含鉬高矽球墨鑄鐵顯微結構與機械性質的研究

The Study on the Microstructures and Mechanical Properties of High Silicon Ductile Irons Alloyed with Molybdenum

張智凱(C. K. Chang) ； 張文雄(W. S. Chang) ； 雷添壽(T. S. Lei)

《鑄造工程學刊》 33卷1期 (2007/03) Pp. 42-50

https://doi.org/10.29809/JTFS.200703.0005

摘要

本研究主要探討數種含Mo高矽球墨鑄鐵的顯微組織與機械性質的特性及其間的關連性。結果顯示：(1)添加Mo，會在晶胞間處偏析出含Mo的共晶碳化物，並在其外圍區域出現顆粒狀析出碳化物，該析出碳化物區域的Mo含量超過2wt%；(2)高溫抗拉強度隨Mo含量而增強，這應與肥粒鐵基底的Mo含量及晶胞間共晶碳化物的增加有關；(3)共晶碳化物隨Mo含量增加而增多，並形成網狀結構，相對上其對室溫機械性質的影響並不若Si含量顯著。

關鍵字

高矽球墨鑄鐵 ； 高溫機械性質 ； 含Mo碳化物

並列摘要

In this research it is aimed to investigate the characteristics of the microstructures and mechanical properties of high silicon ductile irons with alloying molybdenum. The results show that: (1) For high silicon ductile irons with molybdenum alloying, eutectic carbide containing molybdenum existed in the intercellular regions together with fine particles of carbide precipitated along its outer vicinity, those fine particles precipitated areas have a molybdenum concentration over 2.0wt.%; (2) The high temperature tensile strength of high silicon ductile irons increase with the increasing of molybdenum content, that strengthening effect could be attributed to the strengthening in the ferrite matrix from molybdenum and intercellular eutectic carbide; (3) The amount of intercellular eutectic carbide increased with the increasing of molybdenum content, and then tended to form network structure. Relatively, these intercellular eutectic carbides did not have strong effect on the mechanical properties in room temperature when comparing to the influence of silicon.

並列關鍵字

high silicon ductile irons ； high temperature mechanical properties ； molybdenum carbide