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directional solidification

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Published: 01 March 2002
Fig. 5.4 (a) Schematic of typical directional solidification (DS) practice, (b) schematic cutaway showing cooling and metal growth in a columnar grain DS process, and (c) schematic of methods used in single-crystal DS process. (1) Use of helical mold section, (2) use of a right-angle mold More
Image
Published: 01 December 2018
Fig. 4.16 Directional solidification in a gravity permanent mold More
Image
Published: 01 August 2018
Fig. 8.15 Simplified scheme showing directional solidification of an alloy from the mold surface. In the region between x s and x l , temperatures are between T s and T l , and the solid phase fraction varies from 1 to 0. When the temperatures associated with the actual temperature gradient More
Image
Published: 01 March 2012
Fig. 7.7 Microstructure of upward directional solidification of a Cu-37.7Pb alloy in longitudinal section. V = 4.4 μm/s. Source: Ref 7.8 as published in Ref 7.5 More
Image
Published: 01 December 2016
Fig. 1.41 Lamella → rod transition during directional solidification of eutectic. (a) Growth mechanism as affected by cooling rate, criterion-minimum undercooling Δ T . Source: Ref 70 . (b) Eutectic phase morphology as affected by growth rate, criterion-minimum Δ G . Source: Ref 63 More
Image
Published: 01 January 2022
Fig. 12.21 Concept of directional solidification More
Image
Published: 01 June 2008
Fig. 7.19 Directional solidification process for superalloy castings. Source: Ref 10 , 11 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420135
EISBN: 978-1-62708-310-2
... solidification structures. It also discusses the morphology of the microstructure produced during directional solidification and the classification criteria of low- and high-dome alloys. copper-lead alloys monotectic alloy systems phase diagrams solidification structures ANOTHER THREE-PHASE...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280079
EISBN: 978-1-62708-267-9
... patterns, molds, and shells are produced, discusses the practice of directional solidification, and examines an assortment of turbine components cast from nickel- and cobalt-base alloys. The chapter also addresses casting problems such as inclusions, porosity, distortion, core shift, and leaching...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200115
EISBN: 978-1-62708-354-6
... Abstract This chapter explains various aspects of the foundry process that the design engineer should consider when designing steel castings. It discusses special feeding aids, such as tapers, padding, ribs, and chills that may be used by foundry personnel to promote directional solidification...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000025
EISBN: 978-1-62708-313-3
... phase and geometrically and topologically close-packed phases, and describes how superalloy microstructure can be modified via heat treatments and directional solidification. It also discusses the role of carbides, borides, oxides, and nitrides and the detrimental effects of sulfocarbides...
Image
Published: 01 March 2012
Fig. 7.8 Forming mechanism of the banded structure of copper-lead alloy in upward directional solidification. G.D., growth direction. Source: Ref 7.8 as published in Ref 7.5 More
Image
Published: 01 March 2012
) Skewed coupled zone in an irregular eutectic. In both cases, the widening of the coupled zone near the eutectic temperature is observed only in directional solidification (positive thermal gradient). Source: Ref 5.6 More
Image
Published: 01 March 2012
Fig. 7.9 The solid-liquid interface covered with coalesced L 2 phase. Cu-35.4Pb alloy, upward directional solidification, V = 2.2 μm/s. Source: Ref 7.8 as published in Ref 7.5 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140047
EISBN: 978-1-62708-335-5
... stages of interdendritic feeding. Centerline or piping voids result from gross directional effects, when, for example, large fully contained liquid pools are isolated within the casting during solidification. In Al-Si-Cu alloys, rapid cooling leads to the distribution of voids in the grain boundaries...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410029
EISBN: 978-1-62708-280-8
... operator to make process adjustments as needed. 4.6.5 Solidification and Feeding to Prevent Shrink Porosity Chilling and Directional Solidification Both gravity permanent molding and low-pressure permanent molding use steel molds coated with a refractory coating to prevent the aluminum–iron...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410215
EISBN: 978-1-62708-280-8
... need Casting requirements Fatigue life: Radial 1,000,000 cycles B10 (a) min = 800,000 cycles Rotary 100,000 cycles B10 (a ) min = 80,000 cycles A 356 T6 with a minimum of ASTM Level 3 at rib–rim junction Directional solidification through finish stock adjustment and chilling...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220129
EISBN: 978-1-62708-259-4
.... The aspect is typical of a rimmed steel ingot. Bubbles nucleate after the start of solidification and grow in the direction of solidification. No etching. In killed (fully deoxidized) steel there is no gas evolution during solidification. To avoid the presence of internal shrinkage cavities...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410151
EISBN: 978-1-62708-280-8
... plane and part orientation influence numerous aspects of quality, manufacturability, and competitiveness, including: Part soundness in critical areas—freedom from porosity Area for the feeders to feed shrinkage Directional solidification toward the feeder, for suitable thermal gradients...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420087
EISBN: 978-1-62708-310-2
... to make in situ composites. By using a controlled heat flux to achieve slow directional solidification, it is possible to obtain an aligned microstructure throughout the entire casting. When one of the phases is particularly strong, as in the case of TaC fibers in the Ni-TaC eutectic, the mechanical...