Microstructural Characterization and Tensile Behavior of TA1 Titanium Alloy Sheet Welded by Electron Beam Welding

2021 ◽  
Vol 1027 ◽  
pp. 149-154
Author(s):  
Sen Dong Gu ◽  
Ji Peng Zhao ◽  
Rui Jie Ouyang ◽  
Yong Hong Zhang
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Electron Beam Welding ◽  
Base Material ◽  
Optical Microscope ◽  
Alloy Sheet ◽  
Tensile Behavior ◽  
Electron Backscattered Diffraction

In the present study, TA1 titanium alloy sheets with a thickness of 0.8mm were welded by electron beam welding. Microstructure of the welded region was investigated using optical microscope and electron backscattered diffraction. Then, the tensile test was conducted to analyse the tensile behavior of the welded sheets as well as the fractography of the fracture surfaces. It is shown that the mean grain size in the heat-affected zone is smaller than that in the fusion zone and base material. The strength of the base metal is lower than that of the fusion zone and heat-affected zone. The average values of the yield strength, tensile strength and elongation of the tensile specimens are 224MPa, 335MPa and 35%, respectively. In addition, the tensile specimens of the welded sheets suffer both ductile and brittle deformation during the tensile tests.

Relationship between the Textures and the Elastic Moduli of Electron Beam Welded Joint in Ti-6Al-4V Titanium Alloy

2014 ◽  
Vol 936 ◽  
pp. 1910-1917
Author(s):  
Xing Zhi Li ◽  
Shu Bing Hu
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Elastic Modulus ◽  
Elastic Moduli ◽  
Electron Beam Welding ◽  
Base Material ◽  
X Ray Diffraction ◽  
Electron Backscattered Diffraction ◽  
Α Phase ◽  
Transmission Electron

The microstructure, texture and elastic modulus of electron beam welding joint in Ti-6Al-4V titanium alloy were investigated by transmission electron microscopy, X-ray diffraction, electron back scattered diffraction and nanoindentation techniques. The α phase was in the majority, and a {0001} <-2110> texture of α phase was observed in the base material. A very weak {11-23} <-1-122> texture of α phase was in the fuse zone. Most of the α grain boundaries in the fuse zone were high-angle boundaries by electron backscattered diffraction, and it also confirmed that the orientations of α phase had a nearly random distribution in the fuse zone. The maximum average elastic modulus value measured by the nanoindentation techniques was in the base material due to the effect of the {0001} <-2110> texture. The average elastic moduli of three different zones in the joint were 134.8±3.5Gpa, 125.5±5.8Gpa and 123.0±4.7Gpa, respectively.

Mechanical Properties of Forged Ti-6Al-4V Structure by Electron Beam Welding

2012 ◽  
Vol 455-456 ◽  
pp. 308-313
Author(s):  
Hong Yu Qi ◽  
Jian Xie ◽  
Shao Lin Li ◽  
Xiao Guang Yang
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Fusion Zone ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Base Material ◽  
Structure Design ◽  
Large Gradient ◽  
Welded Structure ◽  
Aero Engine

The blisk (bladed disk) is a new structural component of the modern aero-engine and plays an important role in improving its performance. Ti-6Al-4V alloy joints welded by electron beam have been widely used for compressor blisk in advanced aero engine. It is necessary to analyze microstructure and mechanical properties of Ti-6Al-4V welded structure by electron beam welding (EBW) for failure analysis and structure design of blisk. Microstructure of Ti-6Al-4V welded structure by EBW was investigated by microscopic observation and micro indentation testing. Experiment results show grain coarsening in fusion zone (FZ) and heat affected zone (HAZ) appears large gradient organization structure, which presents significant local heterogeneity. On the centerline perpendicular to the welding direction, Vickers microhardness was measured in increments of 1mm, 0.5mm, 0.25mm and 0.1mm. Due to the presence of martensite, microhardness of the fusion zone is about 20% higher than that of the base material. The size of joints in different regions was acquired, 2.5 to 3.0-mm-wide in FZ and about 0.7-mm-wide in HAZ respectively. Three different types of EBW samples were designed for tensile test, including welded structure, welded joint and base material. Three different stress-strain curves of specimens were acquired, including welded joint. The experiment data indicates that the tensile strength of welded joints is 8% more than that of the base metal.

scholarly journals Features of the structural phase state of a weld produced by electron-beam welding in the submicrocrystalline grade 2 titanium alloy

