CN113210909A - Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer - Google Patents
Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer Download PDFInfo
- Publication number
- CN113210909A CN113210909A CN202010054530.XA CN202010054530A CN113210909A CN 113210909 A CN113210909 A CN 113210909A CN 202010054530 A CN202010054530 A CN 202010054530A CN 113210909 A CN113210909 A CN 113210909A
- Authority
- CN
- China
- Prior art keywords
- additive manufacturing
- cmt
- cladding layer
- magnesium alloy
- welding gun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000654 additive Substances 0.000 title claims abstract description 83
- 230000000996 additive effect Effects 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 82
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 57
- 238000005253 cladding Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 62
- 238000003466 welding Methods 0.000 claims description 55
- 238000012545 processing Methods 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims 1
- 238000000265 homogenisation Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 43
- 238000012360 testing method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000007545 Vickers hardness test Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Plasma & Fusion (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a method for improving the surface performance of a magnesium alloy CMT additive manufacturing cladding layer. The high-speed rotation of the stirring head can ensure that the tissues in the stirring area are dynamically recrystallized under large strain and a certain temperature, the grains are further refined, the second phase is violently crushed and dissolved, and the homogenization degree and the surface hardness of the tissues are greatly improved.
Description
Technical Field
The invention adopts the stirring friction treatment method to carry out surface modification on the CMT cladding layer of the magnesium alloy, and the method can eliminate the internal defects of the cladding layer, refine crystal grains and improve the surface hardness of the magnesium alloy cladding layer.
Background
Cold Metal Transfer (CMT) is taken as a novel welding process technology without splashing, external back suction force is adopted to promote short circuit transition of molten drops, and meanwhile, improvement is made on the aspect of waveform control of voltage and current, so that welding heat input is greatly reduced, and higher deposition rate and more excellent welding stability are achieved. Based on the advantages, the CMT has wide application prospect in the aspect of welding of metals sensitive to heat input, such as magnesium alloy and the like.
However, even in this case, the magnesium alloy exhibits characteristics different from those of other materials in arc welding due to its unique properties, and has problems such as easy oxidation, large tendency to pores and thermal cracks in the welded layer, coarse microstructure grains, and large tendency to thermal stress. Magnesium has high affinity with oxygen, and can form magnesium oxide and magnesium hydroxide at normal temperature. In addition, because the degassing is incomplete in the casting process, the gas content of the cast magnesium alloy is too high, and the gas in the casting enters a molten pool through solid solution or diffusion during the deposition forming, so that the gas cannot escape in time during the solidification to form a gas hole. The magnesium alloy has high thermal conductivity, so that the formed welding seam and a near seam area are easily overheated, and the problem of grain growth is serious. Therefore, there is a need for a post-treatment technique to improve the texture and properties of the CMT cladding layer of magnesium alloys.
As a novel Processing method, Friction Stir Processing (FSP) is based on the principle of Friction Stir welding, and utilizes the high-speed rotation and movement of a stirring head to cause severe plastic deformation, mixing, crushing and accompanying dynamic recrystallization of a material in a Processing area, so as to refine grains, crush coarse second phases, eliminate defects such as pores and the like, thereby remarkably improving the microstructure of an alloy and improving the mechanical properties of the alloy. In addition, the friction stir processing has a series of advantages as follows: harmful gas and noise are not generated, and the environment is green and pollution-free; high-speed processing can be realized; the shape, the rotating speed, the advancing speed and the like of the stirring head are flexibly adjustable, so that the surface processing thickness and range can be conveniently selected, and the processing area tissue can be conveniently regulated and controlled; extra heating equipment is not needed, and the energy efficiency is high; the operation is simple, and the repeatability is good; solid state processing has little influence on the base material, and effectively solves the problem that materials such as magnesium alloy and the like are easy to deform in hot processing. Therefore, after the CMT additive manufacturing, the magnesium alloy cladding layer is subjected to friction stir processing, so that the crystal grains which are coarsened by heating can be effectively refined, and the second phase structure can be obviously reduced along with the second phase solid solution, so that the strength and the corrosion resistance of the cladding layer are greatly improved. Therefore, the friction stir processing of the fusion welding bonding surface is a better process for improving the structural performance of the magnesium alloy additive manufacturing component.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for improving the surface performance of a magnesium alloy CMT additive manufacturing cladding layer aiming at the problems of air holes, cracks, coarse structures and the like in the magnesium alloy CMT cladding forming layer.
