The columnar to equiaxed transition in horizontal directchill cast magnesium alloy AZ91

Grandfield, John F., Davidson, Cameron J. and Taylor, John A. (2000). The columnar to equiaxed transition in horizontal directchill cast magnesium alloy AZ91. In: K. Ehrke and W. Schneider, Continuous Casting. Continuous Casting 2000 symposium, Frankfurt, Germany, (245-250). 13-15 November, 2000. doi:10.1002/3527607331.ch36


Author Grandfield, John F.
Davidson, Cameron J.
Taylor, John A.
Title of paper The columnar to equiaxed transition in horizontal directchill cast magnesium alloy AZ91
Conference name Continuous Casting 2000 symposium
Conference location Frankfurt, Germany
Conference dates 13-15 November, 2000
Proceedings title Continuous Casting
Place of Publication Weinheim, Germany
Publisher Wiley-VCH
Publication Year 2000
Sub-type Fully published paper
DOI 10.1002/3527607331.ch36
ISBN 3527302832
9783527302833
9783527607334
Editor K. Ehrke
W. Schneider
Start page 245
End page 250
Total pages 6
Collection year 2000
Language eng
Abstract/Summary The horizontal direct chill (HDC) casting process has been investigated as a production route for magnesium remelt ingot. During this development program, HDC ingots of AZ91 were cast at two pilot plants. Ingots cast at one site exhibited columnar microstructures and were prone to formation of centreline cracks, whereas ingots cast at the other site had equiaxed microstructures and did not crack. In order to determine whether differences in the casting conditions or the melt preparation practices at the two sites were responsible for the change in the microstructure, available models of the columnar to equiaxed transition (CET) were applied. Ingot microstructures were examined and thermal data were obtained. CAFE (cellular automata finite element) modelling using the CalcoMOSTM program was also used to predict grain structures. Results showed that while increased casting temperatures can contribute to a slightly increased tendency toward formation of columnar grain structures, a change in the concentration of nuclei is a more likely cause.
Subjects E2
291302 Physical Metallurgy
671004 Castings
Keyword continuous casting
horizontal direct chill cast magnesium alloy AZ91
columnar
Q-Index Code E2

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Fri, 06 Jun 2008, 14:35:29 EST