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Book Chapter
The Influence and Control of Porosity and Inclusions in Aluminum Castings
Available to PurchaseSeries: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140047
EISBN: 978-1-62708-335-5
... Abstract Porosity in aluminum is caused by the precipitation of hydrogen from liquid solution or by shrinkage during solidification, and more usually by a combination of these effects. Nonmetallic inclusions entrained before solidification influence porosity formation and mechanical properties...
Abstract
Porosity in aluminum is caused by the precipitation of hydrogen from liquid solution or by shrinkage during solidification, and more usually by a combination of these effects. Nonmetallic inclusions entrained before solidification influence porosity formation and mechanical properties. This chapter describes the causes and control of porosity and inclusions in aluminum castings as well as the combined effects of hydrogen, shrinkage, and inclusions on the properties of aluminum alloys. In addition, it discusses the applications of radiography to reveal internal discontinuities in aluminum.
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Porosity in cast eutectoid steel. The shape of porosity in castings is very...
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in Solidification, Segregation, and Nonmetallic Inclusions
> Metallography of Steels: Interpretation of Structure and the Effects of Processing
Published: 01 August 2018
Fig. 8.32 Porosity in cast eutectoid steel. The shape of porosity in castings is very similar to the shape of the interdendritic spaces. Optical micrograph. 2% nital etching (porosity is visible without etching).
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Ultimate tensile strength versus hydrogen porosity for sand-cast bars of th...
Available to PurchasePublished: 01 December 2001
Fig. 15 Ultimate tensile strength versus hydrogen porosity for sand-cast bars of three aluminum alloys
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Effect of hydrogen porosity on the tensile and yield strengths of alloy 356...
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in The Influence and Control of Porosity and Inclusions in Aluminum Castings
> Aluminum Alloy Castings: Properties, Processes, and Applications
Published: 01 December 2004
Fig. 5.8 Effect of hydrogen porosity on the tensile and yield strengths of alloy 356.0-T6 sand castings
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in Accepted Practice for Metallographic Preparation of Thermal Spray Coating Samples
> Thermal Spray Technology: Accepted Practices
Published: 01 June 2022
Figure 17 Effects of smearing on perceived porosity. (a) Smeared thermally sprayed specimen after 9 μm diamond polishing. (b) The same specimen with smearing removed by 10 minutes of 3 μm diamond polishing.
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Types of gas porosity commonly found in weld metal. (a) Uniformly scattered...
Available to PurchasePublished: 01 July 1997
Fig. 1 Types of gas porosity commonly found in weld metal. (a) Uniformly scattered porosity. (b) Cluster porosity. (c) Linear porosity. (d) Elongated porosity
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Coarse grains in HAZ. 65x. (a) Powder metallurgy tungsten; porosity shown a...
Available to PurchasePublished: 01 July 1997
Fig. 4 Coarse grains in HAZ. 65x. (a) Powder metallurgy tungsten; porosity shown along fusion line. (b) CVD tungsten
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Top riser spacing with end zone for no shrink porosity; D R , diameter of t...
Available to PurchasePublished: 01 January 2022
Fig. 12.57 Top riser spacing with end zone for no shrink porosity; D R , diameter of the riser or feeder; EZL, end zone length; LFD, lateral feeding distance; RZL, riser zone length. Source: Ref 27
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Top riser spacing without end zones for no shrink porosity. D R , diameter ...
Available to PurchasePublished: 01 January 2022
Fig. 12.58 Top riser spacing without end zones for no shrink porosity. D R , diameter of the riser or feeder; RZL, riser zone length. Source: Ref 27
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Representative view of the crack propagating from porosity or voids within ...
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in Steel Heat Treatment Failures due to Quenching
> Failure Analysis of Heat Treated Steel Components
Published: 01 September 2008
Fig. 32 Representative view of the crack propagating from porosity or voids within the brazed joint. Unetched. Original magnification: 100×
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Rounded tips of dendritic crystal branches exposed at shrinkage porosity in...
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in Primary Processing Effects on Steel Microstructure and Properties
> Steels: Processing, Structure, and Performance
Published: 01 January 2015
Fig. 9.15 Rounded tips of dendritic crystal branches exposed at shrinkage porosity in the equiaxed solidification zone of an as-cast billet of 4140 steel. SEM micrograph. Courtesy of E.J. Schultz. Source: Ref 9.47
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Another view of dendrite branch tips at shrinkage porosity in equiaxed soli...
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in Primary Processing Effects on Steel Microstructure and Properties
> Steels: Processing, Structure, and Performance
Published: 01 January 2015
Fig. 9.16 Another view of dendrite branch tips at shrinkage porosity in equiaxed solidification zone of an as-cast 4140 steel billet. SEM micrograph. Source: Ref 9.47
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(a) Optical micrographs depicting variation in porosity with processing par...
Available to PurchasePublished: 01 June 2016
Fig. 5.2 (a) Optical micrographs depicting variation in porosity with processing parameters for a Ti-64 coating on a SS304 substrate. (b, c) Variation of porosity with thickness and gas pressure as measured from the optical micrograph. Source: Ref 5.10
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Interdendritic porosity (microporosity) in a steel casting containing 0.28%...
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in Solidification, Segregation, and Nonmetallic Inclusions
> Metallography of Steels: Interpretation of Structure and the Effects of Processing
Published: 01 August 2018
Fig. 8.30 Interdendritic porosity (microporosity) in a steel casting containing 0.28% C, quenched and tempered. The shape of porosity in castings is very similar to the shape of the interdendritic spaces. Optical micrograph. 2% nital etching (porosity is visible without etching).
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in Solidification, Segregation, and Nonmetallic Inclusions
> Metallography of Steels: Interpretation of Structure and the Effects of Processing
Published: 01 August 2018
Fig. 8.31 Severe porosity in a steel casting. Optical micrograph. No etching.
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Data for the sintered porosity and delta ferrite content in heat treated 17...
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in Case Studies of Powder-Binder Processing Practices
> Binder and Polymer Assisted Powder Processing
Published: 30 April 2020
Fig. 10.14 Data for the sintered porosity and delta ferrite content in heat treated 17-4 PH after sintering for 60 min at various hold temperatures in hydrogen. The results include gas- and water-atomized powders. Source: Blaine et al. ( Ref 8 , 9 , 10 )
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