ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
The mechanical properties of electromagnetically stirred billet of Al alloy duringcontinuous casting such as a tensile, impact, and fatigue property was examined with respect to a sizeand roundness of primary α phase to examine the influence of the globularization and refining ofprimary α phase on the dynamic mechanical property. The billet was continuously cast in a castingspeed of 100 to 600 mm/min during the electromagnetic stirring with a magnetic flux density of 700Gauss and then was heat-treated. All tensile properties were enhanced with decreasing the size ofprimary α crystal and the ultimate tensile strength (UTS), yield strength, and elongation was obtained320MPa, 235MPa, and 17.8%, respectively, at a size of primary α phase of 77 um. The fatigue life atfracture was largely improved by 37% from 1.25×105 to 1.7×105 cycles and the fracture toughnesswas obtained approximately 7.25 joules as a maximum value at a minimum size of primary α phase onthe present experiment condition. Therefore, it indicates that all mechanical properties can beimproved at the higher casting speed owing to the fine microstructure of a primary α phase and alsoeutectic phase due to the higher cooling rate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.340.pdf
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