摘要
利用铸造-热处理工艺原位反应生成了TiC颗粒增强铁基表面梯度复合材料,对该复合材料的组织进行了研究,并深刻剖析了该复合材料组织的形成机理。结果表明:原位合成的TiC增强表面梯度复合材料大致分为三层;每层之间最大的区别是生成的TiC颗粒的大小及形状不同。远离基体侧的反应层接近于大块状的TiC,显然是颗粒基本上没有扩散;反应层与基体结合界面良好、无间隙,结合层TiC颗粒平均大小为2～4μm。因此,各梯度层TiC颗粒的大小决定了此种复合材料的不同层具有不同的硬度、冲击性能、抗拉强度和耐磨性等。
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.
出处
《热加工工艺》
CSCD
北大核心
2012年第4期99-102,共4页
Hot Working Technology
基金
国家自然科学基金面上项目(50974101)
