pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (39권4호 61-74)
Effect of (Ti-B) and Sr Additives on Impact and Fatigue Properties of Recycled AC4A Aluminum Casting Alloy
재활용 AC4A 알루미늄 합금의 충격 및 피로 특성에 미치는 (Ti-B), Sr 첨가제의 영향
Seung-Hwan Oh and Heon-Joo Kim
*Department of Metallurgical Eng, Pukyong National Graduate School, Busan 48513, Republic of Korea **Department of Metallurgical Eng, Pukyong National Univ., Busan 48513, Republic of Korea
The effects of Sr and (Ti-B) additives on the impact and fatigue properties of recycled (35% scrap content) AC4A aluminum alloy are investigated here. The acicular morphology of the eutectic Si phase of as-cast specimens was converted to the fibrous one with Sr additives. The grain size of the α-solid solution decreased by the addition of (Ti-B) additives. The crack initiation energy (Ei) of the impact absorption energy decreased due to the incorporation of an oxide film and inclusions depending on the scrap used. The modification of the eutectic Si morphology by Sr additives is considered as the main factor of the increase of the average impact absorption energy (Et). The addition of (Ti-B) additives contributed to an increase in the occurrence of crack deflections due to the refining of α-Al grains, resulting in improved fatigue p properties.
α-Al Grain refinement, Eutectic Si modification, Impact property, Fatigue property, Recycled AC4A aluminum alloy
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