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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。
TiC particles reinforced iron-based surface gradient composites were formed by in-situ reaction of casting-heat treatment process. The microstructure of the composites was studied and the formation mechanism of the composites was deeply analyzed. The results show that TiC reinforced surface gradient composites synthesized in-situ are roughly divided into three layers; the biggest difference between each layer is the size and shape of TiC particles generated. The reaction layer far from the substrate side is close to the massive TiC, and obviously the particles are basically not diffused. The bonding interface between the reaction layer and the substrate is good without any gap, and the average size of the TiC particles in the bonding layer is 2~4 μm. Therefore, the size of the TiC particles of each gradient layer determines that the different layers of such composite materials have different hardness, impact properties, tensile strength and wear resistance.