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segregation pattern

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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
... domain of the VAR slab ingot produces segregation patterns that are qualitatively similar to Fig. 3 . The simulation with the finer elements shows somewhat less segregation, and the segregated bands are a little wider. The simulations were also carried out to complete solidification. Because of the...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005420
EISBN: 978-1-62708-196-2
... stirring is used, these forces require modeling the applied magnetic field. Another challenge is to incorporate the effects of turbulence. Computationally-efficient choices include simple “mixing-length” models, the two-equation models such as k-ε to simulate the time-average flow pattern. Large-eddy...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001831
EISBN: 978-1-62708-181-8
... the major stress direction. The continual straining of the free surfaces of the dimples as the microvoids enlarge produces slip-plane displacement at the surface of the dimple ( Ref 6 ), as shown in Fig. 9 . When first formed, the slip traces are sharp, well defined, and form an interwoven pattern...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005277
EISBN: 978-1-62708-187-0
... pattern of castings produced from permanent molds such as gravity dies (permanent molds) and low-pressure dies may be considerably affected by the thickness and type of die coat that is applied. A system to monitor and control such thickness on an SPC system must be in place. Alternatively, for each...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005201
EISBN: 978-1-62708-187-0
... and discusses the major components and operations of the ESR furnaces. It describes the principles of ingot solidification and various defects of remelted ingot such as tree ring patterns, freckles, and white spots. The article explains several variations of ESR such as pressure electroslag remelting...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003045
EISBN: 978-1-62708-200-6
... reviews the important quality control techniques used during the manufacture of composite components by analyzing tooling control, material control, pattern orientation control, and in-process control. composite components equipment design in-process control material control nondestructive...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001243
EISBN: 978-1-62708-170-2
... control, equipment, surface preparation, and crack patterns and other characteristics of hard chromium plating. It offers recommendations for the design and use of plating racks, describes the problems encountered in hard chromium plating, and their corrective procedures. The article provides information...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005210
EISBN: 978-1-62708-187-0
... directional solidification, important lengths are the tip radius, R , the primary spacing, λ, the secondary spacing, λ 2 , and the length of the dendrite in the two-phase region, or the extent of the mushy zone, ℓ. The formation of a nonplanar interface causes solute segregation patterns, since the solid...
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
...-induced macrosegregation is given by the V-segregates in the equiaxed region of tall steel ingots. This macrosegregation pattern is also illustrated in Fig. 10 and consists of rodlike solute-rich streaks that appear periodically along the centerline. The V-segregates arise from equiaxed crystals...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005236
EISBN: 978-1-62708-187-0
..., distinct by composition and atomic structure. Within one grain metallic alloys also show a microstructure caused by segregation patterns due to the dendritic growth instability of the growth front. Figure 1 presents a longitudinal cross section of a 0.17 m (7 in.) Al-7wt%Si cylindrical ingot. The grain...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005406
EISBN: 978-1-62708-196-2
.... The microstructure of a casting can consist of different grains of the same thermodynamic phase, distinct by orientation, or different phases of one alloy, distinct by composition and atomic structure. Within one grain metallic alloys also show a microstructure caused by segregation patterns due to...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005295
EISBN: 978-1-62708-187-0
... patterns follow the configuration of the inside cavity of the ingot mold and are further influenced by the hot top. Typical solidification of an 81 cm (32 in.) square BEU hot-topped ingot is shown in Fig. 10 . Fig. 10 Solidification patterns in an 81 cm (32 in.) square bottom-end-up hot-topped ingot...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005208
EISBN: 978-1-62708-187-0
... arms, the limited transport of solute in the solid, combined with rapid transport in the liquid, leads to the Scheil equation for microsegregation. Finally, the principles of transport and scaling are applied to homogenization processes to ameliorate the undesirable segregation pattern. The...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005437
EISBN: 978-1-62708-196-2
... ameliorate the undesirable segregation pattern. This article originally appeared as “Transport Phenomena During Solidification,” by J.A. Dantzitg, Casting , Vol 15, ASM Handbook , ASM International, 2008, p 288–292. The derivation of the general forms of the balance equations is given in Ref 1 and 2...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004024
EISBN: 978-1-62708-185-6
... techniques Process/ property CAFÉ 3D KELTOOL NCC tooling HIP RSP tooling Preform Pattern in negative form RTV transfer mold Electroformed Ni on mandrel Ceramic preforms Preheated ceramic pattern Backing material Composite Al filled epoxy A6 tool steel and tungsten carbide slurry...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006655
EISBN: 978-1-62708-213-6
... conditions from these rows of atoms. The diffraction pattern and the intensity distribution in the diffracted beams can provide information on the positions of atoms in the surface and on the existence of various crystallographic defects in the periodic arrangement of surface atoms. In its most elementary...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005252
EISBN: 978-1-62708-187-0
... shell molding and green sand molding. casting dimensional accuracy green sand molding shell molding tensile strength mold cracking soft molds peelback mold shift shell coremaking sand reclamation resin-sand properties mold defects mold patterns THE SHELL PROCESS was first...
Book Chapter

Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005202
EISBN: 978-1-62708-187-0
..., as opposed to continuous defects. Solute-lean (negative segregation) defects are not inherently as detrimental to the properties of a component as are defects resulting from positive segregation. Types of ingot defects include: Tree ring patterns Freckles White spots Tree ring...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003250
EISBN: 978-1-62708-199-3
... between the ∼1 cm range of “bulk XRF” and the ∼1 μm scale of electron probe microanalysis, for example, characterizing segregation patterns in cross-sectioned ingots. Optical emission spectroscopy (OES) operates on the same atomic principles but bases its analyses on visible light, rather than x-rays...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003172
EISBN: 978-1-62708-199-3
..., subclassifications can be developed from patterns, (i.e., whether or not the patterns are expendable). For permanent molding, processes can be classified by the type of mechanism used to fill the mold. Table 1 provides one possible classification system for commonly employed molding and casting processes...