AC4A 합금의 충격특성 및 피로특성에 미치는 스크랩 함량의 영향

The effects of scrap content on the impact and fatigue properties were investigated in AC4A alloy. The impact absorbed energy of as-cast specimens were 3.61, 3.56, 3.47, and 3.08 Joules, respectively, when scrap contents of the specimens were 0, 20, 35, and 50%. And, the corresponding energy levels...

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Bibliographic Details
Published in한국주조공학회지 (주조) Vol. 36; no. 6; pp. 9 - 16
Main Authors 김헌주, Heon-joo Kim
Format Journal Article
LanguageKorean
Published 한국주조공학회 31.12.2016
Subjects
AC4A alloy
Fatigue property
Impact property
Scrap content
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Summary:The effects of scrap content on the impact and fatigue properties were investigated in AC4A alloy. The impact absorbed energy of as-cast specimens were 3.61, 3.56, 3.47, and 3.08 Joules, respectively, when scrap contents of the specimens were 0, 20, 35, and 50%. And, the corresponding energy levels of the T6 heat-treated condition were 3.66, 3.48, 3.25, and 2.96 Joule. In the same way, the fatigue strength values of the as-cast specimens were 53.2, 52.0, 48.4, and 43.8MPa, respectively, and the corresponding fatigue strengths of the T6 heat-treatment specimens were 85.4, 75.7, 60.6, and 51.2 MPa. Impact absorbed energy and fatigue strength decreased as scrap content of the specimen increased. It is assumed that impact absorbed energy decreased owing to the presence of oxide films, which act as branches of 2nd cracks; fatigue strength also decreased with decreased deflection of the fatigue crack path as the scrap content of the specimens increased.
Bibliography:The Korean Foundrymen`s Society
ISSN:1598-706X