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Effect of stirring on behaviour of double oxide film defects in A356 aluminium melt
Shahid Bahonar Univ, Dept Met & Mat Sci, Kerman, Iran. Shahid Bahonar Univ, Mineral Ind Res Ctr, Kerman, Iran..
Shahid Bahonar Univ, Dept Met & Mat Sci, Kerman, Iran. Shahid Bahonar Univ, Mineral Ind Res Ctr, Kerman, Iran..
2014 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336, Vol. 27, no 4, p. 221-229Article in journal (Refereed) Published
Abstract [en]

The effect of stirring of melt on the behaviour of double oxide film (bifilm) defects in A356 melt was investigated using a reduced pressure test (RPT) technique. The melt was poured from a height into a crucible to introduce bifilms into the melt. The melt was then either remained stagnant or mechanically stirred, and RPT samples were taken from the melt at 8 min intervals. The RPT samples were then characterised by determination of their porosity parameters and examination of the internal surfaces of the pores using a scanning electron microscope. The results showed that stirring of the melt facilitated the diffusion of H in the melt into the atmosphere of the defects and hence accelerated the removal of the defects from the melt by floatation. This effect was attributed to the increase in the stress induced to the defects, which increased the rate of formation of cracks on their layers.

Place, publisher, year, edition, pages
Taylor & Francis, 2014. Vol. 27, no 4, p. 221-229
Keywords [en]
Oxide films, Bifilm, Defect, Aluminium melt, Stirring
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263993DOI: 10.1179/1743133613Y.0000000100ISI: 000346142000006Scopus ID: 2-s2.0-84903162863OAI: oai:DiVA.org:kth-263993DiVA, id: diva2:1371603
Note

QC 20191120

Available from: 2019-11-20 Created: 2019-11-20 Last updated: 2019-11-20Bibliographically approved

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