采用梯度结构进行石墨/金属熔覆连接  

Realization of Cladding Join of Metal and Graphite by Constructing a Rectangular Wave Interface

作　　者：马哲[1] 李京龙[1] 熊江涛[1] 张赋升[1] 

机构地区：[1]西北工业大学摩擦焊接陕西省重点实验室,陕西西安710072

出　　处：《热加工工艺》2009年第5期109-112,共4页Hot Working Technology

摘　　要：通过构造锯齿波梯度界面结构实现高强石墨与Ti-6Al-4V(TC4)的熔覆连接,并采用ANSYS有限元软件分析了接头残余热应力的分布规律。结果表明,锯齿波界面结构有效地缓解了接头热应力,获得的应力场有助于抑制裂纹扩展。采用扫描电镜和能谱分析对接头微观组织和界面元素分布进行了分析,界面区域生成约22mm厚的反应层,主要由残留石墨、TC4和反应生成的TiC、VC组成。接头界面结合良好,无裂纹出现。Cladding join of Ti6A14V （TC4） and graphite was realized by constructing a rectangular wave interface between the graphite and TC4. The residual thermal stress was studied by finite element method. The results indicate that this rectangular wave interface effectively releases the residual stress and the stress field in this way can restrain the crack in the joint. The microstructure of the joint is investigated using SEM and EDS. The reaction layer is about 22 mm thick, which consists of residual graphite, TC4 and reactant TiC and VC. It was found that the interface has almost no crack and a thin reaction layer.

关 键 词：熔覆 高强石墨 金属 异质接头 残余热应力 有限元法 

分 类 号：TG456.9[金属学及工艺—焊接]