Abstract

The dissimilar titanium alloys Ti70/TA5 are welded by using electron beam welding. The microstructure and mechanical properties of the welded joints are systematically investigated, and the welding parameters are optimized. Results show that the fusion zone (FZ) is mainly α’ martensite, and the heat-affected zone (HAZ) in the Ti70 side consists of fine α’ martensite, residual α phase, and original β phase, while the HAZ in the TA5 side is composed of coarser α phase, serrated and acicular α phase. Transmission electron microscope (TEM) analysis demonstrates that the martensite in the FZ presents the lath-like morphology. There are high-density dislocations within martensite, which has a certain orientation relationship with the β phase. Under the appropriate welding procedure, the tensile strength of the dissimilar joint is close to that of the TA5 base metal. The joint fracture dominantly presents the characteristic of ductile fracture. During welding, electron beam scanning is beneficial to improving the solidification of molten pool and grain refinement; thus, the mechanical property of the welded joint is increased to a certain extent.

References

1.
Gorynin
,
I. V.
,
1999
, “
Titanium Alloys for Marine Application
,”
Mater. Sci. Eng. A
,
263
(
2
), pp.
112
116
. 10.1016/S0921-5093(98)01180-0
2.
Lin Prakash
,
P. S.
,
Rajak
,
B.
,
Panda
,
S. K.
,
Roy
,
G. G.
,
Jha
,
M. N.
, and
Mascarenhas
,
M.
,
2017
, “
Mechanical Properties and Stretch Forming Behaviour of Electron Beam Welded Titanium Sheets of Grade-2 and Grade-5
,”
Mater. Today: Proc.
,
2
(
4
), pp.
908
916
. 10.1016/j.matpr.2017.01.102
3.
Xu
,
W. F.
, and
Zhang
,
Z. L.
,
2016
, “
Microstructure and Mechanical Properties of Laser Beam Welded TC4/TA15 Dissimilar Joints
,”
Trans. Nonferrous Met. Soc. China
,
26
(
12
), pp.
3135
3146
. 10.1016/S1003-6326(16)64445-X
4.
Wang
,
S. Q.
,
Li
,
W. Y.
,
Zhou
,
Y.
,
Li
,
X.
, and
Chen
,
D. L.
,
2016
, “
Tensile and Fatigue Behavior of Electron Beam Welded Dissimilar Joints of Ti-6Al-4V and IMI834 Titanium Alloys
,”
Mater. Sci. Eng. A
,
649
, pp.
146
152
. 10.1016/j.msea.2015.09.107
5.
Pederson
,
R.
,
Niklasson
,
F.
,
Skystedt
,
F.
, and
Warren
,
R.
,
2012
, “
Microstructure and Mechanical Properties of Friction-and Electron-Beam Welded Ti-6Al-4V and Ti-6Al-2Sn-4Zr-6Mo
,”
Mater. Sci. Eng. A
,
552
, pp.
555
565
. 10.1016/j.msea.2012.05.087
6.
Adamus
,
J.
,
Lacki
,
P.
, and
Motyka
,
M.
,
2015
, “
EBW Titanium Sheets as Material for Drawn Parts
,”
Arch. Civ. Mech. Eng.
,
15
(
1
), pp.
42
47
. 10.1016/j.acme.2014.04.004
7.
Wang
,
S. Q.
,
Liu
,
J. H.
, and
Chen
,
D. L.
,
2013
, “
Strain-Controlled Fatigue Properties of Dissimilar Welded Joints Between Ti-6Al-4V and Ti17 Alloys
,”
Mater. Des.
,
49
, pp.
716
727
. 10.1016/j.matdes.2013.02.034
8.
Wang
,
S. Q.
,
Liu
,
J. H.
, and
Chen
,
D. L.
,
2013
, “
Tensile and Fatigue Properties of Electron Beam Welded Dissimilar Joints Between Ti-6Al-4V and BT9 Titanium Alloys
,”
Mater. Sci. Eng. A
,
584
, pp.
47
56
. 10.1016/j.msea.2013.07.009
9.
Wang
,
S. Q.
,
Li
,
W. Y.
,
Jing
,
K.
