单晶DD3与细晶GH4169高温合金摩擦焊接界面表征

发布时间：2019-04-19 08:27

【摘要】：采用SEM,TEM及EDS对制造焊接式整体涡轮叶盘所用的单晶DD3与细晶GH4169高温合金摩擦焊接界面进行了研究.结果表明,焊合区存在一条以GH4169合金为主的摩擦变形带,两侧单晶和细晶合金的热力影响区均形成了动态再结晶晶粒;连接界面处于两侧合金的动态再结晶晶粒之间,通过连接界面上的共有晶粒和共有晶界实现了两侧合金的连接;成分过渡主要发生在连接界面处的共有晶粒内和共有晶界处.TEM分析位置的共有晶粒(C2)与相邻GH4169动态再结晶晶粒(C3)具有特殊的取向关系:[1ˉ14]C2∥[1ˉ10]C3和(220)C2∥(220)C3;在摩擦焊热循环及焊后热处理作用下,共有晶粒、两侧动态再结晶晶粒都存在γ'相析出,γ'相呈细小的球形分布,并与γ基体共格,但未发现有γ"相析出.
[Abstract]:The friction welding interface between single crystal DD3 and fine grained GH4169 superalloy was studied by means of SEM,TEM and EDS. The results show that there is a friction deformation zone dominated by GH4169 alloy in the weld zone, and the dynamic recrystallization grain is formed in the thermal influence zone of both sides of single crystal and fine grain alloy. The bonding interface is located between the dynamic recrystallization grains of the two sides of the alloy, and the bonding between the two sides of the alloy is realized by the common grains and the common grain boundaries on the bonding interface. The composition transition occurs mainly in the common grains and at the common grain boundaries at the bonding interface. Tem-based co-grains (C2) have a special orientation relationship with adjacent GH4169 dynamic recrystallization grains (C3): [1 / 14] C2 / [ (1) C _ 3 and (220) C _ 2 / (220) C _ 3; Under the action of friction welding thermal cycle and postweld heat treatment, there are common grains, 纬 'phase is precipitated on both sides of the dynamic recrystallization grain, 纬' phase is fine spherical distribution and is coherent with 纬 matrix, but no 纬 "phase is found.
【作者单位】：西北工业大学现代设计与集成制造技术教育部重点实验室;
【基金】：国家自然科学基金资助项目51175430~~
【分类号】：TG453.9;TG132.3

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