摘要
采用粉末冶金与原位合成相结合的方法制备了(Ti,V)C/Fe基复合材料,用X射线衍射、扫描电镜研究了该复合材料的物相结构和显微组织。结合热分析和高温X射线衍射,对Fe-Ti-V-C体系的反应机理进行研究。结果表明:反应合成的复合材料的相组成为(Ti,V)C和α-Fe,细小的球状(Ti,V)C颗粒均匀分布在珠光体基体上。Fe-Ti-V-C体系的反应机理为,首先在765.7℃发生Fe的同素异构转变,即α-Fe→γ-Fe,以及钒的碳化反应FeV+C=VC+Fe;其次在1058.5℃,Ti与Fe共熔而形成低共熔体Ti2Fe;在1140.4℃,C与Ti2Fe反应生成TiC;最后,随着温度的继续升高,TiC和VC形成了(Ti,V)C固溶体。
（Ti,V）C/Fe composite was produced by a novel process which combined in situ synthesis with powder metallurgy technique. The microstructure of the （Ti,V）C/Fe composite was studied by SEM and XRD; with the help of DTA and high-temperature X-ray diffraction, the reaction mechanism of the Fe-Ti-V-C system was discussed. The results show that the synthesized composite consists of （Ti,V）C particles and α-Fe used as the binder phase; fine spherical （Ti,V）C particles exhibit homogeneous distribution in the pearlite matrix. The reaction mechanism is as follow： allotropic change of α-Feα→γ-Fe and the reaction FeV＋C→Fe＋VC at 765.7℃; the compound Ti2Fe was formated at 1058.5℃ because of the eutectic reaction between Ti and Fe; reaction between carbon and melted Ti2Fe causes formation of TiC at 1140.4℃; （Ti,V）C was formated due to the rise in temperature.
出处
《热加工工艺》
CSCD
北大核心
2009年第14期85-88,共4页
Hot Working Technology
