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http://dx.doi.org/10.7777/jkfs.2022.42.3.153

Effect of Centrifugal Casting Thickness on the Mechanical Properties and the Microstructure of Alloy 625  

Lee, Yu-Jung (Department of Materials Science and Engineering, Changwon National University)
Kim, Byung-Hoon (Department of Materials Science and Engineering, Changwon National University)
Joo, Yun-Kon (Department of Materials Science and Engineering, Changwon National University)
Jo, Chang-Yong (Department of Materials Science and Engineering, Changwon National University)
Lee, Je-Hyun (Department of Materials Science and Engineering, Changwon National University)
Publication Information
Journal of Korea Foundry Society / v.42, no.3, 2022 , pp. 153-160 More about this Journal
Abstract
The effect of thickness on the microstructure and the mechanical properties of centrifugal cast 625 was investigated. Centrifugal cast 625 with various thickness of 10, 17 and 50mm showed partially columnar grained structure 8, 12.3 and 18.5mm respectively from the outer surface. Secondary dendrite arm spacing in the columnar grains slightly increased with increasing casting thickness. Tensile strength of the columnar region was similar regardless of casting thickness. Solidification behavior of the columnar grained region is similar to that of directional solidification, thus solidification rate in the centrifugal cast tube was extrapolated from the secondary dendrite arm spacing data of the directionally solidified material. The equiax grained region formed interior of the thick castings. The tensile strength of the equiaxed region showed the average value of the columnar region which is presumably originated from the grain structure rather than secondary dendrite arm spacing.
Keywords
Alloy 625; Centrifugal cast; Solidification rate; Directional solidification and Secondary dendrite arm spacing;
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