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dendrite arm spacing

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2012
DOI: 10.31399/asm.tb.pdub.t53420429
EISBN: 978-1-62708-310-2
... dendrite arm spacing, and the factors that contribute to porosity and shrinkage. dendrite metal shrinkage porosity segregation solidification structures ALMOST ALL METALS AND ALLOYS are produced from liquids by solidification. Sometimes, the liquid metal is poured in a mold with a shape...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140039
EISBN: 978-1-62708-335-5
...; dendrite arm spacing; grain size and shape; and eutectic modification and primary phase refinement. This chapter discusses the effects of these microstructural features on properties and methods for controlling them. The chapter concludes with a detailed examination of the refinement of hypereutectic...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240095
EISBN: 978-1-62708-251-8
..., gravity, micro, and inverse. The chapter also provides information on grain refinement and secondary dendrite arm spacing and porosity and shrinkage in castings. It concludes with a brief overview of six of the most important casting processes in industries: sand casting, plaster mold casting, evaporative...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2016
DOI: 10.31399/asm.tb.ascaam.t59190001
EISBN: 978-1-62708-296-9
... parts. It also describes the mechanism behind dendritic grain crystallization and how factors such as surface tension, capillary length, and lattice symmetry affect dendritic arm size and spacing. The section that follows examines the morphology of the silicon crystals that form in aluminum-silicon...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410163
EISBN: 978-1-62708-265-5
... arm spacing , the spacing of dendrite branches normal to the major dendrite axis. Figure 9.17 shows that secondary dendrite arm spacing increases with increasing distance from the chill surface, corresponding to decreasing cooling rates ( Ref 9.50 ), and Fig. 9.18 shows changes in secondary...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220129
EISBN: 978-1-62708-259-4
..., Texas , American Foundry Society , 2001 10. Suzuki A. , Suzuki T. , Nagaoka Y. , and Iwata Y. , On Secondary Dendrite Arm Spacing in Commercial Carbon Steels with Different Carbon Content , J. Japan Inst Metals , Vol 32 ( No. 12 ), 1968 , p 1301 – 5 10.2320...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410021
EISBN: 978-1-62708-280-8
... solidify slowly, resulting in larger secondary dendrite arm spacing (SDAS or DAS) in structure and higher volume of distributed porosity than castings produced in metal molds. Green sand molded castings show slightly larger gas pores due to the hydrogen absorbed from the dissociated moisture in the sand...
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
... that branch from the secondary arms. The spacing of the secondary arms is proportional to the rate at which heat is removed from the casting during solidification. Fig. 6 Growing dendrite tip and dendrite root during columnar growth in a casting. A dendritic form is usually characterized in terms...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1984
DOI: 10.31399/asm.tb.mpp.t67850001
EISBN: 978-1-62708-260-0
... , 1968 , pp. 295 – 304 . 15. Alexander B. H. , and Rhines F. N. : “ Dendritic Crystallization of Alloys, ” Trans. Am. Inst. Min. Metall. Eng. , vol. 188 , 1950 , pp. 1267 – 1273 . 10.1007/BF03399143 16. Dawson J. V. , and Oldfield W. : “ Euctectic Cell Count...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.tb.aacppa.t51140021
EISBN: 978-1-62708-335-5
... property performance that reflects extreme soundness, fine dendrite-arm spacing, and well-refined grain structure. Premium engineered casting objectives require the use of chemical compositions competent to display superior properties. Alloys considered to be premium-strength compositions are listed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060085
EISBN: 978-1-62708-261-7
... grow into rapidly advancing projections, sometimes of complex geometry. Dendrites are small crystalline needles shaped like pine trees ( Fig. 5.6 ), so named after the Greek word dendros for tree. Dendrites have a primary arm with secondary and tertiary arms that branch from it. The spacing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410253
EISBN: 978-1-62708-280-8
... particles and other secondary phases in the matrix. The silicon particles must be rounded, which indicates proper modification and adequate heat treatment. The minimum modification level is 4 on the American Foundry Society (AFS) chart. The grain size must not exceed 600 μm, and secondary dendrite arm...
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
..., and in weld metal, where the small liquid pool allows even faster cooling rates, the spacings can be as small as 100 μm. The diameters of the dendrite main stalks (called primary dendrite arms) are smaller than their spacing, d , by approximately 10 times. The diameter of a human hair is approximately 50 μm...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400049
EISBN: 978-1-62708-258-7
... micrograph, there is a primary dendrite arm (the main stem aligned left-to-right in the micrograph), with a number of secondary arms aligned perpendicular to the primary arm. If the metallographer happened to section the specimen through the secondary arms, the resulting microstructure would reveal...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240063
EISBN: 978-1-62708-251-8
... a homogenization treatment designed to remove the effects of dendritic segregation (coring), the time is proportional to x 2 , where x is approximately the dendritic arm spacing. ...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.lmcs.t66560125
EISBN: 978-1-62708-291-4
...), and an increase in the volume fraction of proeutectoid cementite with further increase in carbon content. The lamellar spacing of the pearlite in all hypoeutectoid steels in this series is much the same, and in all hypereutectoid steels likewise, but the spacing in the latter is much coarser than in the former...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410621
EISBN: 978-1-62708-265-5
... from carefully selected scrap and alloying additions, and for special high-quality grades, previously cast ingots may be subjected to consumable electrode vacuum or electroslag remelting and solidification ( Ref 24.1 – 24.3 , 24.6 ). Ingot size is generally kept small to reduce dendrite arm spacing...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.tb.msisep.t59220583
EISBN: 978-1-62708-259-4
...., Fe 3 C) the alloy has cementite as its single constituent. As discussed in Chapter 8, “Solidification, Segregation, and Nonmetallic Inclusions,” the increase in cooling rate during solidification leads to the decrease of the dendrite arm spacing. Comparison of Fig. 17.12 and 17.15 also clearly...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410029
EISBN: 978-1-62708-280-8
... applications. Recent advances in solidification simulation and flow modeling, coupled with process automation, have positioned the GPM process to meet the most stringent safety quality requirements for critical-safety items such as knuckles, control arms, brake master cylinders, and brake calipers in large...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.mgppis.t60400023
EISBN: 978-1-62708-258-7
...) micro- and macrosegregation of the elements contained in the steel (carbon, manganese, sulfur, phosphorus, etc.). First, we must look at the dendritic structure of steel. A dendrite is shown schematically in Fig. 2.40 . The main “trunk” of the dendrite is called the primary arm, and the other branches...