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| Properties of the Joints Bonded by Transformation/Diffusion Brazing (T/DB) and Diffusion Behaviours of the Major Elements |
| ZHANG Guifeng; ZHANG Jianxun; PEI Yi; NIU Jing |
| State Key Laboratory for Mechanical Behavior of Materials; Xi' an Jiaotong University; Xi' an 710049 |
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Cite this article:
ZHANG Guifeng; ZHANG Jianxun; PEI Yi; NIU Jing. Properties of the Joints Bonded by Transformation/Diffusion Brazing (T/DB) and Diffusion Behaviours of the Major Elements. Acta Metall Sin, 2004, 40(6): 653-.
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Abstract A new bonding method combining transformation superplastic diffusion bonding with diffusion brazing (T/DB) is proposed. A welding experiment was performed using a low carbon steel as base metal and BNi2 amorphous foil as interlayer at 1200℃. The results are as following: Although the time at elevated temperature is shortened and the number of temperature cycles is reduced to 3, a mechanically sound joint can be obtained easily. The content of Fe at the center of residual interlayer is increased to about 60%--70%, and in the region of base metal adjacent to welded interface, the Ni atoms diffused into the base metal almost mainly exist in the lamellar pearlite of base metal from the EDXS point analysis, which shows the significant selectivity for Ni atoms diffusion path. Furthermore, the phase boundary diffusions are classified as steady phase boundary diffusion and dynamic phase boundary diffusion, and the higher diffusion rate in the T/DB process is attributed to fully utilize phase boundary diffusions and to suitably utilize bulk
diffusion.
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Received: 17 July 2003
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