The technical purpose of the invention is realized by the following technical scheme:
a method for improving the surface performance of a cladding layer manufactured by a magnesium alloy CMT additive manufacturing process includes the steps of carrying out friction stir processing on the cladding layer obtained by CMT additive manufacturing, pressing a stirring pin of friction stir welding into the cladding layer, keeping a shaft shoulder of the friction stir welding and the cladding layer tightly pressed, and carrying out friction stir welding processing on the cladding layer, wherein the stirring speed is 300-800 r/min, and the walking speed is 30-80 mm/min.
Moreover, the stirring head is a conical stirring pin with screw threads, the length of the stirring pin is 3-5 mm, the diameter of a shaft shoulder is 10-15 mm, and the backward inclination angle of the stirring pin is 2-5 degrees.
And the stirring and rubbing treatment is carried out, the stirring speed is 500-800 r/min, and the walking speed is 30-60 mm/min.
The method adopts the swing welding mode of the subject group to carry out magnesium alloy additive manufacturing, and carries out subsequent friction stir processing, specifically: and in each layer of additive manufacturing, a CMT welding gun is swung outwards by taking a central line of the layer of additive manufacturing as a symmetry axis from an initial position, runs to an amplitude vertex at a certain angle deviating from the central line of the additive manufacturing to form an isosceles triangle of a CMT running track, swings outwards in the opposite direction at the same angle, runs to the amplitude vertex, runs to the position of the central line of the additive manufacturing to form an isosceles triangle of the CMT running track, and repeats to reach an end position of the layer of additive manufacturing to finish the layer of additive manufacturing.
Furthermore, the certain angle from the additive manufacturing centre line is 30-60 degrees, preferably 45 degrees.
And the dry elongation of the welding gun is 10-18mm, preferably 12-15 mm, the wire feeding speed is 8-14m/min, preferably 10-13m/min, the welding gun walking speed is 10-90cm/min, preferably 30-70cm/min, the shielding gas of the cold metal transition welding gun adopts one of nitrogen, helium and argon, and the airflow of the shielding gas of the cold metal transition welding gun adopts 12-25L/min, preferably 15-20L/min.
Moreover, triangular swing is adopted when outward swinging is carried out, the frequency is 1-5Hz, and the amplitude is 1-15mm, preferably 6-8 mm; the residence time of the CMT at the peak position of the amplitude is 0.1 to 0.5s, preferably 0.2 to 0.3 s; the residence time of the CMT at the intersection of the running track and the additive manufacturing centerline is 0.1-0.5 s, preferably 0.2-0.3 s.
According to the invention, the magnesium alloy cladding layer is prepared by adopting a CMT process, the cladding layer with good wetting property and a smoother surface is obtained by a swing welding method, and then the cladding layer is subjected to stirring friction treatment. The stirring head is inclined backwards during processing, the pressing amount of the shaft shoulder of the stirring head is manually regulated, the processed fusion coating layer has good quality, and the surface has no defects of grooves, cracks and the like. The high-speed rotation of the stirring head can ensure that the tissues in the stirring area are dynamically recrystallized under large strain and a certain temperature, the grains are further refined, the second phase is violently crushed and dissolved, and the homogenization degree and the surface hardness of the tissues are greatly improved.
Drawings
FIG. 1 is a photograph of a magnesium alloy CMT swing welding additive manufacturing object in the invention.
FIG. 2 is a photograph showing a real object of a stirring head used in the friction stir processing of the present invention.
FIG. 3 is a photograph of a magnesium alloy CMT additive manufactured part subjected to friction stir processing according to the present invention.
Fig. 4 is an XRD phase analysis of the magnesium alloy CMT additive manufacturing test piece and the magnesium alloy CMT additive manufacturing test piece after friction stir treatment.
FIG. 5 is a microstructure photograph of a magnesium alloy CMT additive manufacturing test piece and a magnesium alloy CMT additive manufacturing test piece after friction stir processing.
FIG. 6 is a Vickers hardness distribution curve diagram of a magnesium alloy CMT additive manufacturing test piece and a magnesium alloy CMT additive manufacturing test piece after friction stir processing.
Fig. 7 is a schematic process diagram (1) of additive manufacturing of a magnesium alloy CMT in the present invention.
