Effect of Hydrogen on Microstructure of TA15 Electron Beam Welded Joint

2011 ◽  
Vol 287-290 ◽  
pp. 2393-2396 ◽  
Author(s):  
Xin Liu ◽  
Zhi Yong Mao ◽  
Yong Ping Lei
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Weld Metal ◽  
Hydrogen Content ◽  
Welded Joints ◽  
Welded Joint ◽  
Hydrogen Charging ◽  
Β Phase ◽  
Ta15 Titanium Alloy ◽  
Certainty Level

Microstructures of electron beam welded joints for TA15 titanium alloy with different hydrogen contents were observed and analyzed by SEM and TEM. And the influence of hydrogen on microstructure of the joints was investigated. The results show that the microstructure of the weld metal is lamellar α+β phase after hydrogen charging. In the range of hydrogen contents discussed in this study (from 0 to 0.101 wt%), With the increase of hydrogen content, there is little change in the appearance of the microstructure of the weld metal. The presence of hydrogen can promote the growth of twins in electron beam welded joints. With the increase of hydrogen content, the number of twins is increased. When hydrogen content reaches to a certainty level, hydrides are found in TA15 electron beam welded joints.

Influence of Hydrogen on Microstructure of Electron Beam Welded Joint

2013 ◽  
Vol 753-755 ◽  
pp. 367-371
Author(s):  
Xin Liu ◽  
Zhi Yong Mao
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Weld Metal ◽  
Hydrogen Content ◽  
Welded Joints ◽  
Welded Joint ◽  
Optical Microscope ◽  
Hydrogen Charging ◽  
Tc4 Titanium Alloy ◽  
Oxygen Analyzer

Hydrogen distributions of TC4 electron beam welded joints with different hydrogen contents were measured by hydrogen oxygen analyzer. Microstructures of electron beam welded joints for TC4 titanium alloy with different hydrogen contents were observed and analyzed by optical microscope and TEM. And the influence of hydrogen on microstructure of the joints was investigated. The results show that the hydrogen content of weld HAZ is higher than other zones in the electron beam welded joints, while the hydrogen content of fusion zone is lower than other zones in the electron beam welded joints. The microstructure of the weld metal is fine lamellar α + β phase after hydrogen charging. In the range of hydrogen contents discussed in this study (from 0 to 0.101 wt. %), with the increase of hydrogen content, there is little change in the appearance of the microstructure of the weld metal. There are stacking fault and dislocation in the microstructure of TC4 electron beam welded joints with different hydrogen contents after hydrogen charging. The presence of hydrogen can promote the formation of twins in electron beam welded joints. With the increase of hydrogen content, the number of twins is increased.

scholarly journals Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2233
Author(s):  
Tatyana Olshanskaya ◽  
Vladimir Belenkiy ◽  
Elena Fedoseeva ◽  
Elena Koleva ◽  
Dmitriy Trushnikov
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Weld Metal ◽  
Thermal Effect ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Parent Metal ◽  
Cooling Rates ◽  
Structures And Properties

The application of electron beam sweep makes it possible to carry out multifocal and multi-beam welding, as well as combine the welding process with local heating or subsequent heat treatment, which is important when preparing products from thermally-hardened materials. This paper presents a method of electron beam welding (EBW) with dynamic beam positioning and its experimental-calculation results regarding the formation of structures and properties of heat-resistant steel welded joints (grade of steel 20Cr3MoWV). The application of electron beam oscillations in welding makes it possible to change the shape and dimensions of welding pool. It also affects the crystallization and formation of a primary structure. It has been established that EBW with dynamic beam positioning increases the weld metal residence time and the thermal effect zone above the critical A3 point, increases cooling time and considerably reduces instantaneous cooling rates as compared to welding without beam sweep. Also, the difference between cooling rates in the depth of a welded joint considerably reduces the degree of structural non-uniformity. A bainitic–martensitic structure is formed in the weld metal and the thermal effect zone throughout the whole depth of fusion. As a result of this structure, the level of mechanical properties of a welded joint produced from EBW with dynamic electron beam positioning approaches that of parent metal to a greater extent than in the case of welding by a static beam. As a consequence, welding of heat-resistant steels reduces the degree of non-uniformity of mechanical properties in the depth of welded joints, as well as decreases the level of hardening of a welded joint in relation to parent metal.

Characterization of Friction Stir Welded Joints in TA15 Titanium Alloy Plates

2011 ◽  
Vol 138-139 ◽  
pp. 852-857
Author(s):  
Fei Fei Xie ◽  
Chun Ping Huang ◽  
Chun Lin Dong ◽  
Li Ming Ke
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Welded Joints ◽  
Travel Speed ◽  
Flow State ◽  
Friction Stir ◽  
Β Phase ◽  
Transverse Tensile ◽  
Plastic Materials ◽  
Ta15 Titanium Alloy

Friction stir welding (FSW) was applied to TA15 titanium alloy plates. Welds were produced by employing rotational speed of 375rpm and a travel speed of 23.5mm/min.The microstructure and mechanical properties of friction stir welded joints were investigated. Flow pattern of the materials also were analysed. The stir zone (SZ) was characterized by α-phase and β-phase, but the size of the grain in the middle of the SZ was much finer than that of the upper. The interface between the base metal (BM) and SZ is associated with the flow state of the plastic materials. Results of transverse tensile test indicated that all the joints exhibited lower tensile strength than the BM, and the maximum tensile strength of the as-welded joint is about 97.6% of the average strength of the BM.

