【摘要】 以纯Fe3Al粉为主要原料在钢基体表面激光熔覆Fe3Al金属间化合物。利用扫描电镜、能谱仪、X射线衍射等法对熔覆合金层、合金层与钢基体的结合界面等进行了显微组织及相结构的分析。实验结果获得了致密、无肉眼可见气孔、夹杂物,但存在少量裂纹的合金层,合金层与基体间完全冶金结合;熔覆合金层主要由单相Fe3Al构成,覆层组织为粗大等轴状晶团,等轴状晶团由大量极细小的条状Fe3Al晶粒构成,一些相邻的条状晶粒之间具有基本一致的晶体学取向。更多还原

【Abstract】 The coats of Fe₃Al intermetallic compaund were prepared on steel substrate by laser cladding Fe₃Al powders.The microstructure and phase structure of the coat and the boundary between coat and substrate were studied with methods of SEM, EDX and X-ray analysis technique. The compact coats jointed metallurgically with the steel were obtained, with no pore and inclusion in macroscopic except a few cracks. The results show that the microstructure of coat consists of coarse equiaxed grain-groups, which consist of large amount of banding fine Fe₃Al grains, wieh some neighbouring banding grains having the similar orientation.更多还原