【摘要】 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。更多还原

【Abstract】 An iron buckytube composite material was fabricated by direct melting. Rockwell 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 adaptable heat treatment and it is harder than common iron graphite alloy by 5～10HRc 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 an important role in strengthening mechanism.更多还原