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将不同质量配比的Ti粉和C粉等经球磨并压制成预制块,黏接到EPS泡沫模型的表面上,采用真空消失模铸造法浇注高温钢液引发自蔓延高温合成(SHS)反应,制备原位合成Ti C颗粒增强钢基表面复合材料。通过X-ray、OM、SEM、EDS及硬度测试等方法,研究复合材料的显微组织和力学性能。结果表明:当钛碳质量比为3.5时,制得的复合材料合金层表面质量良好,组织致密;复合材料由复合层、过渡层和基体3部分组成,复合层组织由Ti C、(Fe,Ti)C颗粒和α-Fe基体相构成,Ti C颗粒呈圆球或近圆球形状,分布均匀;表面复合材料硬度由表及里呈下降趋势,最高硬度值,为70HRC。
Ti powders and C powders with different mass ratios were ball milled and pressed into pre-formed blocks, adhered to the surface of the EPS foam model, and self-propagating high-temperature synthesis (SHS) reaction was initiated by casting high-temperature molten steel with vacuum- Preparation of in situ synthesized TiC particles reinforced steel matrix surface composites. The microstructure and mechanical properties of the composites were investigated by X-ray, OM, SEM, EDS and hardness testing. The results show that when the mass ratio of titanium to carbon is 3.5, the surface quality of the prepared composite alloy layer is good and the microstructure is compact. The composite material consists of three layers of composite layer, transition layer and matrix. The composite layer consists of TiC, (Fe, Ti) C particles and α-Fe matrix phase. The TiC particles are spherical or nearly spherical with uniform distribution. The hardness of the surface composites shows a downward trend from the top to the bottom. The highest hardness is 70HRC.