Abstract
Diffusion bonding of Fe-28Al alloy with Cr18–Ni8 austenitic stainless steel was carried out in vacuum of 10 −4 Pa and a diffusion-bonded Fe-28Al/Cr18–Ni8 joint with diffusion reaction layer was formed. Microstructure and reacted phases in the joint were investigated by means of scanning electron microscope (SEM) and X-ray diffractometry (XRD). The reacted phases in the diffusion reaction layer are FeAl, Fe 3Al, Ni 3Al and α–Fe (Al) solid solution and they may decrease diffusion activation energy of Al, Fe, Cr and Ni to promote element diffusion and even to accelerate the formation of a diffusion reaction layer. The growth of diffusion reaction layer obeys parabolic law and its thickness ( y) is expressed to be y 2=7.5×10 −4 exp(−83600/ RT)( t– t 0) (mm 2). This is favorable to guide the choice of bonding parameters for Fe-28Al alloy with austenitic stainless steel.
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