Research Progress of Friction Stir Additive Manufacturing Technology
LI Huizhao1, WANG Caimei1, ZHANG Hua1(), ZHANG Jianjun1, HE Peng2, SHAO Minghao1, ZHU Xiaoteng1, FU Yiqin3
1.School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China 2.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China 3.China National Petroleum Corporation, Beijing 100724, China
Cite this article:
LI Huizhao, WANG Caimei, ZHANG Hua, ZHANG Jianjun, HE Peng, SHAO Minghao, ZHU Xiaoteng, FU Yiqin. Research Progress of Friction Stir Additive Manufacturing Technology. Acta Metall Sin, 2023, 59(1): 106-124.
This paper summarizes the research progress of friction stir additive manufacturing (FSAM) technology at home and abroad. FSAM is fast-forming, has high additive efficiency, and provides environmental protection. In addition, as a solid-phase additive technology, it effectively avoids shrinkage, porosity, and other defects caused by other melt-additive methods during molding. Currently, reported FSAM methods can be roughly divided into four categories: axial additive manufacturing, radial additive manufacturing, consumable friction-stir tool additive manufacturing, and superimposed plate additive manufacturing. The microstructures and properties of friction stir, laser, and arc additive samples are listed in detail. The advantages and disadvantages of the different additive methods and their application fields are expounded. The companies of friction stir additive equipment, the preliminary applications, and the development direction of friction stir additive equipment designed in the future are introduced. It lays a foundation for further application of friction stir additive technology.
Fund: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology(AWJ-23M08);Cross-Disciplinary Science Foundation from Beijing Institute of Petrochemical Technology(BIPTCSF-013)
About author: ZHANG Hua, professor, Tel: 13521880280, E-mail: huazhang@bipt.edu.cn
Fig.1 Classification of friction stir additive manufacturing (FSAM) methods
Fig.2 Working principle diagram of hot wire friction additive device equipment[56] (a) device working diagram (b) upward view of friction tool head
Fig.3 Schematics of a stationary shaft shoulder cavity additive device (a) schematics of additive structure of stationary shaft shoulder cavity (b) enlarged schematic diagram of cavity and feed hole
Fig.4 Schematics of a spiral groove additive device (a) device working diagram (b) lower end face structure of the shaft shoulder (c) schematic of stirring pin structure
Fig.5 Schematic of spiral groove powder additive device
Fig.6 Schematics of a powder additive device for the feed hole[61] (a) working diagram of friction head (b) top view of the friction head
Fig.7 Schematics of an additive device for square raw material strips (a) 3D cross-sectional view of the additive device (b) plane cutaway view of the container of the system
Fig.8 Schematic of the short rod material additive device
Fig.9 Schematics of a continuous additive device for raw material rod[65] (a) schematic of the device structure (b) sectional view of the feeding mechanism (c) schematic of the end face of the stirring head (d) schematic of the upper clutch module (e) schematic of the lower clutch module
Fig.10 Schematic of a granular additive device
Fig.11 Schematics of a semi-solid-state additive device (a) device working diagram (b) device sectional view
Fig.12 Schematics of a radial circle-by-turn additive device[69] (a) device structure diagram (b) bottom view of the stationary shaft shoulder and the stirring head (c) schematic of stirring head structure (d) schematic of the structure of the static shoulder body (e) schematic of the mold structure (f) schematic of the radial working process
Fig.13 Schematics of a radial layer-by-layer additive device (a) consumable rod lateral additive manufacturing (b) overlay additive strips for lateral additive manufacturing
Fig.14 Schematics of an additive device applied to cooling[75] (a) schematic of the three-dimensional structure of the additive device (b) schematic of the contact between the water cooled blocks and the additive test plates
Material
FSAM method
Microstructure
Mechanical property
Institute
Ref.
