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Microporosity

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Published: 01 January 1990
Fig. 15 Improvement of fatigue properties by the elimination of microporosity through HIP processing. Source: Ref 19 More
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Published: 01 December 2004
Fig. 24 Scanning electron micrograph of the interdendritic microporosity associated with solidification defect shown in Figure 2(b) . Note the rounded appearance of the grains that solidified without proper metal feeding. Courtesy of B.R. Powell, General Motors Corporation More
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Published: 01 December 2004
Fig. 2 Steel 2 in Table 1 (grade B3). Microporosity in a 25 mm (1 in.) diam coupon taken from a 500 mm (20 in.) long, 375 mm (15 in.) wide, 100–200 (4–8 in.) thick wedge-block. The coupon was taken from the center of the casting and measured 0.48% porosity. The block average was 0.41 More
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Published: 01 November 2010
Fig. 9 Comparison of predicted and measured microporosity in A356 castings using the model of Zhu et al. Adapted from Ref 29 More
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Published: 01 December 2008
Fig. 9 Influence of microporosity on the impact toughness of 1wt% Cr-0.25wt%. Mo cast steel. Source: Ref 24 More
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003171
EISBN: 978-1-62708-199-3
... Abstract Solidification is a comprehensive process of transformation of the melt of metals and alloys into a solid piece, involving formation of dendrites, segregation which involves change in composition, zone formation in final structure of the casting, and microporosity formation during...
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Published: 01 December 2008
Fig. 2 Typical porosity configurations in aluminum-silicon casting alloys. (a) Shrinkage pore found within a casting. (b) Gas pore in an Al-8% Si alloy. (c) Microporosity (gas plus shrinkage). (d) Microporosity (gas plus shrinkage). Source: Ref 2 More
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Published: 01 November 2010
Fig. 2 Schematic diagram of the various physical processes involved in the formation of microporosity More
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Published: 30 August 2021
Fig. 54 Microstructure at the weld interface showing the presence of a nearly continuous ferrite band in which microporosity was observed. 2% nital etch More
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005520
EISBN: 978-1-62708-197-9
.... The combination of these two driving forces means that porosity, both as macroshrinkage and microporosity, can be found in most castings. The presence of porosity can be highly detrimental to the final mechanical properties of components ranging from continuous casting of steel alloys to aluminum alloy sand...
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Published: 01 December 2008
Fig. 20 In this sand casting, the 3 32 -in. wall froze with microporosity and shrinkage. By increasing the thickness to 5 32 in., defects were eliminated. Aluminum alloy 355 More
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Published: 01 December 2004
Fig. 25 Scanning electron micrograph of hot isostatically pressed Si 3 N 4 (HIPSN) after plasma etching, shown at a magnification sufficient to reveal microporosity. More
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Published: 01 January 2005
Fig. 3 Effects of superimposed pressure on density loss, measured after strip drawing. Increased pressure reduces density loss due to inhibition of nucleation/growth of microporosity. Source: Ref 51 More
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Published: 01 November 2010
Fig. 4 Percentage porosity predictions by Kubo et al. illustrating how the sudden drop in metallostatic pressure when the solid fraction exceeds 0.8 causes the prediction of rapid growth of microporosity in an Al-4.5Cu plate. Adapted from Ref 13 More
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Published: 01 December 2004
Fig. 11 Microstructures of (a) AM60 and (b) AZ91D high-pressure die cast specimens after etching with acetic-glycol. The matrix appears light, with the eutectic phase slightly darker. The large black areas (arrows) are microporosity due to entrapped gas and solidification shrinkage. Courtesy More
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Published: 01 November 2010
Fig. 7 (a) Predicted difference ween gas and local pressure in a steel casting, with the greatest difference indicating the highest chance of microporosity formation. (b) For the same casting, a process map shows how increasing hydrogen or nitrogen content increases the chance of pore More
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Published: 01 December 2008
Fig. 3 ASTM F-75, solution annealed at 1220 °C (2230 °F), electropolished and unetched. Same sample as Fig. 2 , showing carbides nearly completely dissolved. Also shown is distributed microporosity, carbide-free grain boundary, and triple point in the face-centered cubic matrix. Original More
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Published: 01 January 2002
Fig. 2 Additional views of the failed cylinder head shown in Fig. 1 . (a) Fracture surface observed when the crack shown in Fig. 1 was opened. 0.5×. (b) Specimen taken from area adjacent to the vent plug showing microporosity. Etched with 2% nital. 100×. (c) Same as (b), but at a higher More
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Published: 30 August 2021
Fig. 3 Additional views of the failed cylinder head shown in Fig. 2 . (a) Fracture surface observed when the crack shown in Fig. 2 was opened. Original magnification: 0.5×. (b) Specimen taken from area adjacent to the vent plug showing microporosity. Etched with 2% nital. Original More
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Published: 12 September 2022
to the presence of highly interconnected microporosities. Reprinted from Ref 9 with permission from Elsevier More