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dendrite morphology

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Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006343
EISBN: 978-1-62708-179-5
... precipitated from the liquid melt. The article describes the macrostructure and dendrite morphology of primary austenite. Eutectoid transformation in the solid state causes the transformation of austenite to pearlite and/or ferrite, producing the as-cast structure. The article discusses the observations...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005518
EISBN: 978-1-62708-197-9
...Abstract Abstract This article reviews the various aspects of the simulation of solidification microstructures and grain textures. It describes the grain structures and morphology of dendrites or eutectics that compose the internal structure of the grains. A particular emphasis has been put...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003729
EISBN: 978-1-62708-177-1
... ). The final product of the computation can be ( Ref 1 ): Dendrite tip radius Solidification velocity Final number (size) of eutectic or dendritic grains in a volume element without graphical output (volume averaged) or with graphical output (grain envelope) Dendrite morphology Eutectic...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006304
EISBN: 978-1-62708-179-5
... with a discussion on the nucleation and growth of austenite dendrites. It describes the nucleation of lamellar graphite, spheroidal graphite, and austenite-iron carbide eutectic. The article reviews three main graphite morphologies crystallizing from the iron melts during solidification: lamellar (LG), compacted...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005223
EISBN: 978-1-62708-187-0
... and form a network. The solid fraction at which this phenomenon occurs depends on the dendrite morphology but will typically be 0.3 to 0.5 ( Ref 3 ). The choking mechanism is much more efficient in terminating melt flow, and fluidity is therefore low in alloys with long freezing ranges. Fig. 1...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005215
EISBN: 978-1-62708-187-0
.... The boundary between single and two-phase regions will mark an isoconcentration surface. Changing the solutionizing temperature will indicate the position of a range of isoconcentration surfaces. Serial sectioning can be used to determine the shape of isoconcentration surfaces and as-cast dendrite morphology...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006311
EISBN: 978-1-62708-179-5
... gradient G c/d . Both cellular and dendritic growth occurring from the wall in the direction opposite to the heat transport can be described as columnar growth. Fig. 14 Correlation between the thermal gradient at the interface and the interface morphology. Source: Ref 8 If constitutional...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005522
EISBN: 978-1-62708-197-9
... the basics of materials processing, that is, grain structure, dendrite morphology, mushy zone characteristics, columnar-to-equiaxed transition conditions, micro- and macrosegregation of chemical species, and so on, a number of topics have been included in the research program: eutectic, peritectic...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003724
EISBN: 978-1-62708-177-1
.... It takes place at a temperature gradient G c/d . Both cellular and dendritic growth occurring from the wall in the direction opposite to the heat transport can be described as columnar growth. Fig. 12 Correlation between the thermal gradient at the interface and the interface morphology. Source...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003727
EISBN: 978-1-62708-177-1
... alloys containing large amounts of eutectic, such as the aluminum-silicon alloys, depend more on the eutectic morphology and the dendrite arm spacing than on the grain size. Therefore, the modification of the brittle silicon phase from the eutectic is primarily used when processing aluminum-silicon...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005218
EISBN: 978-1-62708-187-0
... or transmission geometry and with a nonmonochromatic (white beam) or monochromatic radiation, where the combination of a white beam and transmission geometry normally would be preferred for in situ solidification studies. Other applications include studies of planar-cellular and cellular-dendritic morphology...
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
... conditions and are manifest in the microstructure through: Equiaxed/polygonal grains of diameter typically in the range of 20 to 50 μm and the absence of columnar/dendritic grain morphologies High levels of microstructural homogeneity and low levels of macrosegregation, regardless of position...
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
... is important in determining microsegregation patterns, and the dendrite tip temperature is critical in predicting the selection of dendritic structures over other (such as a eutectic) morphologies. (3) The concentration field ahead of the dendrite is required to evaluate the region of constitutional...
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 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...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003728
EISBN: 978-1-62708-177-1
... containing more than about 55 at.% Al ( Fig. 10c ). This indicates that the primary solidification path shifts from L → β to L → α and L → γ phase with increasing aluminum content ( Ref 26 ). These observations are in agreement with the previous observations of the dendritic morphology in shrinkage cavities...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003769
EISBN: 978-1-62708-177-1
...Abstract Abstract This article focuses on the metallography and microstructures of wrought and cast aluminum and aluminum alloys. It describes the role of major alloying elements and their effect on phase formation and the morphologies of constituents formed by liquid-solid and/or solid-state...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005609
EISBN: 978-1-62708-174-0
... be a wide range of substructural morphologies within the grains ( Fig. 2 ), including planar (i.e., no substructure), cellular, columnar dendritic, and equiaxed dendritic. The type and relative extent of each substructural region is governed by the process of constitutional supercooling in which the liquid...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005220
EISBN: 978-1-62708-187-0
... ( Fig. 6 ), while others have a dendritic morphology that may be assumed to be a shrinkage pore ( Fig. 6 ). Clearly, the round pores have nucleated early while still surrounded by liquid, but the dendritic pores have formed late, after the dendrites have formed. These differences in the time of pore...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005511
EISBN: 978-1-62708-197-9
..., one-dimensional (1-D) microscopic models were first developed to analyze the microsegregation and solidification path in multicomponent alloys ( Ref 73 , 74 , 75 ). In the models, the dendrite morphology is usually assumed to be plate, cylinder, or sphere having a length scale of half the secondary...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005521
EISBN: 978-1-62708-197-9
... the dendritic morphology. In addition to the phase distributions, the composition and temperature are fully determined as a result of the simulation. Fig. 3 Direct modeling of solidification dendritic structure is characterized by full access to the topology of the phases. This is possible by using...