Results 311 to 320 of about 128,560 (335)

Grain Refinement in Undercooled Metals

MRS Proceedings, 1997
ABSTRACTRecently, it was demonstrated that grain refinement in metals can take place through two mechanisms, namely, dynamic nucleation and remelting of initially formed dendrites. In this study, it was found that Ni99.45B0.55 undergoes grain refinement, both by dynamic nucleation or by remelting, depending on the initial bulk undercooling just before ...
H. Yang, H. W. Kui, J. Z. Xiao, J. Z. Xiao   +3 more
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Whole Grains, Refined Grains, and Gluten

2018
What are cereal grains and “pseudograins”? Grains like wheat, corn, oats, and rice are cereal grasses, the fruit or seed of the grass family; many grains are thus referred to as “cereals.” Some plants from the broadleaf family, like amaranth, buckwheat, and quinoa, are...
openaire   +1 more source

Grain Refining of Pure Aluminum

2012
Grain refiners are currently used in casting aluminum alloys to reduce the grain size and to produce equiaxed grains during solidification of the alloys. Using inoculants to refine grains makes alloys castable but produces several disadvantages, including particle agglomerates, local defects, and impurities.
C. Xu, Z. Liu, L. Shao, J. Song, Qingyou Han, L. Han, C. Vian   +6 more
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Refinement and Stability of Grain Structure

Materials Science Forum, 2001
The various methods of producing fine-grained alloys are discussed and it is concluded that thermomechanical processing routes are most suitable for the economic production of the large quantities of material required for structural applications. The limits of grain refinement by conventional discontinuous recrystallization are considered, and the ...
F. John Humphreys, P.S. Bate
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Effect of La on Microstructure and Grain-Refining Performance of Al-Ti-C Grain Refiner

Journal of Rare Earths, 2006
Abstract Al-Ti-C grain refiner was prepared by SHS (self-propagating high-temperature synthesis)-melting technique. The effect of La on the microstructures of grain refiner was studied by OM, TEM, SEM, XRD, and EDS. The experimental results indicate that La can improve the wettability between liquid aluminum and graphite; the addition of La results ...
Wei Liang, Liping Liang, Binfeng Lu, Jinshan Zhang, Chunxiang Xu   +4 more
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Grain refinement of steel castings

JOM, 1967
Titanium inoculation has been shown to be capable of refining the as cast structure of AISI 4335 steel. This refinement consists of changing axed grains and reducing the spacing of the secondary dendrite arms. the structure from columnar to equi-When this steel is heat treated to high strength levels (250,000 psi tensile strength) by conventional ...
Peter F. Wieser, N. Church, John F. Wallace   +2 more
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Grain refinement mechanisms in aluminium and its alloys and the effect of grain refinement on castability

2016
Grain refinement of aluminium has been studied in terms of its mechanism and its effect on the castability of foundry alloys.It is shown that both potent nucleant substrates, of which TiB2 is the most commonly used, and the presence of segregating elements are essential for grain refinement.
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Grain refinement in electrogalvanized coatings

Materials Characterization, 2003
Abstract The effects of grain-refining additives on the morphology and surface roughness of zinc deposits plated at 80 A/dm 2 is presented. Atomic force microscopy (AFM) images show zinc deposits plated without additives are rough and are not of commercial quality.
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Solidification Based Grain Refinement in Steels [PDF]

, 2009
Abstract : The overall research objective of this project is to determine suitable grain refiners for cast steels. Specific objectives are: 1) Identify possible phases to grow delta ferrite and austenite using current nucleation theory, crystallographic data, and thermodynamics.
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Grain Refinement of Aluminum Casting Alloys

International Journal of Metalcasting, 2007
Abstract Grain refinement in aluminum casting alloys tends to reduce the amount of porosity and the size of the pores and to improve mechanical properties, especially fatigue strength. This article provides information on measurement of grain size in alloys and describes the mechanisms of grain refinement in aluminum casting alloys.
Timothy A. Kuhn, Geoffrey K. Sigworth
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