铝含量对Al-Si-Cr合金铸铁组织结构及性能的影响

• 作 者: 马永庆 张占平 齐育红 于志伟
• 机 构: 大连海事大学
• 出 处: 铸造
• 发表日期: 1999年06期
• 关键词: 合金铸铁 Al-Si-Cr 组织结构 显微硬度 α相 ε相 冲击值 显微组织形貌 点阵常数 片状石墨

研究了８种ＡｌＳｉＣｒ合金铸铁（１５０％～８８８％Ａｌ，１５％～４６％Ｓｉ，Ｃｒ＜１２，３０％Ｃ左右）的组织结构及性能。结果表明，当Ａｌ含量＜４％时，Ｍ３Ｃ碳化物随Ａｌ含量增加而减少；当Ａｌ含量＞４％时，ε相随Ａｌ含量增加而增加。另外，α相点阵常数增量随其中的Ａｌ含量增加呈直线上升，显微硬度也随之升高。ε相成分符合ＡｌＦｅ３Ｃｘ，且有稳定的组成，显微硬度Ｈｖ１１８０～１２４０。该类铸铁的的硬度和冲击值是由显微组织形貌和各相性能综合结果所决定的。

The microstructures of 8 kinds of AlSiCr alloy cast iron (150% ~ 888% Al, 15% ~ 46% Si, Cr≤12,30% C) And performance. The results show that when the content of Al is less than 4%, the carbide content of M3C decreases with the increase of Al content. When the content of Al is more than 4%, the ε content increases with the increase of Al content. In addition, the increment of α phase lattice constant increases linearly with the increase of Al content, and the microhardness increases accordingly. ε phase composition in line with AlFe3Cx, and a stable composition, microhardness Hv1180 ~ 1240. The hardness and impact of cast iron is determined by the combined results of microstructure and phase properties.