The effects of the reactive temperature, time and the cooling rate of an Fe Ti C alloy melt on the microstructures and mechanical properties of in situ TiC p/Fe composites were investigated. The results show that the ...The effects of the reactive temperature, time and the cooling rate of an Fe Ti C alloy melt on the microstructures and mechanical properties of in situ TiC p/Fe composites were investigated. The results show that the hardness and impact toughness of the prepared composites increase with increasing the reactive temperature, because more and finer TiC particles are formed in the higher temperature melt. However, after the TiC synthesis reaction in the melt completed, the impact toughness of the composites will decrease if the melt reactive time is further prolonged, owing to the coarsening of the formed TiC particles. Under the present experimental condition, the cooling rate of the melt containing dispersions has little influence on the number, size and distribution of the particles in the composites.展开更多
TiC_p/ZA-12 composites were fabricated by exothermic disposition method process and stirring-casting techniques. The microstructure and wear-resistant properties were investigated . The results show that TiC particles...TiC_p/ZA-12 composites were fabricated by exothermic disposition method process and stirring-casting techniques. The microstructure and wear-resistant properties were investigated . The results show that TiC particles are formed in-situ and distributed uniformly in matrix. No particles aggregation and macro or micro precipitation are observed. The wear-resistant properties of composites increase with the increase of TiC_p content, but will not increase when the TiC_p content reaches constant value. Finally, the friction and wear mechanism were also discussed.展开更多
文摘The effects of the reactive temperature, time and the cooling rate of an Fe Ti C alloy melt on the microstructures and mechanical properties of in situ TiC p/Fe composites were investigated. The results show that the hardness and impact toughness of the prepared composites increase with increasing the reactive temperature, because more and finer TiC particles are formed in the higher temperature melt. However, after the TiC synthesis reaction in the melt completed, the impact toughness of the composites will decrease if the melt reactive time is further prolonged, owing to the coarsening of the formed TiC particles. Under the present experimental condition, the cooling rate of the melt containing dispersions has little influence on the number, size and distribution of the particles in the composites.
文摘TiC_p/ZA-12 composites were fabricated by exothermic disposition method process and stirring-casting techniques. The microstructure and wear-resistant properties were investigated . The results show that TiC particles are formed in-situ and distributed uniformly in matrix. No particles aggregation and macro or micro precipitation are observed. The wear-resistant properties of composites increase with the increase of TiC_p content, but will not increase when the TiC_p content reaches constant value. Finally, the friction and wear mechanism were also discussed.
