激光立体成形钛合金角盒的组织与性能研究  

Study on Microstructure and Properties of Laser Stereotyping Titanium Corner Box

作　　者：孙小峰 荣婷 占小红 SUN Xiaofeng;RONG Ting;ZHAN Xiaohong(COMAC Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China;National Engineering and Research Center for Commercial Aircraft Manufacturing,Shanghai 201324,China;Nanjing University of Aeronautics and Astronautics,Nanjing 211100,China)

机构地区：[1]中国商飞上海飞机制造有限公司,上海201324 [2]国家商用飞机制造工程技术研究中心,上海201324 [3]南京航空航天大学,南京211100

出　　处：《航空制造技术》2023年第20期109-117,共9页Aeronautical Manufacturing Technology

摘　　要：民用飞机机翼外翼壁板常采用T型长桁结构,其中机翼根部的长桁连接结构是重要的传力结构,主要采用与之相对应的角盒进行连接。本文利用激光立体成形技术对民用飞机的钛合金长桁对接角盒进行打印制造,并对其显微组织的演变规律、力学性能及缺陷进行研究。研究结果表明,随炉试样内部显微组织为细小杆状的α相,不存在性能的各向异性,均为网篮组织。试块X、Y、Z 3个方向抗拉强度均高于889 MPa,且其偏离X、Y、Z 3个方向的拉伸强度平均值的程度及离散度不超过5%,整体性能较好;试样拉伸断裂属于韧性断裂,拉伸断口由纤维区、放射区、剪切唇区3部分组成,疲劳断裂是塑性断裂,且在疲劳断裂中,二次裂纹连续且密集。加工后试样的尺寸与成形质量都符合行业使用要求。The outer wing wall of civil aircraft is usually constructed with T-truss structure.The long girder connection structure at the root of the wing is a vital force transmission structure.The long truss structure at the root of the wing is mainly connected with the corresponding corner box.In this paper,the evolution rule,mechanical properties,and defects of titanium alloy long girder angle box of civil aircraft were studied by using laser stereotyping technology.The internal microstructure of the furnace sample is small rod-shapedαphase,there is no anisotropy in performance,and is net basket structure.The tensile strength of the test block in the X,Y,and Z directions is higher than 889 MPa,and the degree and dispersion of its deviation from the average tensile strength in three directions of X,Y and Z are not exceeded over 5%,indicating good overall performance;The tensile fracture of the sample belongs to ductile fracture,and the tensile fracture is composed of three parts:fiber zone,radiation zone,and shear lip zone.Fatigue fracture is plastic fracture,and in fatigue fracture,secondary cracks are continuous and dense.The size and forming quality of the processed sample meet industry usage requirements.

关 键 词：民机 钛合金 激光立体成形 显微组织 力学性能 无损检测 

分 类 号：V261.8[航空宇航科学与技术—航空宇航制造工程] TG146.23[一般工业技术—材料科学与工程]