Microstructures and fatigue properties of electron beam welds with beam oscillation for heavy section TC4-DT alloy  

作　　者：Fu Pengfei Mao Zhiyong Zuo Congjin Wang Yajun Wang Chunming 

机构地区：[1]College of Materials Science and Engineering,Huazhong University of Science and Technology [2]Science and Technology on Power Beam Processes Laboratory,Beijing Aeronautical Manufacturing Technology Research Institute [3]Institute of Mechanical Engineering and Automation,Beihang University

出　　处：《Chinese Journal of Aeronautics》2014年第4期1015-1021,共7页中国航空学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.50935008);Special Major Science and Technology of China(No.2010ZX04007041);the National Key Laboratory of High Energy Density Beam Processing Technology of China

摘　　要：With the development of the manufacturing technology, electron beam welding（EBW） is capable of producing titanium alloy large parts in aero fields. To increase the applications and improve the properties, EBW with beam oscillation was investigated on TC4-DT alloy with50 mm thickness. We detected the welding samples by X-ray NDT, observed the microstructures of the welds, and tested the fatigue properties of the joints. The results showed that EBW with beam oscillation improved the weld morphology as well as welding quality, and the microstructure homogeneity of the welds and HAZ along the weld penetration were also improved. The fatigue properties of the joints with beam oscillation were more excellent than those of conventional EBW, even equal to those of the base metal under high stresses. The influences of the processing and the microstructure on the properties with beam oscillation were discussed.With the development of the manufacturing technology, electron beam welding（EBW） is capable of producing titanium alloy large parts in aero fields. To increase the applications and improve the properties, EBW with beam oscillation was investigated on TC4-DT alloy with50 mm thickness. We detected the welding samples by X-ray NDT, observed the microstructures of the welds, and tested the fatigue properties of the joints. The results showed that EBW with beam oscillation improved the weld morphology as well as welding quality, and the microstructure homogeneity of the welds and HAZ along the weld penetration were also improved. The fatigue properties of the joints with beam oscillation were more excellent than those of conventional EBW, even equal to those of the base metal under high stresses. The influences of the processing and the microstructure on the properties with beam oscillation were discussed.

关 键 词：Beam oscillation Electron beam welding（EBW） FATIGUE MICROSTRUCTURE Titanium alloy 

分 类 号：TG407[金属学及工艺—焊接] TG457.19