2018 ◽  
Vol 143 ◽  
pp. 03011
Author(s):  
Kirill Kurgan ◽  
Vasily Klimenov ◽  
Anatoly Klopotov ◽  
Sergey Gnyusov ◽  
Yuri Abzaev ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Heat Affected Zone ◽  
Electron Beam Welding ◽  
Structural Phase ◽  
Weld Zone ◽  
Distribution Patterns ◽  
High Concentration ◽  
Factors Affecting ◽  
Microhardness Distribution

This paper presents the results of structural studies for a welded joint of the Grade 2 titanium alloy in submicrocrystalline and microcrystalline states produced by electron beam welding when joining 2-mm-thick plates. Microhardness distribution patterns of the Grade-2 titanium alloy in micro- and submicrocrystalline states are identified in the weld zone and heat-affected zone. These patterns reflect a difference in structural phase states. It is assumed that one of the key factors affecting both the structural state and microhardness distribution in the weld zone and heat-affected zone during electron-beam welding is high concentration of oxygen atoms embedded into the crystal lattice of α–Ti-based solid solution.

Effect of Electron Beam Welding on Microstructure and Mechanical Properties of Spray-Deposited Al-Zn-Mg-Cu Alloy

2013 ◽  
Vol 302 ◽  
pp. 230-235
Author(s):  
Feng Wang ◽  
Yu Ting Zuo ◽  
Bai Qing Xiong ◽  
Yon Gan Zhang ◽  
Hong Wei Liu ◽  
...  
Keyword(s):  
Electron Beam ◽  
Fusion Zone ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Electron Beam Welding ◽  
Spray Atomization ◽  
Test Results ◽  
Cu Alloy ◽  
Equiaxed Grains ◽  
Strengthening Phases

In this study, Al-8.6Zn-2.6Mg-2.2Cu (wt,%) alloy was synthesized by the spray atomization and deposition technique. Electron beam welding (EBW) joint in the spray-deposited Al-8.6Zn-2.6Mg-2.2Cu alloy is composed of fusion zone, heat affected zone and base metal region. The microstructure of the fusion zone has been found to be very fine equiaxed grains, and the microstructure of the heat affected zone is mainly composed of α-Al and Al/MgZn2 eutectic microstructure. Extensive microhardness measurements were conducted in the weld regions of the nuggets exhibited a hardness loss in the fusion zone due to the loss of strengthening phases. Tensile properties test results indicated that tensile strength of these welds approached 82.3~85.3% of the base metal. The analysis of fracture surface has confirmed that the specimen fractured within the weld region during tensile test.

scholarly journals Fine microstructure of electron beam welding joint in fusion zone of large thickness titanium alloy

2017 ◽  
Vol 47 (9) ◽  
pp. 941-945 ◽  
Author(s):  
Qi GAO ◽  
ZhiQian LIAO ◽  
ZhiYing LIU ◽  
FuYang GAO ◽  
Peng JIANG
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Fusion Zone ◽  
Electron Beam Welding ◽  
Welding Joint ◽  
Large Thickness ◽  
Fine Microstructure

scholarly journals Electron beam welding of rectangular copper wires applied in electrical drives

2021 ◽  
Author(s):  
Tamás Tóth ◽  
Jonas Hensel ◽  
Sven Thiemer ◽  
Philipp Sieber ◽  
Klaus Dilger
Keyword(s):  
Electron Beam ◽  
Oxygen Content ◽  
Electron Beam Welding ◽  
Base Material ◽  
Fusion Welding ◽  
Eb Welding ◽  
Technological Parameters ◽  
Low Level ◽  
Residual Oxygen ◽  
Ofe Copper

AbstractThe so-called hairpin winding technology, which is specially tailored to electrical traction components, deploys rectangular plug-in copper wires in the stator. The fusion welding of the adjacent wire ends is associated with challenges due to the high thermal conductivity as well as the porosity formation of the copper. During this study, the electron beam (EB) welding of electrolytic tough pitch (ETP) and oxygen-free electronic grade (OFE) copper connectors was investigated. Subsequently, the specimens underwent X-ray computed tomography (CT) and metallographic examinations to characterize the joints. It was discovered that the residual oxygen content of the base material is responsible for the pore formation. With only a very low level of oxygen content in the copper, a porosity- and spatter-free welding can be reproducibly realized using the robust EB welding technology, especially for copper materials. By optimizing the parameters accordingly, joints exhibiting a low level of porosity were achieved even in the case of the alloy containing a high amount of residual oxygen. Beyond this, detailed analyses in terms of pore distribution were carried out and a good correlation between technological parameters and welding results was determined.

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