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macrosegregation

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Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005216
EISBN: 978-1-62708-187-0
... Abstract Macrosegregation refers to spatial compositional variations that occur in metal alloy castings and range in scale from several millimeters to centimeters or even meters. This article presents a derivative approach for understanding the mechanism of macrosegregation induced by flow...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005237
EISBN: 978-1-62708-187-0
... Abstract In order to model macrosegregation, one must consider convection and the partitioning of segregating elements at the dendritic length scale. This article describes microsegregation with diffusion in the solid. It presents a continuum model of macrosegregation and illustrates...
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Published: 01 December 2008
Fig. 5 Simulated fluid flow at 50 s after cooling and macrosegregation in an Fe-0.25C specimen More
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Published: 01 December 2008
Fig. 6 Macrosegregation observed along Z -direction (cross-sectional mean value) for an Fe-0.25C specimen More
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Published: 01 December 2008
Fig. 9 Typical macrosegregation observed in steel ingots More
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Published: 01 December 2008
Fig. 12 Sulfur print showing centerline macrosegregation in a continuously cast steel slab More
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Published: 01 December 2008
Fig. 3 Simulated macrosegregation of oxygen after 8700 s in the vacuum arc remelted slab ingot. Dimensions are in centimeters. More
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Published: 01 November 2010
Fig. 5 Development of macrosegregation in an alloy with interdendritic liquid lighter than nominal. (Lighter shade of     gray indicates liquid of higher-than-nominal composition; darker regions are depleted in solute. The white lines are the liquidus interface, the solid black lines More
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Published: 01 November 2010
Fig. 6 Dependence of global macrosegregation levels in ten-component steel (all data from two cases in Ref 44 ). Each point represents the macrosegregation level, M , of an individual component as a function of its partition coefficient, k . The two data sets were predicted under the same More
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Published: 01 November 2010
Fig. 27 Macrosegregation for directional solidification of a Pb-10Sn binary alloy. (a) Final tin composition after solidification. (b) Cut-off view of it More
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Published: 01 January 2005
Fig. 6 Macrosegregation in a large steel ingot. Source: Ref 1 More
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Published: 30 November 2018
Fig. 13 Radiograph showing macrosegregation in a section of A319 cylinder-head casting. Courtesy of J.F. Major, Rio Tinto Alcan, Kingston, Ontario More
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006496
EISBN: 978-1-62708-207-5
... is on the chemical segregation that occurs during freezing, because it determines the castability of the alloy. The article describes the two types of segregation, namely, microsegregation and macrosegregation. It discusses the effect of freezing range on castability of an alloy. The article lists the freezing range...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005501
EISBN: 978-1-62708-197-9
... several commonly used microstructure simulation methods and presents ductile iron casting as an example to demonstrate the ability of microstructure simulation. The predictions for the major defects of casting, such as porosity, hot tearing, and macrosegregation, are highlighted. Finally, several industry...
Book Chapter

By P.S. Grant
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005225
EISBN: 978-1-62708-187-0
... process as a function of axial distance from the point of droplet atomization. The article concludes with information on the occurrence of macrosegregation and coarsening in spray cast preforms. coarsening gas atomization macrosegregation microsegregation spray casting probability density...
Book Chapter

Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003978
EISBN: 978-1-62708-185-6
... and practice of open-die forging, with some practical examples. The article illustrates macrosegregation in a large steel ingot and lists the forgeable alloys. It reviews the physical and mathematical models used in deformation modeling. The article explains the contour forging and roll planishing process...
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Published: 01 December 2008
of approximately 5 mm/s, or 0.2 in./s) and solid fraction contours (in five equal intervals of 20%, starting with 0% for the uppermost contour at approximately midheight). (b) Macrosegregation pattern. The gray shades indicate the titanium concentration, with the darkest shade inside the open channels in the mush More
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005525
EISBN: 978-1-62708-197-9
... the liquid velocities generated can be quite small and have less effect on macrosegregation than buoyancy (see Ref 17 for a scaling analysis of this issue and Ref 18 and 19 for some exceptions), the attendant volume change can cause the casting to pull away from the mold wall, and the pressures induced...
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Published: 01 November 2010
Fig. 24 Effect of grain movement and different nucleation rates on predicted macrosegregation patterns in equiaxed dendritic solidification of Al-4Cu (wt%) alloy with grain movement inside 5 × 10 cm rectangular cavity cooled from left sidewall. Source: Ref 38 More
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Published: 01 November 2010
Fig. 25 Solidification of a single-crystal nickel-base superalloy. (a) Predicted velocity vectors (largest vector represents 6.3 mm/s) and solid fraction contours (in 20% increments). (b) Macrosegregation pattern (titanium concentration normalized by initial concentration in equal intervals More