铝含量对Al-Si-Cr合金铸铁组织结构及性能的影响

Effect of Al Content on the Microstructure and Properties of\=AlSiCr Alloy Cast Iron

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。

Abstract The microstructure and properties of AlSiCr alloy cast iron with 8 different compositions (1\^5%8\^88%Al ,1\^5%4\^6%Si,Cr<1\^2% and3\^0%C)were studied.When Al content is below 4 per cent,the M\-3C Carbides decreases with increasing Al Content.When Al content is over 4 per cent,the phase increases with increasing Al content.Besides,An increase in Al content will cause linear increase of increment of the phase lattice constant,so does its microhardness.The phase corresponds to AlFe\-3C\-x,which has the stable component and the microhardness is HV 11801240.The hardness and impact toughness of the cast iron largely determined by the combination of microstructure and properties of phases.