Research on Microstructure and Formation Mechanism of TiC Particles Reinforced Iron Matrix Surface Gradient Composite by In-situ Technology
The in-situ TiC particles reinforced iron matrix surface gradient composite was prepared by casting and heating processing.The microstructure of the composite was researched,and the formation mechanism of the microstructure of the composite was analyzed deeply.The results show that the TiC reinforced surface gradient composite in-situ synthesized is divided into three layers.The largest differences between each layer are the different size and shape of TiC particles.The reaction layer far away from iron matrix is nearly the block titanium carbon.Apparently,the particles don't mainly have diffused.The interface is better between reaction layer and matrix,and no gap.The average size of titanium carbon of combined layer particles is 2～4 μm.Consequently,the different size between the titanium carbon particles in every gradient layers decided that the composite in different layers has different hardness,impact toughness,tenacity intensity,wear resistant,and so on.