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Fe3Al and Cr18-Ni8 steel were bonded in vacuum and an interface was formed between Fe3Al and Cr18-Ni8 steel. Stress distribution at the diffusion-bonded interface was researched by numerical simulation and finite element method (FEM). The results indicated that the peak stress appeared at the interface near Cr18-Ni8 steel side. This is the key factor to induce crack at this position. With the enhancement of heating temperature,the peak stress at the bonded interface increases. When the temperature is 1100℃,the peak stress is up to 65.9MPa,which is bigger than that at 1000℃ by 9.4%. In addition,the peak stress becomes bigger with the increase of the thickness of base metal from 1mm to 8mm. While the thickness is more than 8mm,the peak stress varies slightly with the change of the thickness.
Stress distribution at the diffusion-bonded interface was researched by numerical simulation and finite element method (FEM). The results indicated that the peak stress is at the interface near Cr18-Ni8 steel side. This is the key factor to induce crack at this position. With the enhancement of heating temperature, the peak stress at the bonded interface increases. is up to 65.9 MPa, which is bigger than that at 1000 ° C by 9.4%. In addition, the peak stress becomes bigger with the increase of the thickness of base metal from 1 mm to 8 mm. While the thickness is more than 8 mm, the peak stress varies slightly with the change of the thickness.