Effect of TIG-Welding on the Structure and Mechanical Properties of the Pseudo-β Titanium Alloy VT19 Welded Joints

2018 ◽  
Vol 927 ◽  
pp. 112-118 ◽  
Author(s):  
S.V. Akhonin ◽  
V.Yu. Belous ◽  
V.A. Berezos ◽  
R.V. Selin
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Welded Joints ◽  
Welded Joint ◽  
Tig Welding ◽  
Filler Wire ◽  
Β Phase ◽  
Flux Layer ◽  
Approximate Amount ◽  
Different Parts

Analysis of the TIG-welding impact on the structure and mechanical properties of pseudo-β titanium alloy VT19 welded joints, obtained with different welding speed, different filler wire amount in welded joint, with and without flux layer. Microstructure of obtained welded joints were investigated. Using welded joints microsections approximate amount of β-phase in different parts of welds have been obtained. Mechanical properties of the obtained welded joints were analyzed and dependency of tensile strength and amount of β-phase were build.

Linear Friction and Electron Beam Welded Joints of Ti2AlNb/TC11

2010 ◽  
Vol 97-101 ◽  
pp. 3895-3898 ◽  
Author(s):  
Li Jun Tan ◽  
Ze Kun Yao ◽  
Chun Qin ◽  
Hong Zhen Guo ◽  
Shi Qiong Li
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Welded Joints ◽  
Welded Joint ◽  
Aerospace Industry ◽  
Friction Process ◽  
Dissimilar Joining ◽  
Linear Friction ◽  
Technical Interest ◽  
O Phase

Dissimilar joining of Ti-22Al-25Nb alloy and an α+β titanium alloy TC11 were carried out using electron beam process and linear friction process, respectively. The microstructure and tensile properties of the joints were investigated. The results show that both EBW and LFW could be adopted to the dissimilar joining of Ti-22Al-25Nb/TC11. The EB welded joint exhibits higher strength than that of the LF welded joint, due to the precipitation of O phase in the fusion zone of the former one. These results can be expected to be of great technical interest as basic data for the use of EBW or LFW in aerospace industry.

scholarly journals Influence of the welding parameters on the weld metal mechanical heterogeneity of EP517 (Fe12Cr2NiMoWVNb) steel and 36NKhTYu (Fe36Ni12Cr3TiAl) alloy dissimilar welded joints

2021 ◽  
Vol 2077 (1) ◽  
pp. 012001
Author(s):  
K T Borodavkina ◽  
E V Terentyev ◽  
A P Sliva ◽  
A Yu Marchenkov ◽  
I E Zhmurko ◽  
...  
Keyword(s):  
Electron Beam ◽  
Standard Deviation ◽  
Weld Metal ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Welding Parameters ◽  
Mechanical Heterogeneity ◽  
Alloy 36Nkhtyu ◽  
Hardness Values

Abstract The article presents the results of assessing the effect of the welding speed and the displacement of the electron beam relative to the joint on the mechanical heterogeneity of the weld metal of dissimilar welded joints of EP517 (Fe12Cr2NiMoWVNb) steel and 36NKhTYu (Fe36Ni12Cr3TiAl) alloy. Aging curves are plotted for the weld metal of welded joints made at electron beam welding (EBW) speeds of 30 m/h and 120 m/h, as well as for the weld metal of the welded joint made at a speed of 30 m/h with various electron beam displacements. An assessment of the change in the mechanical heterogeneity of the weld metal was carried out by the change in the standard deviation of the hardness values, and metallographic studies were also carried out. It was found that a decrease in the EBW speed leads to a decrease in the standard deviation of the results of measuring the hardness of the weld metal after aging from 45 to 14 HV5 or from 18% to 6%. It was also found that an increase in the displacement of the electron beam to alloy 36NKhTYu (Fe36Ni12Cr3TiAl) to 60% leads to an increase in the hardness of the weld metal from 225 to 305 HV5 (by 35%).

Influence of Residual Stresses on the Weld Metal Hardness of 5V Titanium Alloy

2021 ◽  
Vol 410 ◽  
pp. 359-365
Author(s):  
Egor V. Terentyev ◽  
Artem Yu. Marchenkov ◽  
Ksenia T. Borodavkina
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Residual Stresses ◽  
Weld Metal ◽  
Welded Joints ◽  
Arc Welding ◽  
Electron Beam Welding ◽  
The Difference ◽  
Metal Hardness ◽  
Hardness Values

Influence of residual welding stresses on the hardness values of the weld metal is studied. The investigations were carried out on 5V titanium alloy welded joints, obtained by electron-beam welding and argon-arc welding (TIG-welding). It is shown that the nature of the residual stresses distribution depends on the parameters of welding and affects the hardness values of the weld metal. It is shown, that the difference between the hardness values of the metal after welding and the metal after partial relief of residual stresses on the investigated alloy is up to 90 MPa, which is about 3% of the weld metal hardness level.

Microstructure Appearance of TC4 Titanium Alloy Welded Join by Pulsed Electron Beam

2020 ◽  
Vol 982 ◽  
pp. 143-150
Author(s):  
Hai Lin Dai ◽  
Rui Zhao Du ◽  
Yun He ◽  
Shuai Xing ◽  
Fang Jun Liu
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Electron Beam ◽  
Weld Metal ◽  
Pulsed Electron Beam ◽  
Tc4 Titanium Alloy ◽  
Β Phase ◽  
Α Phase ◽  
Fast Cooling ◽  
Cooling Velocity

Study on microstructure appearance of 3 mm thick TC4 titanium alloy welded join by common electron beam and pulsed electron beam were carried out. Experimental results show that pulsed electron beam improved grain size and decreased the cooling velocity of weld metal by oscillation and fast cooling effect, the acicular martensite decomposes β phase and transforms to finer and more α′ phase, which shows an interwoven pattern.

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