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Study on fabrication and microstructure of in-situ TiC/Fe composites

Jin Yunxue1,Guo Yuhang1,Li Jungang2(1.School of Material Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)(2.School of Material Science and Engineering,Jiamusi University,Jiamusi Heilongjiang 154007,China)  
During melting process of the No.45 plain carbon steels,In-situ TiC particle-reinforced ferrous matrix composites with different contents were fabricated by adding Ti metal.The microstructure of composites was analyzed,and its performance was measured.The results show that different volume fraction of TiC particle-reinforced ferrous matrix composites can be fabricated by using simple melting-casting method.The shape of the most TiC in composites is fine,regular triangular or quadrilateral.The TiC quantity increases with the Ti.Facet dendrite TiC forms when the content of TiC approaches to a certain amount.The hardness of composite increases with the TiC.The formation of TiC reduces carbon content in matrix when Ti is only added during material fabrication.It leads to Fe3C in the matrix decreasing or disappearing.The macro hardness shows pre-increasing and then post-decreasing with the increasing of Ti content.Simultaneously,the excessive titanium forms non-stoichiometric TiCx with carbon lack and the strip Fe2Ti intermetallic compounds.
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