pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (22권1호 26-34)
A study on the Microstructural Changes with Modification and Cast-forging in Hypoeutectic Al-Si Alloys
아공정 Al-Si 합금의 개량처리와 주단조에 의한 조직변화에 관한 연구
Ji-Hyun Yoon, Eun-Cheol Seol, Eok-Soo Kim*, Kwang-Hak Lee
University of Ulsan, *Dong-Nam precision Co.
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.
Cast-forging process, Grain refinement treatment, Deformation simulation test, Compressive working