304 austenitic stainless steel
Consumable friction stir
tool
Equiaxed crystals
The tensile test results show that the yield strength of the original stainless steel bar and the additive deposited part are 380 and 390 MPa, the tensile strength are 710 and 690 MPa, and the elongation are 50 % and 30 %, respectively
Indian Institute
of Technology
[78]
formed by
dynamic
recrystallization
7075 aluminum alloy
Axial addition of rod
The average hardness of the substrate and the additive raw rod is measured to be 164 HV, and most of the deposited materials exhibit a hardness value higher than 140 HV, comparable to the hardness of the raw rod
Virginia Polytechnic Institute and State University
[79]
2024 aluminum alloy
Superimposed
plate
The microhardness of the substrate is 130 HV, the minimum hardness of the bottom zone of the additive is 74 HV, and the maximum hardness of the top zone of the additive is 99 HV. The changes of the second phase and the grain cause the microhardness of the additive to be lower than that of the substrate
Nanchang Hangkong University
[80]
6561 aluminum alloy
Radial
layer-by-layer
additive
The tensile strength of the substrate and the additive strip is 465.57 MPa, and the maximum tensile strength of the stable additive zone is 203.67 MPa. The microhardness of the substrate and the additive strip is about 155 and 125 HV, respectively. The microhardness of the stable additive zone gradually decreases from the surface of the topmost additve strip to the interior,
but the hardness of the stable additive zone is generally stable at about 60 HV
Northeast Forestry University
[71]
Table 1 Properties and microstructure characteristics of FSAM samples of different materials[71,78-80]
Material
Additive
Stirring center core
Deposition
Deposition cross
Inner deposition
Ref
manufacturing
area
longitudinal
section
region
(AM) method
section
2024-O aluminium alloy
FSAM
Uniform equiaxed grains with an average size of about 9.4 μm
-
-
-
[32]
2024-T6 aluminium alloy
Laser additive manufacturing
-
Stripe shaped microstructures with the ribbon spacing of 0.5 mm
Stripe shaped microstructure
-
[81]
AA2024 aluminum alloy
Arc additive manufacturing
-
-
-
Banded columnar dendrites, equiaxed dendrites, and equiaxed non-dendrites
[82]
Table 2 Microstructure characteristics of FSAM, laser and arc additive samples[32,81,82]
Fig.15 Comparison of microstructures of samples after additive manufacturing (a) microstructure of the central core region of friction stir additive 2024 aluminum alloy[32] (b) cross-sectional microstructure of laser additive manufactured 2024-T6 aluminum alloy[81] (c) longitudinal sectional microstructure of laser additive manufactured 2024-T6 aluminum alloy[81] (d) microstructure of arc additive manufactured AA2024 aluminum alloy (ED—equiaxed dendrite, END—equiaxed non-dendrite, CD—columar dendrite)[82]
AM method
Additive substrate
material
Condition classification
Sampling method of
tensile test
Rp0.2
MPa
Rm
MPa
A
%
H
MPa
Ref.
FSAM
2024-O
Lap welding
Parallel to the horizontal
117.2
227.8
31.1
-
[32]
aluminum alloy
superimposed plate
direction of the additive travel
7N01-T4
Along the direction of
204.0
297.0
19.4
78.0
[83]
aluminum alloy
additive thickness
2024-T4
Stationary shoulder
Along the direction of
267.5
268.2
63.0
72.0-92.0
[74]
aluminum alloy
superimposed plate
additive thickness
Parallel to the horizontal
283.9
284.5
68.5
-
[74]
direction of the additive travel
Laser additive
2024-T6
Parallel deposition of 2024 aluminum alloy powder
Along the direction of
120.7
257.3
5.4
90.3
[81]
manufacturing
aluminum alloy
additive thickness
Cross deposition of
2024 aluminum alloy powder
188.3
348.3
20.5
110.8
[81]
NZ30K-T5
Selective laser melting
Parallel to the horizontal
380.0
406.0
0.9
-
[84]
magnesium
of magnesium alloy
direction of the additive
alloy
powder
travel
6061 aluminum
ER4043 aluminum
Along the direction of
114.7
152.5
33.5
55.3
[85]
alloy
silicon alloy wire
additive thickness
Parallel to the horizontal
119.7
158.8
33.5
-
[85]
direction of the additive travel
Arc additive
AA2024-T6
ER2319 Al-Cu alloy
Parallel to the horizontal
374.0
470.0
8.2
146.0
[82]
manufacturing
aluminum alloy
and ER5087 Al-Mg
direction of the additive travel
alloy wire
Along the direction of
352.0
410.0
2.1
146.0
[82]
additive thickness
AA2024-T4
Parallel to the horizontal
310.0
458.0
12.7
138.0
[82]
aluminum
direction of the additive travel
alloy
Along the direction of
294.0
395.0
5.0
138.0
[82]
additive thickness
AZ31
