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Microporosity

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220129
EISBN: 978-1-62708-259-4
..., microporosity, macro- and microsegregation, and hot cracking, as well as the effects of solidification and remelting on castings, ingots, and continuous cast products. It explains how to determine where defects originate in continuous casters and how to control alumina, sulfide, and nitride inclusions...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140165
EISBN: 978-1-62708-264-8
... There is a second type of porosity produced by the solidification process that is called microporosity . This microporosity results because of the geometry of the dendritic solidification front, and the mechanism of formation is a little complicated. Consider dendrites No. 2 and No. 3 in Fig. 15.2 . As shown...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140047
EISBN: 978-1-62708-335-5
...-magnesium alloys, solidification distance loses its importance to a more general tendency for interdendritic shrinkage. These alloys are susceptible to extensive microporosity that results from the higher proportion of feeding that takes place interdendritically. The severity of shrinkage is increased...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 April 2013
DOI: 10.31399/asm.tb.imub.t53720293
EISBN: 978-1-62708-305-8
... that are large enough to see with the unaided eye on radiographic inspection, while microporosity refers to pores that are not visible without magnification. Both macroporosity and microporosity are caused by the combined action of metal shrinkage and gas evolution during solidification. It has been shown...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410215
EISBN: 978-1-62708-280-8
... Air pressure retention Rim section should be leakproof at tire pressure, with limited porosity Corrosion resistance against exposure to salt The face should not have excessive microporosity that might create bubbles in curing after clear coating Minimum weight...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740047
EISBN: 978-1-62708-308-9
..., and water vapor picked up in nonferrous castings, where it causes microporosity. The catalyst used depends on the rate of cure required and the type of metal cast. Shell molding can also be used in place of sand casting when a better surface finish or tighter dimensional control is required. Because...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610585
EISBN: 978-1-62708-303-4
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410021
EISBN: 978-1-62708-280-8
... of distributed microporosity. Fig. 3.4 Photomicrograph of average DAS (SDAS) of (a) 30 μm, solidification time 40 s; and (b) 60 μm, solidification time 360 s. Reprinted with permission from Ref 2 A number of sand castings work successfully in many applications. Millions of cylinder blocks...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240509
EISBN: 978-1-62708-251-8
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... strength and fracture resistance. The reductions can be quite substantial, even when the defects constitute only several volume percent. Shrinkage during solidification can result in microporosity, that is, porosity having diameters on the order of micrometers. In metals, porosity is much more likely...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410151
EISBN: 978-1-62708-280-8
... of the short arm, as shown in Fig. 7.14 . Baring out the coating gives a chilling effect, resulting in less microporosity and improved mechanical properties. 7.3.5 Mold Coating Maps Proper application of mold coatings requires skilled and experienced mold/die conditioners. Consistency depends on good...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420289
EISBN: 978-1-62708-310-2
..., or “critical” alloying elements. Application of alloy phase diagrams in processing includes their use to select proper parameters for working ingots, blooms, and billets, finding causes and cures for microporosity and cracks in castings and welds, controlling solution heat treating to prevent damage caused...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140055
EISBN: 978-1-62708-335-5
... ). The process was developed to significantly improve the mechanical properties and fatigue strength of aluminum alloy sand and permanent mold castings. It has proved capable of substantially eliminating microporosity resulting from the precipitation of hydrogen and the formation of internal shrinkage during...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2000
DOI: 10.31399/asm.tb.ttg2.t61120039
EISBN: 978-1-62708-269-3
... for internal casting quality. Hot isostatically pressed parts also are aesthetically more acceptable. At the same time, use of HIP ensures that subsurface microporosity will be healed and, therefore, will not become exposed on a subsequently machined or polished surface to mar the finish or to act...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310001
EISBN: 978-1-62708-326-3
... discontinuities such as porosity, inclusions, and microcracks, which almost always reduce strength and fracture resistance. The reductions can be quite substantial, even when the defects constitute a relatively minor volume percent. Shrinkage during solidification can result in microporosity, that is, porosity...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630237
EISBN: 978-1-62708-270-9
...-base casting alloy INCO 713. Damage on the trailing edge is secondary, caused when a foreign object was sucked into the engine during service. Fig. 14 (a) Incipient burning on the valve face of an automotive engine exhaust valve caused by microporosity in the hardfacing alloy (~2.5×). (b...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280211
EISBN: 978-1-62708-267-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420363
EISBN: 978-1-62708-310-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2022
DOI: 10.31399/asm.tb.isceg.t59320217
EISBN: 978-1-62708-332-4