原位Fe-TiC表面复合材料的组织与耐磨性能研究

Study on Microstructure and Wear-Resistance of in Situ Synthesized Fe-TiC Surface Composites

利用液态表面反应技术,在铸钢件上原位生成Fe-TiC表面复合材料。探讨了表面复合材料中TiC颗粒的形成及特征。用SEM、电子探针能谱、XRD研究了该表面复合材料的显微组织和成分分布。结果表明:在表面复合材料的基体中生成了大量的TiC和(Fe,Cr)_7C_3碳化物。表面复合材料中的合金元素、TiC颗粒、(Fe,Cr)_7C_3由表及里,呈明显逐渐降低的梯度分布。表面复合材料层与母体铸钢之间有良好的冶金结合界面。在重载干摩擦磨损条件下,Fe-TiC表面复合材料表现出优异的耐磨性能。

Fe-TiC surface composites were prepared by a novel liquid reaction casting technique involving in situ synthesis reaction. The formation and characteristics of TiC particles were discussed. The microstructure and phase of the surface composite were investigated using SEM, an electron probe and XRD. Results show that fine TiC particles and （Fe, Cr）7C3 colonies in an iron matrix were achieved on the surface of cast steel during casting. TiC particles and alloy elements took on a gradient distribution and decreased gradually with the distance from the outside increasing. An excellent metallurgy-bond was observed between the surface composite layer and the master-steel Under dry slipping tests with heavy loads, Fe-TiC surface composites offer excellent wear-resistance.