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eutectic grain structure

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Image
Published: 01 December 2004
Fig. 15 Eutectic grain structure in flake graphite cast iron. Etching in Stead's reagent for 2.5 h (a) reveals coarse grains, for 1.5 h (b) shows fine grains. Magnification: 14×. Source: Ref 11 More
Image
Published: 31 August 2017
Fig. 5 Room-temperature eutectic grain structure in lamellar graphite iron. Original magnification: 14×. Source: Ref 10 More
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005301
EISBN: 978-1-62708-187-0
... explains how modification changes porosity formation in a casting. It describes the mechanisms responsible for silicon modification, as well as the modifications and changes in eutectic nucleation and the eutectic grain structure. The article reviews the usage of strontium in foundry practices. The growth...
Image
Published: 01 December 2008
Fig. 13 Structure of aluminum-silicon eutectic grains in three semisolid Al-7%Si alloys. (a) Unmodified. (b) Strontium modified. (c) Sodium modified. Source: Ref 42 More
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 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.a0003727
EISBN: 978-1-62708-177-1
... Abstract The most common aluminum alloy systems are aluminum-silicon, aluminum-copper, and aluminum-magnesium. This article focuses on the grain structure, eutectic microstructure, and dendritic microstructure of these systems. It provides information on microsegregation and its problems...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003725
EISBN: 978-1-62708-177-1
..., bainite, martensite, cementite, and ferrite. High-alloy steels may have an austenitic structure even after cooling to room temperature. An example is shown in Fig. 10 , for austenitic 18Ni-26Cr steel. Austenite grains surrounded by eutectic carbides are seen ( Ref 7 ). Fig. 9 Three stages...
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
... (1.2 in.) diameter bars showing columnar grains (primary austenite dendrites). Source: Ref 9 Fig. 5 Room-temperature eutectic grain structure in lamellar graphite iron. Original magnification: 14×. Source: Ref 10 Fig. 6 Pearlitic gray iron showing type A graphite and fine...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005331
EISBN: 978-1-62708-187-0
... on the stoichiometry of intermetallic phases, and control of solidification conditions. The article discusses the modification and grain refinement of aluminum-silicon alloys by the use of modifiers and refiners to influence eutectic and hypereutectic structures in aluminum-silicon alloys. It provides information...
Book Chapter

Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006225
EISBN: 978-1-62708-163-4
... Abstract This article begins with a schematic illustration of a eutectic system in which the two components of the system have the same crystal structure. Eutectic systems form when alloying additions cause a lowering of the liquidus lines from both melting points of the pure elements...
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
... interface during growth are illustrated. The article also describes the solidification structures of pure metals, solid solutions, eutectics, peritectics, and monotectics. constitutional undercooling curvature undercooling eutectics interface stability kinetic undercooling monotectics nucleation...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006559
EISBN: 978-1-62708-290-7
..., Al 2 O 3 and YAG precipitate simultaneously from these residual liquid phases, forming a eutectic structure. Due to the directional growth characteristics of the main Al 2 O 3 grains, these finally solidified low-melting eutectic phases are often extruded into a two-dimensional structure...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003723
EISBN: 978-1-62708-177-1
... practices cannot readily be made visible by metallographic methods, because the shape of the grains often remains equiaxed. X-ray diffraction can demonstrate this level of structure that lies beyond light microscopy. Fig. 2 Spiral morphology of Zn-MgZn 2 eutectic in a zinc-magnesium binary alloy...
Image
Published: 01 December 2004
Fig. 31 Alloy HF-33. (a) As cast. Austenite matrix contains eutectic carbide chains (at grain boundaries) and scattered carbide particles. Note the patch of lamellar constituent at a grain boundary. The globular inclusions are chiefly sulfide and silicate. (b) Creep-test specimen, a view More
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
... Abstract This article discusses the characterization of gray iron structures, following the sequence of structure formation, as it applies to unalloyed or low-alloyed gray iron. Austenite grains are the basic crystallographic entities of the metallic matrix in gray cast iron precipitated from...
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...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003781
EISBN: 978-1-62708-177-1
... exposures near room temperature, ε phase will continue to precipitate at grain boundaries and finally in the interior of the grains, ultimately forming T′ phase (ternary eutectic). When cold rolled, ε phase precipitates rapidly and abundantly in the cold-worked structure ( Fig. 13 ). In concentrations...
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
... graphite iron, as the carbon equivalent increases, the amount of equiaxed grains in the structure also increases. As discussed later, these grains include not only the primary austenite but also, in most instances, the eutectic austenite. Fig. 1 Macrostructure of cast iron bars showing primary...
Image
Published: 01 December 2004
Fig. 32 Alloy 5, UNS Z35531, die cast with rapid freezing, unetched. (a) Polarized light illumination shows grain size but not alloy phases. Grains are larger than primary crystallites in (b), indicating that the zinc grains extend into the eutectic. (b) Fine primary crystallites of solid More
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003790
EISBN: 978-1-62708-177-1
... of billet manufacture is by stirring solidifying metal mechanically or with magnetohydrodynamics (MHD). A second method is to extrude dendritic as-cast bar stock to refine the grain structure. This stress-induced melt-activation method (SIMA) is especially well suited in the manufacture of small-diameter...