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directional solidification

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Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006266
EISBN: 978-1-62708-169-6
..., but each grain is elongated along the solidification axis. In the case of an SCDS casting, a single grain occupies the component space. Due to the alignment of grains, a CGDS alloy tested in the longitudinal (airfoil axis) direction develops longer rupture life than its PC cast counterpart. The SCDS...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005213
EISBN: 978-1-62708-187-0
... article also describes the growth of eutectic in cast iron in terms of isothermal solidification, directional solidification, and multidirectional solidification. cast iron directional solidification multidirectional solidification nucleation solidification liquid iron-carbon alloys austenite...
Series: ASM Handbook
Volume: 3
Publisher: ASM International
Published: 27 April 2016
DOI: 10.31399/asm.hb.v03.a0006227
EISBN: 978-1-62708-163-4
... illustrates the monotectic solidification for low-dome alloys. The forming mechanism of the banded structure of copper-lead alloy in upward directional solidification is also described. copper-lead system forming monotectic alloys monotectic reaction monotectics solidification Another three...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005214
EISBN: 978-1-62708-187-0
... Abstract This article describes the three solidification mechanisms of peritectic structures, namely, peritectic reaction, peritectic transformation, and direct precipitation. It discusses the theoretical analysis, which shows that the rate of the peritectic transformation is influenced by the...
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
...-ray tomography IN THE PURSUIT for improved insight into the interplay between different transport phenomena that control alloy solidification processes, the inherent difficulties with providing direct observation of the microstructure evolution have been a serious drawback. Typically, experimental...
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
... generated at the interface is dissipated through the solid. Such a temperature field gives rise to directional solidification and results in the columnar zone in a casting. The conditions for the stability of a planar front, discussed in the previous article, “Plane Front Solidification,” by Kurz, show...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005228
EISBN: 978-1-62708-187-0
... equals approximately 9.8 m/s 2 (32 ft/s 2 ), with its direction defining the local vertical. Modification of gravity over practical time scales for the purposes of modifying or controlling solidification was traditionally accomplished only in shot or spray towers, where molten alloys were solidified...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005209
EISBN: 978-1-62708-187-0
...; that is, the temperature must increase from the solid into the melt. Such a situation is typical for directional solidification. Here, the heat flux is unidirectional to produce planar isotherms and interface shapes. For example, in the Bridgman process, a crucible that contains the alloy is moved...
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
... process are now considered as well as how transport phenomena are expressed in the development of microstructure. Fig. 3 Micrographs from directional solidification of a succinonitrile-acetone alloy. Left: initial planar interface with small perturbations; right: developing dendrites, with primary...
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
... as that shown in Fig. 3 ( Ref 4 ). Several aspects of the solidification process are now considered as well as how transport phenomena are expressed in the development of microstructure. Fig. 3 Micrographs from directional solidification of a succinonitrile-acetone alloy. Left: initial planar...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005226
EISBN: 978-1-62708-187-0
... of how microscopic solidification may take place. Because of the limited size of rapidly solidified products, many samples have been prepared only for research to probe the fundamental nature of crystal growth at rapid rates and/or the amorphous state. Other direct uses for the materials are...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003171
EISBN: 978-1-62708-199-3
... tapered wall to promote directional solidification and avoid hot spots. In steel castings, penetration may also occur as a result of formation of iron or manganese oxide on the surface of the molten metal. These oxide phases react with the silica sand to form chemical penetration, which is difficult to...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005227
EISBN: 978-1-62708-187-0
... being pushed ahead of the front. As a dendrite approaches a particle in an undercooled pure melt, it becomes more convex as k p / k l increases. In the directional solidification case of a pure material, the solidification front becomes less convex as k p / k l increases. Solidifying...
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
... coupling of the CA to macroscopic calculation of heat, flow, and mass transfers in castings and applications to realistic casting conditions. microstructure solidification cellular automaton methods macrostructure grain structure castings heat transfers flow transfers mass transfers...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005212
EISBN: 978-1-62708-187-0
... Abstract This article illustrates equilibrium phase diagram for the aluminum-silicon system showing metastable extensions of the liquidus and solidus lines. It describes the classification and microstructure of the aluminum-silicon eutectic. The article presents the theories of solidification...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005211
EISBN: 978-1-62708-187-0
... Abstract This article presents the binary eutectic phase diagram to understand the various structures that evolve in a binary eutectic system during solidification. It describes the various classifications and solidification principles of the eutectic structures. Formation of halos in eutectic...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005423
EISBN: 978-1-62708-196-2
... Abstract A key aspect of solidification process modeling is the treatment of the interface between the solidifying casting and the mold in which it is contained. This article begins with information on casting-mold interface heat-transfer phenomena. It describes practical considerations and...
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
... process. The indirect rapid tooling technologies include 3D Keltool process, hot isostatic pressing, rapid solidification process tooling, precision spray forming, and radially constricted consolidation process. 3D Keltool process direct rapid tooling forging dies hot isostatic pressing indirect...
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 initial research on alloy solidification has been reported ( Ref 3 , 8 , 9 , 10 , 11 ). Fig. 2 Solidification curves (temperature vs. weight fraction solid) for three cases of Al-4.5%Cu alloy: equilibrium (Eq: α → ∞), Gulliver-Scheil (G-S; α → 0), and directional solidification with α...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0009015
EISBN: 978-1-62708-187-0
... avoidance. Establish thermal gradients within the cavity to promote directional solidification and to enhance riser effectiveness. Design riser size and geometry, and locate risers and riser inlets to minimize the ratio of gross weight to net weight. Minimize to the extent possible the vertical...