铁-巴基管复合材料的研究

采用直接熔化方法合成铁-巴基管复合材料,研究了复合材料淬火处理后的硬度及显微组织变化。实验结果表明:在适当的淬火工艺下,铁-巴基管复合材料硬度可达HRc65,而且比相同工艺下普通铁碳合金的硬度平均高出5～10HRc.显微组织分析发现淬火马氏体中有规则晶体外形的白亮相存在,波谱分析结果证明它们是贫铁相。差热分析结果表明直到1400℃的高温,巴基管没有相变。高分辨透射电镜观察到复合材料中弥散分布着巴基管,巴基管能在复合材料中稳定存在而起强化作用。

STUDY ON THE IRON BUCKYTUBE COMPOSITE MATERIAL

Aniron-buckytube composite material was fabricated by direct melting. Rock-well hardness and microstructure of the composite material after quenching were investigated. Experimental results show that Rockwell hardness of the iron-buckytube composite material can peak HRc65 after adapt able heat treatment and it is harder than common irongraphite alloy by 5～10 HRc under the same condition. The analysis of microstructure indicates that there exists a kind of carbon-rich white phase that emerged in martensite. Differential thermal analysis(DTA) and high resolution transmission electronic microscope(HRTEM) observation results indicate that the buckytube is stable up to 1400℃, so it can be retained in the composite and it plays animport antrole in strengt hening mechanism.