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采用X射线衍射、透射电镜和电子衍射技术对Fe3 Al/Q2 35真空扩散焊界面附近的微观相结构进行了试验研究。试验结果表明 ,当加热温度10 5 0~ 10 80℃ ,保温时间 6 0min ,压力9.8MPa时 ,Fe3 Al金属间化合物与Q2 35钢扩散焊界面附近形成了明显的扩散过渡区 ,该过渡区由Fe3 Al相和α -Fe(Al)固溶体构成 ,显微硬度约为 4 80~5 4 0HM ,不存在含铝较高的高硬度脆性相。有利于提高Fe3 Al/Q2 35扩散过渡区的韧性,提高扩散焊接头的抗裂纹能力。扩散过渡区中的Fe3 Al相与α -Fe(Al)固溶体之间存在着 (11- 0 ) α -Fe(Al) ∥ (0 11) Fe3Al和 [0 0 1]α -Fe(Al) ∥ [10 0 ]Fe3Al的晶体学取向关系。
Phase structure characteristics nearby the interface of Fe 3 Al/Q235 diffusion welding are researched by X ray diffraction (XRD) and transmission electronic microscope (TEM) ,etc. The test results indicated that obviously diffusion transition zone forms nearby the interface of Fe 3 Al/Q235 under the condition of heating temperature 1 050~ 1 080 ℃ ,holding time 60 min and pressure 9.8 MPa,which indicated that the diffusion interface of Fe 3 AVQ235 was combined well. The diffusion transition zone consists...