Freckle criteria for the upward directional solidification of alloys

Autor:	John J. deBarbadillo, Sarwan K. Mannan, Wei Chen, Keh-Minn Chang, Wanhong Yang
Rok vydání:	2001
Předmět:	Convective flow Freckle Materials science Metallurgy Metals and Alloys Thermodynamics Rayleigh number Mechanics Condensed Matter Physics Critical value Mechanics of Materials Metallic materials medicine medicine.symptom Directional solidification
Zdroj:	Metallurgical and Materials Transactions A. 32:397-406
ISSN:	1543-1940 1073-5623
DOI:	10.1007/s11661-001-0271-y
Popis:	Macrosegregation defect freckles result from the convective flow due to a density gradient in the mushy zone. Several freckle criteria were proposed in the literature for the evaluation of the freckle tendency of alloys and processes. These criteria were examined using experimental data of the upward directional solidification of Pb-Sn, Pb-Sb, and Pb-Sn-Sb systems. It is found that the freckle criterion given by Flemings and co-workers gives the best description of the freckle tendency. A Rayleigh number is derived from Flemings’ criterion. The critical value of the Rayleigh number is found to be Ra cr ≈ 1.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1dce161b841e4aa0ea6b572ed326f594 https://doi.org/10.1007/s11661-001-0271-y Zobrazit plný text záznamu Full text from SpringerLink