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研究了AlCTi、FeCTi、FeAlCTi体系热爆反应形成的组织和结构,并结合传统的铸造工艺在铸造模具钢表面形成颗粒增强复合层。研究结果表明:20%Fe10%AlCTi是较理想的复合体系,其热爆温度低于30%FeCTi体系,在1200℃热爆反应可充分进行,获得颗粒尺寸为1～2μm的TiC和少量FeAl。铸造过程中热爆形成的表层增强颗粒与钢发生相互扩散,实现了较好的融合,复合层的厚度达4mm,硬度得到提高,并呈梯度分布。
The microstructure and structure of the AlCTi, FeCTi and FeAlCTi systems were investigated. The microstructure and structure of the castings were simulated by the traditional casting process. The results show that 20% Fe10% AlCTi is an ideal composite system, and its thermal explosion temperature is lower than 30% FeCTi. The thermal explosion reaction at 1200 ℃ can be fully carried out. TiC with a particle size of 1 ~ 2μm and a small amount of FeAl are obtained. During the casting process, the superficial particles formed by the thermal explosion and the steel interdiffuse with each other to achieve better fusion. The thickness of the composite layer reaches 4mm, and the hardness increases with a gradient distribution.