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Phase structure characteristics near the interface of Fe3Al/Q235 diffusion bonding are investigated by means of X raydiffraction (XRD), transmission electronic microscope (TEM) and electron diffraction, etc. The test results indicatedthat obviously a diffusion transition zone forms near the interface of Fe3Al/Q235 under the condition of heatingtemperature 1050~1100℃, holding time 60 min and pressure 9.8 MPa, which indicated that the diffusion interfaceof Fe3Al/Q235 was combined well. The diffusion transition zone consisted of Fe3Al and a-Fe(Al) solid solution.Microhardness near the diffusion transition zone was HM 480~540. There was not brittle phase of high hardness inthe interface transition zone. This is favorable to enhance toughness of Fe3Al/Q235 diffusion joint.
Phase structure characteristics near the interface of Fe3Al / Q235 diffusion bonding are investigated by means of X raydiffraction (XRD), transmission electronic microscope (TEM) and electron diffraction, etc. The test results show that obviously a diffusion transition zone forms near the interface of Fe3Al / Q235 under the condition of heatingtemperature 1050 ~ 1100 ℃, holding time 60 min and pressure 9.8 MPa, which indicated that the diffusion interfaceof Fe3Al / Q235 was combined well. The diffusion transition zone consisted of Fe3Al and a-Fe (Al) solid solution . Microhardness near the diffusion transition zone was HM 480-540. There was not brittle phase of high hardness inthe interface transition zone. This is particularly to enhance toughness of Fe3Al / Q235 diffusion joint.