TC4焊接接头的外物冲击损伤微观组织分析  

Microstructure of TC4 welded joint damaged by foreign object

作　　者：纪朝辉[1] 许东成[1] 贾鹏[1] JI Zhaohui XU Dongcheng JIA Peng(Civil Aircraft Airworthiness and Maintenance Key Lab of Tianjin, CA UC, Tianjin 300300, Chin)

机构地区：[1]中国民航大学天津市民用航空器适航与维修重点实验室,天津300300

出　　处：《中国民航大学学报》2016年第6期43-46,共4页Journal of Civil Aviation University of China

基　　金：民航科技创新引导资金项目(MRHD20130104)

摘　　要：采用微束等离子弧在钛合金上进行堆焊，用落锤法模拟发动机压气机叶片工作过程中受到的外物损伤．研究冲击后钛合金母材、热影响区、堆焊层损伤部位的缺口尺寸和微观组织。试验结果表明：冲击缺口深度和宽度随冲击能量的增加而线性增加；冲击能量相同，堆焊层FOD尺寸最大，其次是热影响区．母材缺口尺寸最小；落锤法产生的FOD损伤有表面裂纹、亚表面塑性变形、亚表面微孔、亚表面裂纹和绝热剪切带；冲击功为4～8J时，缺合金母材、热影响区、堆焊层出现微孔，热影响区、堆焊层绝热剪切带的微孔在剪切力的作用下发展成裂纹。FOD （foreign object damage） simulation of aircraft engine compressor blades is conducted by drop hammer method on TC4 welded joint with micro plasma arc welding, studying the micro structure, depth and width of FOD. Results show that the depth and width of FOD increase linearly with the impact absorbing energy. Given the same impact absorbing energy, the size of FOD reaches its maximum at surfacing layer, then at HAZ（heat affected zone）, and minimum at base-metal. The damage form generated by drop hammer method includes surface cracks, subsurface plastic deformation, subsurface microvoid, subsurface cracks and adiabatic shear zones. Given 4-8 J impact absorbing energy, microvoid appeares at the base titanium alloy metal, HAZ as well as surfacing layer, and is developed into cracks under the action of shear forces at HAZ and adiabatic shear zones.

关 键 词：外物冲击损伤 TC4钛合金 焊接接头 微束等离子弧焊接 微观组织 

分 类 号：TG456.2[金属学及工艺—焊接] V232.4[航空宇航科学与技术—航空宇航推进理论与工程]