微量銅銀合金對球墨鑄鐵顯微組織及機械性質之影響

Effects of Trace Cu-Ag Alloy on Microstructure and Mechanical Properties of Nodular Graphite Cast Irons

許正勳(C. H. Hsu) ； 林昱志(Y. C. Lin) ； 葉亞維(Y. W. Yei) ； 劉洪才(H. T. Liu)

《鑄造工程學刊》 43卷1期 (2017/03) Pp. 21-26

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。

關鍵字

球墨鑄鐵 ； 銅銀合金 ； 顯微組織 ； 機械性質

並列摘要

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.

並列關鍵字

Nodular graphite cast iron ； Cu-Ag alloy ； Microstructure ； Mechanical property