【作者】 张修海；

【导师】 苏广才；

【作者基本信息】 广西大学 ， 材料加工工程， 2005， 硕士

【摘要】 原位自生（in situ）颗粒增强金属基复合材料是目前金属基复合材料（MMCs）领域研究的热点内容之一,它是利用热力学平衡的原理在金属基体中直接形成增强颗粒,从而解决了利用外加颗粒增强金属基体时,增强颗粒与金属基体润湿性困难,界面反应严重的问题。为了给传统的钢铁材料增添新的活力,满足现代工业发展的需要,本文根据原位自生法的原理,对TiC_p/Fe复合材料及VC_p/Fe复合材料的制备工艺及其组织性能进行研究。 本文首先从热力学的角度,分析了在铁的金属熔体中合成TiC颗粒和VC颗粒的可行性。然后,研究了保温时间以及合金元素Cu、Ni对TiC_p/Fe复合材料组织性能的影响,结果表明:保温时间越长,生成的TiC颗粒越多;Cu、Ni对复合材料的基体有固溶强化的作用。同时利用正交试验法研究了化学成分对VC_p/Fe复合材料组织性能的影响,结果表明:V和C直接影响VC颗粒的生成,并对VC_p/Fe复合材料的组织性能有重要的影响,根据综合的力学性能指标得到了最优的V、C成分组合为:V%_wt=3.5,C%_wt=1.0;对VC_p/Fe复合材料显微组织的研究发现,VC颗粒与基体的界面结合良好,无明显的界面反应层产生。 本文还研究了TiC_p/Fe复合材料及VC_p/Fe复合材料的铸造性能,结果表明:这两种复合材料的线收缩率都比普通低碳钢小,凝固时倾向于产生集中缩孔,流动性均比灰铸铁差;重熔性好,TiC、VC增强颗粒无明显的衰退现象,有很好的回收利用价值。更多还原

【Abstract】 In situ particulates reinforced metal matrix composites have become one of interesting topics in the field of metal matrix composites（MMCs）. The method of in situ accounting to the principle of thermodynamic equilibrium forms reinforcements in the matrix directly. It successfully resolves the problems that wettability is difficult and interface reaction is bad between reinforcements and matrix if the reinforcements are added to the matrix. In order to provide the traditional iron and steel materials powerful activity and meet the higher requirements presented by modern industry development. The text has studied the fabrication and its properties of TiC_p/Fe composites and VC_p/Fe composites by means of the principle of in situ.At first the analyses of thermodynamics indicates that it is feasible for the combination reaction of TiC_p and VC_p. Then, have studied the temperature retention time and alloying element Cu, Ni for response to influence of the organization and properties of TiC_p/Fe composites. The result shows: The longer temperature retention time is , the more TiC_p produced are. And Cu, Ni can consolidate the matrix of composites. Having also studied chemical composition to the influence of organization and properties of VC_p/Fe composites by means of orthogonal design. The result shows: V and C influence the formation of VC_p directly, and also influence the organization and properties of VC_p/Fe composites. Accounting to the mechanical properties , the best chemical content of V and C is: V%_wt=3.5, C%_wt=1.0, Studying the microstructure of VC_p/Fe composites ,we find that VC_P combines with the matrix very well and there is no obvious interface reaction.The text has concentrated on studying the casting properties of TiC_P/Fe composites and VC_P/Fe composites. The result shows: The line shrinking rate ofthese two kinds of composites is smaller than that of ordinary low carbon steel, incline to produce and concentrate on contracting emptily while solidifying, mobility is worse than that of dust casting iron. Their properties are good when they were smelt again, TiC , VC do not have obvious decline phenomenon, so there is very good recovery value.更多还原