AZ31B magnesium
Parallel to the horizontal
77.3
235.0
26.3
52.7
[86]
magnesium alloy
alloy welding wire
direction of the additive travel
Vertical to the horizontal
76.0
237.0
22.0
53.2
[86]
direction of additive
manufacturing
5556 aluminum
ER5556 aluminum
Along the direction of
-
310.0
-
125.0
[87]
alloy
alloy welding wire
additive thickness
Table 3 Comparison of tensile property of three ways of additive parts[32,74,81-87]
FSAM
Additive form
Advantage
Disadvantage
Scope of application
method
Axial
Wire material
Low cost; multiple wire
Sustainable
Complex
Carrier rockets, ships; automobiles
direction
uninterrupted
structure;
and other fields; suitable for
feeding holes; high
aluminum alloy ribbed panel
efficiency[59]
additive;
material
structure, inlet, complex frame
high additive
residue in
beam structure of high efficiency,
efficiency
equipment
low cost manufacturing[58]
Powder
Changeable molding
Preparation of new alloys difficult to prepare in equilibrium metallurgical processes[61]
parameters and additive
powder ratio[61]
Raw material
High material utilization
Ultrafine grained homogeneous
rod
and small processing
AM parts and thermoplastic
allowance[63]; expanded
polymers for various metals
additive geometry[62]
and alloys[65]
Granules
Diversified materials and
FSAM of gradient composites[67]
sizes[67]
Various
Manufactruing of composite
FSAM of gradient composites[67]
materials can
materials[67]
be added
Radial
Circle-by-turn
High additive quality; high load-bearing
Low additive
Manufacture of raw materials such
direction
additive components; high bonding strength[69]
efficiency
as metals and metal matrix
composites with different
morphologies[69]
Layer-by-layer
High material utilization; non-polluting
Manufacture of dissimilar alloy
powder raw material; no structural
and light alloy structural parts[71]
limitations[71]
Consumable
Raw bar
Simple equipment method; simple operation
AM of light metal structures such
friction
material
steps; low cost; short manufacturing time;
as aluminum alloy and magnesium
stir tool
fast forming speed[72]
alloy and stainless steel
Superimposed
Lap based on
Simple additive method; simple operation
Applicable to aerospace,
plate
FSW
steps; low cost
automotive parts, ships, and
Stationary
No grinding or cutting after additive
rail transportation fileds; and
shoulder
manufacturing
AM of aluminum alloy, magnesium
Apply cooling
Effectively reduceing the thermal effect[75]
alloy and other light metal
Stirring head
The material mixes more fully[76]
structures, and stainless steel
with special
structure
Add preset
High bonding strength; high joint quality;
heterogeneous
high fracture strength[77]
metal
interlayer
Table 4 Advantages and disadvantages and applicable fields of FSAM different additive methods[58,59,61-63,65,67,69,71,72,75-77]
FSAM
Additive raw material
Additive raw
FSAM method
Preliminary application
equipment unit
material form
Meld Manufacturing
Aluminum alloy,
Metal powders
Axial direction
Printing large metal parts, coating
Company, USA
copper alloy, nickel
and raw
applications; component repair; metal
base alloy, titanium
materials rod
connection; custom metal alloy and metal
alloy
matrix composite blanks and parts
Harbin Institute of
Light alloy parts
Wire
Forming a few meters of aluminum alloy
Technology, China
components; application in aerospace
field; battlefield repair for amphibious
vehicles
Tianjin University,
Aluminum alloy,
Raw materials
Forming a few meters of aluminum
China
aluminum lithium
rod
alloy components
alloy, dissimilar
aluminum alloy
Beijing University of
Aluminum alloy,
Wire
Aluminum alloy stiffened panel structure
Technology, China
magnesium alloy
Nanchang Hangkong
Aluminum alloy
Plate
Static shoulder
Study on microstructure and
University, China
superimposed
mechanical properties of
plate
additive parts
Indian Institute of
Austenitic stainless
Consumable
Consumable
Technology, Indian
steel
raw bar
friction stir tool
material
Virginia Polytechnic
Aluminum alloy
Raw materials
Axial direction
Institute and State
rod
University, USA
Northeast Forestry
Aluminum alloy
Additive strips
Radial direction
University, China
Beijing Institute of
Aluminum alloy
Plate
Superimposed
Technology, China
plate based on
FSW lap
principle
Catholic University of
Metal alloys of
Mixture of
-
FSAM of gradient composites
Louvain, Belgium
different materials
multiple
materials
Table 5 FSAM equipment units and the applications
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