微量铜银合金对球墨铸铁显微组织及机械性质之影响.PDF

微量銅銀合金對球墨鑄鐵顯微組織及機械性質之影響 微量銅銀合金對球墨鑄鐵顯微組織及機械 性質之影響 許正勳•林昱志•葉亞維•劉洪才 大同大學 材料工程學系 Effects of Trace Cu-Ag Alloy on Microstructure and Mechanical Properties of Nodular Graphite Cast Irons By C. H. Hsu, Y. C. Lin, Y. W. Yei, H. T. Liu Department of Materials Engineering, Tatung University 摘 要 球墨鑄鐵可利用各種合金元素的添加來改變機械性質，因此本研究嘗試以濕砂模三明 治澆鑄方式及有/無添加微量銅銀(Cu-Ag)合金來製作兩種球墨鑄鐵，然後探討微量銅銀合 金對球墨鑄鐵顯微組織及機械性質之影響。實驗結果顯示有添加微量0.5wt%Cu+ 0.5wt%Ag 的球墨鑄鐵會促進顯微組織中波來體明顯地增加、球墨數略減及少量縮墨的生成，雖使得 硬度、抗拉強度皆提高，但相對地也會降低延性及衝擊韌性。 關鍵詞：球墨鑄鐵、銅銀合金、顯微組織、機械性質 ABSTRACT The addition of various alloy elements can influence mechanical properties of nodular graphite cast irons. In this study, the two nodular graphite irons with and without adding trace copper and silver alloy were produced by sand casting method, and then the effects of Cu-Ag addition on microstructure and mechanical properties of the irons were explored. The experimental results showed that nodular graphite iron containing 0.5%Cu and 0.5%Ag could promote the formation of a large number of pearlite and a little vermicular graphite, and slightly decrease nodule count. Such a result, both hardness and tensile strength of nodular ductile iron had an increase, but there was a reduction in ductility and impact toughness. Keywords: Nodular graphite cast iron, Cu-Ag alloy, Microstructure, Mechanical property 收稿：106年01月05 日 初審：106年02月15日