Strengthening of HT250 by modified ultra-fine ceramic powders

作     者：Bo Yuan Mei-ling Chen Jun Yang Gui-lin Liu Zhi-ming Yan 

作者机构：Collage of Materials Science and Engineering Dalian Jiaotong University 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2015年第12卷第6期

页      面：418-424页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(grant no.51204028) 

主　　题：modified ultra-fine ceramic powders HT250 microstructure mechanical properties wear resistance 

摘      要：In this study, three kinds of modified ultra-fine ceramic powders marked A, B and C, which were prepared by each of three different modifiers mixing with a commercial SiC, were added to HT250 cast iron, respectively, and the effects of the modified ultra-fine ceramic powders on microstructure, mechanical properties and wear resistance were studied. Metallographic examination, tensile test, scanning electron microscopy, and three-dimensional surface topography were applied to analyze and compare the samples containing modified powder with the original samples. The results showed that the most obvious modification effect among the powders was seen in the sample containing powder A, with the graphite and eutectic cells being refined, the tensile strength being increased by 36.9%, and the wear resistance being improved by 45.5% and 47.2% under loads of 150 N and 300 N, respectively. The improvements of mechanical properties and wear resistance in the HT250 cast iron with the modified ultra-fine ceramic powders were attributed to the synergistic effect of the grain refinement with the powder acting as a hard particle phase and the lubrication by the graphite.