添加不同矽含量對環保黃銅顯微結構及切削性質的影響

Effects of Adding Various Si Contents on Microstructure and Cutting Ability in Eco Brass

周姵彣(P. W. Chou) ； 廖婉竹(W. J. Liauh) ； 鍾宇翔(Y. S. Jhong) ； 吳威德(W. T. Wu)

《鑄造工程學刊》 40卷3期 (2014/09) Pp. 9-16

摘要

本研究以澆鑄法添加矽於黃銅中，探討不同矽含量（0wt%~1wt%）對黃銅顯微結構與機械性質的影響。結果顯示，隨著矽含量增加，α相區縮小，β相區擴大，達1wt%Si時析出γ相，組織由針狀和島狀轉變為星花狀，流動性增加，結構均勻度上升，晶粒尺寸變大。硬度測試發現，整體硬度上升，歸因於矽固溶於β相產生固溶強化與β相相分率增加所致，最後進行切削測試，隨著矽的添加由長螺旋轉為片狀，而切屑長度縮短及重量減輕，因此其切削性能上升。

關鍵字

矽黃銅 ； 顯微結構 ； 切削 ； 切削性質

並列摘要

This study used addition of Silicon in brass by ingot casting method to investigate the various silicon contents (0wt%~1.0wt%) on microstructure and mechanical properties in brass. The results show that with increasing silicon contents, α-phase region narrowed and β phase region expanded up. When adding to 1.0wt% Si precipitated γ phase. The experimental results show that the structure would change from thin, long needles and islands into stars, when the content of silicon achieves 0.25 wt.%. It means that the fluidity increased, structure became homogenized and grain size got large. According to hardness test can be found that the overall hardness would increase attributed to produce silicon dissolved in the β-phase and β-phase fraction increased. Finally according to cutting test, with the addition of silicon, helical chips changed into elemental chips while chip length is shortened and the weight is lighter so the cutting ability would increase.

並列關鍵字

silicon brass ； microstructure ； cutting ； cutting properties