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A study on the Microstructural Changes with Modification and Cast-forging in Hypoeutectic Al-Si Alloys  

Yoon, Ji-Hyun (The School of Materials Science and Engineering, University of Ulsan)
Seol, Eun-Cheol (The School of Materials Science and Engineering, University of Ulsan)
Kim, Eok-Soo (Dong-Nam precision Co., Ltd.)
Lee, Kwang-Hak (The School of Materials Science and Engineering, University of Ulsan)
Publication Information
Journal of Korea Foundry Society / v.22, no.1, 2002 , pp. 26-34 More about this Journal
Abstract
For application of cast-forging process with Al-Si alloys, casting experiments are carried out by adding Sr and TiB to Al-Si alloys for grain refinement treatment. We experimented on the mechanical properties according to microstructural changes, forging ability test and also investigated the mechanical properties after forging. The finest microstructure could be observed respectively when 0.05 wt.%Sr and 0.1 wt.%TiB were added. In this case, tensile strength and elongation increased much more than as casting. After high temperature deformation simulation test with grain refinement specimens was carried out, about 60N per unit $area(mm^2)$ of specimen was confirmed. After hot forging, tensile strength and elongation were increased. It was considered that casting defect was removed by compressive working.
Keywords
Cast-forging process; Grain refinement treatment; Deformation simulation test; Compressive working;
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