TiAl合金与GH3039高温合金的摩擦焊接

对TiAl合金与GH3039高温合金异种材料进行了摩擦焊接工艺试验. 基于接头的拉伸性能，初步优化了焊接工艺参数. 采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对焊接接头组织、焊合区成分变化及接头连接机理进行了分析. 结果表明，TiAl合金与GH3039高温合金两种异种材料摩擦焊接具有可行性，在摩擦焊接过程中热力耦合的作用下，GH3039侧热力影响区塑性变形较大，TiAl合金侧热力影响区变形较小；TiAl合金与GH3039高温合金摩擦焊接连接界面两侧的合金元素发生了扩散，形成了复杂的层状金属间化合物组织结构；断于TiAl合金母材的焊接接头断口属于典型的脆性断口.

Friction welding of TiAl alloy and superalloy GH3039

Dissimilar material friction welding process between TiAl alloy and GH3039 was studied. Based on the tensile properties of the joint, the welding parameters were optimized preliminarily. The microstructure and mechanism of the welded joint and the composition change of the weld zone were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that the friction welding of dissimilar material between TiAl alloy and GH3039 is feasible, under the action of thermo-mechanical coupling in friction welding process, the plastic deformation of thermo-mechanical affected zone on the side of GH3039 is larger than that of TiAl alloy; The alloy elements on both sides of the friction welding interface between TiAl alloy and GH3039 have diffused, a complex organizational structure of the layered intermetallic compounds has been formed. The fracture of welded joint broken in TiAl alloy base metal belongs to typical brittle fracture.