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Porosity
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Series: 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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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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Published: 01 December 2001
Fig. 15 Ultimate tensile strength versus hydrogen porosity for sand-cast bars of three aluminum alloys
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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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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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Published: 01 August 2013
Fig. 8.1 Decrease of fracture strength with porosity. From data concerning stainless steel, iron, and plaster of paris. Source: Adapted from Ref 8.1
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Published: 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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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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Published: 01 September 2008
Fig. 2 Wormhole or piping porosity in weld metal deposited by submerged arc welding. Plate is 19 mm thick.
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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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Published: 01 April 2013
Fig. 8 Digital radiography image of a die cast aluminum carburetor. Porosity appears as dark spots in the area of the center bore, through the vertical center of the image. Courtesy of B.G. Isaacson, Bio-Imaging Research, Inc.
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Published: 01 April 2013
Fig. 1 Type of gas porosity commonly found in weld metal. (a) Uniformly scattered porosity. (b) Cluster porosity. (c) Linear porosity. (d) Elongated porosity. Source: Ref 1
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Published: 01 April 2013
Fig. 2 Wormhole porosity in a weld bead. Longitudinal cut. 20×. Source: Ref 1
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in Fatigue and Fracture of Continuous-Fiber Polymer-Matrix Composites
> Fatigue and Fracture: Understanding the Basics
Published: 01 November 2012
Fig. 33 Various forms of voids and porosity. Source: Ref 7
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in Fatigue and Fracture of Continuous-Fiber Polymer-Matrix Composites
> Fatigue and Fracture: Understanding the Basics
Published: 01 November 2012
Fig. 34 Effect of porosity on interlaminar shear strength of carbon/epoxy. Source: Ref 18
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in Fatigue and Fracture of Continuous-Fiber Polymer-Matrix Composites
> Fatigue and Fracture: Understanding the Basics
Published: 01 November 2012
Fig. 35 Strength loss due to porosity. RT, room temperature. Source: Ref 7
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