Principles of Microstructural Formation in Semi-Solid Metal Processing

Abstract:

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The essential first step in semi-solid forming is to obtain a high grain density during the initial stages of solidification of an alloy melt. This is usually done by a combination of cooling and convection. If the grain density is too low, the resulting structure is one of conventional coarse dendrites, unsuitable for semi-solid forming. At higher grain densities, fine dendrites grow that can be coarsened to a spheroidal structure in a short enough time to be of practical interest for semi-solid forming. If the initial grain density is still higher, the grains grow in a fully spheroidal manner. Thus there are two distinctly different paths to formation of the desired structure: 1) coarsening of fine dendrites, and 2) direct spheroidal growth. We are beginning to understand quantitatively the conditions necessary to form spheroids in these two different ways.

Info:

Periodical:

Solid State Phenomena (Volumes 116-117)

Edited by:

C.G. Kang, S.K. Kim and S.Y. Lee

Pages:

1-8

DOI:

10.4028/www.scientific.net/SSP.116-117.1

Citation:

M.C. Flemings and R. A. Martinez, "Principles of Microstructural Formation in Semi-Solid Metal Processing", Solid State Phenomena, Vols. 116-117, pp. 1-8, 2006

Online since:

October 2006

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$35.00

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