添加高速钢粉对烧结钢组织与性能的影响

研究了添加高速钢粉对烧结钢组织与性能的影响。实验结果表明，含２０％高速钢的烧结钢综合力学性能最好；添加高速钢粉能导致烧结钢密度减小的冲击韧性降低，当高速钢含量增中时，硬度随之增加，烧结钢中残余奥氏体和马氏体的含量与高速钢的含量呈线性关系。烧结钢中的马氏体显微硬度很高，它主要原高速钢粒子和原铁粒子的连接区域形成。

THE INFLUENCE OF ADDITION OF HIGH SPEED STEEL POWDER ON THE PROPERTIES AND MICROSTRUCTURE OF THE SINTERED STEELS

The influence of addition of high speed steel powder on the properties and microstructure ofsintered steels has been studied. The aim of this research is to find out proper content of high speed steelpowdes which will lead to an achievement of the optimum mechanical properties of the sintered samples. The results show that the optimum mechanical properties have been obtained with about 20%high speed steel powder addition. The addition of high speed steel powder will result in a decrease inboth density and impact energy of the sintered steels. The hardness of the sintered steel increasses ascontent of high speed steel increases. The amount of retained austenit and the amount of martensitehave a linear relationship with the content of high speed steel in the sintered steels. The martensitewhich is high in microhardness is mainly formed in the interconected areas between original high speedsteel P8rticles and original iron particles in the sintered steels.