TC4+TC17线性摩擦焊接头的微观组织与力学性能  

Mechanical Properties and Microstructure of Linear Friction Welded TC4+TC17 Joint

作　　者：马铁军[1] 史栋刚[1] 张勇[1] 杨思乾[1] 

机构地区：[1]西北工业大学陕西省摩擦焊接重点实验室,西安710072

出　　处：《航空材料学报》2009年第4期33-37,共5页Journal of Aeronautical Materials

基　　金：航空科学基金资助项目(20061153015);西工大青年科技创新基金资助项目(W016214)

摘　　要：进行了TC4+TC17异种钛合金试件的线性摩擦焊实验,利用光学显微镜、扫描电镜及透射电镜分析了焊接接头的微观组织,并进行了焊后接头的力学性能测试。着重分析了焊接接头的焊缝、近缝区及变形区的组织特点及相变规律,并结合线性摩擦焊的工艺特点,初步分析了形变组织的形成机理。实验结果表明,利用合理的焊接工艺参数,用线性摩擦焊方法可获得可靠的TC4+TC17钛合金焊接接头,接头的拉伸性能优于TC4母材。TC4与TC17接头的焊缝区为等轴细晶组织,两侧近缝区、变形区的组织形貌差异较大。The linear friction welding （LFW） experiment of the dissimilar titanium alloys （TC4 ＋ TC17） was carried out with homemade LFW machine （XMH-160）. By means of optical microscopy（ OM ） , scanning electron microscopy （SEM） and transmission electron microscopy （TEM） , the microstructure of joint was analyzed in detail. The characteristic of microstructure was described, with particular emphasis on the discipline of phase transition in the weld zone, the near weld zone and the deformation zone. The microstructure of the weld is ultra-fine equiaxial grain, while the microstructures in the near weld zone and the deformation zone are very different from each other of two sides of the weld. Combining with the behavior of the linear friction welding, the formation mechanism of the different microstructures was analyzed respectively combining. The tensile test result shows that the tensile strength of the joint exceeds that of the parent TC4 alloy. It indicates that, therefore, using linear friction welding a sound TC4 ＋ TC17 joint can be obtained with reasonable welding parameters.

关 键 词：异种钛合金 线性摩擦焊 组织 性能 

分 类 号：TG453.9[金属学及工艺—焊接]