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Influence of grain ...
Influence of grain refinement on slurry formation and surface segregation in semi-solid Al-7Si-0.3Mg castings
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- Santos, Jorge (author)
- Jönköping University,JTH, Material och tillverkning
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- Kallien, Lothar H. (author)
- Department of Applied Sciences, Aalen University, Aalen, Germany
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- Jarfors, Anders E.W. 1963- (author)
- Jönköping University,JTH, Material och tillverkning
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- Dahle, Arne (author)
- Jönköping University,JTH, Material och tillverkning
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(creator_code:org_t)
- 2018-07-09
- 2018
- English.
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In: Metallurgical and Materials Transactions. A. - : Springer. - 1073-5623 .- 1543-1940. ; 49A:10, s. 4871-4883
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https://doi.org/10.1...
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Abstract
Subject headings
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- This study aims to evaluate the effect of grain refinement on slurry formation and surface segregation in semi-solid castings produced by the Rheometal™ process. The effect of two grain refiners, Al-8B and Al-5Ti-1B, on the slurry α-Al grain size, shape factor and solid fraction was evaluated. The results suggest that the addition of a grain refiner can affect the solid fraction obtained in the RheometalTM process and, consequently, reduce the solute content near the casting surface. Grain refiner addition resulted in a larger fraction of α-Al grains ≤ 60 µm for the refined alloys compared with the unrefined alloy. Additionally, the growth of α-Al slurry globules was greater for the unrefined alloy compared with the refined alloy during solidification in the die-cavity. A more homogeneous and finer microstructure was observed near the surface in the grain-refined castings compared with the unrefined castings. Evidence of significant liquid penetration was identified in some α-Al globules, indicating that disintegration of α-Al globules may occur during the Rheometal™ casting process.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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