,
Zhang
,
X. Y.
, and
Chen
,
D. L.
,
2017
, “
Microstructural Evolution and Mechanical Properties of Electron Beam Welded Dissimilar Titanium Alloy Joints
,”
Mater. Sci. Eng. A
,
697
, pp.
224
232
. 10.1016/j.msea.2017.05.028
10.
Zhang
,
H.
,
Hu
,
S. S.
,
Shen
,
J. Q.
,
Li
,
D. L.
, and
Bu
,
X. Z.
,
2015
, “
Effect of Laser Beam Offset on Microstructure and Mechanical Properties of Pulsed Laser Welded BTi-6431S/TA15 Dissimilar Titanium Alloys
,”
Opt. Laser Technol.
,
74
, pp.
158
166
. 10.1016/j.optlastec.2015.06.006
11.
Yeganeh
,
V. E.
, and
Li
,
P. J.
,
2017
, “
Effect of Beam Offset on Microstructure and Mechanical Properties of Dissimilar Electron Beam Welded High Temperature Titanium Alloys
,”
Mater. Des.
,
124
, pp.
78
86
. 10.1016/j.matdes.2017.03.056
12.
Li
,
R. F.
,
Li
,
Z. G.
,
Zhu
,
Y. Y.
, and
Rong
,
L.
,
2011
, “
A Comparative Study of Laser Beam Welding and Laser-MIG Hybrid Welding of Ti-Al-Zr-Fe Titanium Alloy
,”
Mater. Sci. Eng. A
,
528
(
3
), pp.
1138
1142
. 10.1016/j.msea.2010.09.084
13.
Chowdhury
,
S.
,
Yadaiah
,
N.
,
Khan
,
S. M.
,
Ozah
,
R.
,
Das
,
B.
, and
Muralidhar
,
M.
,
2018
, “
A Perspective Review on Experimental Investigation and Numerical Modeling of Electron Beam Welding Process
,”
Mater. Today: Proc.
,
5
(
2
), pp.
4811
4817
. 10.1016/j.matpr.2017.12.055
14.
Wang
,
S. G.
, and
Wu
,
X. Q.
,
2012
, “
Investigation on the Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Joints With Electron Beam Welding
,”
Mater. Des.
,
36
, pp.
663
670
. 10.1016/j.matdes.2011.11.068
15.
Chamanfar
,
A.
,
Pasang
,
T.
,
Ventura
,
A.
, and
Misiolek
,
W. Z.
,
2016
, “
Mechanical Properties and Microstructure of Laser Welded Ti-6Al-2Sn-4Zr-2Mo (Ti6242) Titanium Alloy
,”
Mater. Sci. Eng. A
,
663
, pp.
213
224
. 10.1016/j.msea.2016.02.068
16.
Xu
,
P. Q.
,
Li
,
L. J.
, and
Zhang
,
C. B.
,
2014
, “
Microstructure Characterization of Laser Welded Ti-6Al-4V Fusion Zone
,”
Mater. Charact.
,
87
, pp.
179
185
. 10.1016/j.matchar.2013.11.005
17.
Malinov
,
S.
,
Sha
,
W.
,
Guo
,
Z.
,
Tang
,
C. C.
, and
Long
,
A. E.
,
2001
, “
Synchrotron X-ray Diffraction Study of the Phase Transformations in Titanium Alloys
,”
Mater. Charact.
,
48
(
4
), pp.
279
295
. 10.1016/S1044-5803(02)00286-3
18.
Hsieh
,
C. T.
,
Shiue
,
R. K.
,
Huang
,
R. T.
, and
Tsay
,
L. W.
,
2016
, “
The Effect of Post-Weld Heat Treatment on the Microstructure and Notched Tensile Fracture of Ti-15V-3Cr-3Al-3Sn to Ti-6Al-4V Dissimilar Laser Welds
,”
Mater. Sci. Eng. A
,
653
, pp.
139
146
. 10.1016/j.msea.2015.12.013
19.
Ahmed
,
T.
, and
Rack
,
H. J.
,
1998
, “
Phase Transformations During Cooling in α+β Titanium Alloys
,”
Mater. Sci. Eng. A
,
243
(
1-2
), pp.
206
211
. 10.1016/S0921-5093(97)00802-2
20.
Sabol
,
J. C.
,
Pasang
,
T.
