摘要
采用粉末冶金方法制备高铁基胎体的金刚石工具。通过检测材料的硬度、密度、冲击韧性等性能,考察碳含量对高铁基胎体性能的影响。通过SEM,XRD等测试分析手段研究碳含量对胎体微观结构和相组成的影响。结果表明:胎体密度变化随碳含量的增加而具有波动性,碳含量为0.4%时密度达最大值7.65 g/cm3,碳含量为1%时密度获最小值7.47 g/cm3;未加入碳粉的胎体具有最高的抗冲击韧性值,随加入碳粉量的增加,冲击韧性急剧降低,含碳0.8%的胎体和含碳1%的胎体的冲击韧性值仅为1 J/cm2;加入碳粉的高铁基胎体的抗弯试样为脆性断裂。在碳含量高的情况下,胎体中孔隙多,胎体致密性差。
The high iron-based matrix diamond tools were fabricated by powder metallurgy process.The effects of carbon content on performances of high iron-based matrix were studied by the measurement of hardness,density and impact toughness.The effects of carbon content on microstructure and phase composition were studied by SEM and XRD,respectively.The results show that,the density of iron-based matrix has undulatory property with increasing carbon content,and the highest density of 7.65 g/cm3 and the lowest density of 7.47% are obtained at the carbon content of 0.4% and 1%,respectively.The matrix without carbon addition has the highest impact toughness,and with increasing carbon content,the impact toughness decreases sharply.The impact toughness is only 1 J/cm2 when carbon content is 0.8% and 1%.The rupture of the bend samples with carbon addition is brittle fracture.The matrix has higher porosity and lower densification with the high carbon content.
出处
《粉末冶金材料科学与工程》
EI
2011年第4期625-629,共5页
Materials Science and Engineering of Powder Metallurgy
基金
单位自主基金支撑2011ZL06XCY
关键词
铁基胎体
金刚石工具
碳含量
合金粉
iron-based matrix
diamond tools
carbon content
alloy powder
