Effect of Cr and Ni on diffusion bonding of Fe3Al with steel

[摘要] Microstructure at the diffusion bonding interface between Fe₃Al and steel including Q235 low carbon steel and Cr18â€�?�Ni8 stainless steel was analysed and compared by means of scanning electron microscopy and transmission electron microscopy. The effect of Cr and Ni on microstructure at the Fe₃Al/steel diffusion bonding interface was discussed. The experimental results indicate that it is favourable for the diffusion of Cr and Ni at the interface to accelerate combination of Fe₃Al and steel during bonding. Therefore, the width of Fe₃Al/Cr18â€�?�Ni8 interface transition zone is more than that of Fe₃Al/Q235. And Fe3Al dislocation couples with different distances, even dislocation net occurs at the Fe₃Al/Cr18â€�?�Ni8 interface because of the dispersive distribution of Cr and Ni in Fe₃Al phase.

[学科分类] 材料工程

[关键词] Cr;Ni;Fe3Al/steel interface;diffusion bonding.