,
Misiolek
,
W. Z.
, and
Williams
,
J. C.
,
2012
, “
Localized Tensile Strain Distribution and Metallurgy of Electron Beam Welded Ti-5Al-5V-5Mo-3Cr Titanium Alloys
,”
J. Mater. Process. Technol.
,
212
(
11
), pp.
2380
2385
. 10.1016/j.jmatprotec.2012.06.023
21.
Gao
,
F. Y.
,
Li
,
P. Y.
,
Jiang
,
P.
, and
Liao
,
Z. Q.
,
2018
, “
The Effect of Constraint Conditions on Microstructure and Properties of Titanium Alloy Electron Beam Welding
,”
Mater. Sci. Eng. A
,
721
, pp.
117
124
. 10.1016/j.msea.2018.02.069
22.
Chen
,
Z. Y.
,
Li
,
J. W.
,
Liu
,
J.
,
Wang
,
Q. J.
,
Liu
,
J. R.
, and
Yang
,
R.
,
2010
, “
Creep Behavior of Fusion Zone and Base Metal of the Electron Beam Weldments of a Near-Alpha Titanium Alloy
,”
J. Mater. Sci. Technol.
,
26
(
6
), pp.
564
571
. 10.1016/S1005-0302(10)60086-2
23.
Liu
,
H.
,
Nakata
,
K.
,
Yamamoto
,
N.
, and
Liao
,
J.
,
2011
, “
Mechanical Properties and Strengthening Mechanisms in Laser Beam Welds of Pure Titanium
,”
Sci. Technol. Weld. Join.
,
16
(
7
), pp.
581
585
. 10.1179/1362171811Y.0000000054
24.
Junaid
,
M.
,
Khan
,
F. N.
,
Baksh
,
N.
,
Baig
,
M. N.
, and
Rahman
,
K.
,
2018
, “
Study of Microstructure, Mechanical Properties and Residual Stresses in Full Penetration Electron Beam Welded Ti-5Al-2.5Sn Alloy Sheet
,”
Mater. Des.
,
139
, pp.
198
211
. 10.1016/j.matdes.2017.11.009
25.
Zeng
,
L.
, and
Bieler
,
T. R.
,
2005
, “
Effects of Working, Heat Treatment, and Aging on Microstructural Evolution and Crystallographic Texture of α, α’, α'’ and β Phases in Ti-6Al-4V Wire
,”
Mater. Sci. Eng. A
,
392
(
1-2
), pp.
403
414
. 10.1016/j.msea.2004.09.072
26.
Kim
,
Y.
,
Song
,
Y. B.
, and
Lee
,
S. H.
,
2015
, “
Microstructure and Intermediate-Temperature Mechanical Properties of Powder Metallurgy Ti-6Al-4V Alloy Prepared by the Prealloyed Approach
,”
J. Alloys Compd.
,
637
, pp.
234
241
. 10.1016/j.jallcom.2015.03.019
27.
Karpagaraj
,
A.
,
Sivashanmugam
,
N.
, and
Sankaranarayanasamy
,
K.
,
2015
, “
Some Studies on Mechanical Properties and Microstructural Characterization of Automated TIG Welding of Thin Commercially Pure Titanium Sheets
,”
Mater. Sci. Eng. A
,
640
, pp.
180
189
. 10.1016/j.msea.2015.05.056
28.
Wang
,
T.
,
Yu
,
B.
,
Han
,
K.
,
Peng
,
F.
,
Jiang
,
S. Y.
,
Zhao
,
H. H.
,
Zhang
,
B. G.
, and
Feng
,
J. C.
,
2019
, “
Effect of Heat Input on Microstructure and Mechanical Properties of Ti/Cu66V34/Cu Joints by Electron Beam Welding
,”
J. Manuf. Process.
,
45
, pp.
147
153
. 10.1016/j.jmapro.2019.07.005
29.
Su
,
M. L.
,
Li
,
J. N.
,
Liu
,
K. G.
,
Qi
,
W. J.
,
Weng
,
F.
,
Zhang
,
Y. B.
, and
Li
,
J. S.
,
2019
, “
Mechanical Property and Characterization of TA1 Titanium Alloy Sheets Welded by Vacuum Electron Beam Welding
,”
Vacuum
,
159
, pp.
315
318
. 10.1016/j.vacuum.2018.10.027
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