M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: OS2134
会議情報
OS2134 Bi系黄銅におけるき裂発生及び伝播挙動に関する研究
山本 晋也石原 外美嶋川 卓上坂 美治岡田 拓也
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会議録・要旨集 フリー

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Lead is added to traditional free-cutting brass. However, lead is dangerous to the human health and environment. So, Bi brass has been produced as an alternative to the lead brass. In this study, fatigue test was conducted at room temperature using the lead free brass, i.e., Bi brass. The material was clarified to be consist of three phases, a, R and Bi phases. A crack was initiated at Bi phase existing in specimen surface at the early stage of fatigue life. The Bi phase is much softer than the other phases. Prediction of fatigue life was carried out on the basis of crack propagation behavior. The predicted result was in good agreement with the experimental value. It was also clarified that the smaller the size of Bi phase, the longer the fatigue life.
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© 2012 一般社団法人 日本機械学会
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