching. It was found that high solidification rate leads to an extended mushy zone thus vulnerable region, while there are larger areas where dendrites are bridged at higher solidification rate, i.e. there is a high fraction of bridging areas in the mushy zone as solidification rate is increased. The smaller ...
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