Fig. 8 is a schematic process diagram (2) of additive manufacturing of a magnesium alloy CMT in the present invention.
FIG. 9 is a schematic diagram of the process of friction stir welding of the cladding layer after the additive manufacturing of the magnesium alloy CMT.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
The experimental base material is AZ91 magnesium alloy, the specification of a test piece is 300 multiplied by 150 multiplied by 6mm, and an AZ91 welding wire with the diameter of 1.2mm is selected as the welding wire. A magnesium alloy program and a cold metal transition technology are adopted to carry out a magnesium alloy arc additive manufacturing test, and a CMT welding machine is selected as a CMT Advanced 4000 type welding machine of the Funis company. The friction stir processing apparatus is a gantry type two-dimensional friction stir welding apparatus of model HT-JM16 × 15/2 manufactured by suzhou space engineering equipment ltd.
The method mainly comprises the following steps:
1. before the test, a steel wire brush is used for removing an oxide film on a magnesium alloy substrate until the metallic luster is exposed, oil stains and dirt on the surface of a welding position are cleaned and dried by blowing, and after the oxide film is removed, welding is carried out within 2 hours so as not to generate a new oxide film.
2. Welding parameters are set, and additive manufacturing of the magnesium alloy is carried out by adopting a swing welding mode, and what needs to be explained is that the application is a research of carrying out subsequent treatment after additive manufacturing of the magnesium alloy is realized by adopting outer swing CMT, so the technical scheme of realizing additive manufacturing of the magnesium alloy by adopting outer swing CMT is firstly explained in the application.
As shown in fig. 7, a fixture is used on a worktable to fix a substrate, the deposition direction of additive manufacturing is vertical to the substrate, additive manufacturing of a first layer is performed from left to right by CMT, after the first layer reaches a right-side cut-off position, additive manufacturing of a next layer is performed from right to left, and after the first layer reaches a left-side cut-off position, additive manufacturing of the next layer is performed from left to right, so that the whole additive manufacturing (i.e., the deposition process) is realized. In this embodiment, only a single layer and multiple passes of additive manufacturing are performed to form a layer of magnesium alloy.
As shown in fig. 8, the triangular swing of the CMT torch is schematically illustrated, and the trajectory shown in fig. 8 can be obtained by looking down (i.e., looking down) from the CMT torch position during the additive manufacturing process shown in fig. 7. Specifically, in fig. 8, the triangular graph is a motion trajectory of the CMT welding gun in the additive manufacturing of one layer, and the horizontal direction is a central line of each layer of additive manufacturing, in each layer of additive manufacturing, the CMT welding gun performs outward swinging by taking the central line of the layer of additive manufacturing as a symmetry axis from a starting position, travels to an amplitude vertex at a certain angle deviated from the central line of additive manufacturing, travels to a central line position of additive manufacturing to form an isosceles triangle of a CMT travel trajectory, performs outward swinging in the opposite direction at the same angle, travels to the amplitude vertex, travels to the central line position of additive manufacturing to form an isosceles triangle of the CMT travel trajectory, and repeats to reach an end position of the layer of additive manufacturing to finish the additive manufacturing of the cost layer. In FIG. 8, the deviation angle is 45 degrees, the swing welding frequency is 5HZ, the swing welding amplitude is 8mm, the residence time of the left and right middle three points is 0.2s, the wire feeding speed is 12m/min, the overall traveling speed of the welding gun is 0.6m/min, and the flow of the shielding gas is 15L/min. Fig. 1 is a photograph of CMT fusion coating formation (i.e., CMT additive manufacturing) of a magnesium alloy material in accordance with the present invention. During welding, reciprocating welding is adopted, and a welding gun deviates 6mm on the basis of the previous boundary. As can be seen in FIG. 1, the contact angle and surface morphology of the magnesium alloy cladding layer have been improved using the CMT swing welding process.
3. Stirring friction treatment of magnesium alloy CMT cladding layer by using stirring friction welding equipment
As shown in figure 2, the stirring head is a conical threaded stirring pin with the length of 5mm, the diameter of a shaft shoulder of 15mm and the backward inclination angle of the stirring pin of 2.5 degrees. As shown in figure 9, after a cladding layer is obtained by magnesium alloy CMT additive manufacturing, a stirring pin of friction stir welding is pressed into the cladding layer, a shaft shoulder of the friction stir welding is kept to be pressed tightly with the cladding layer, and the cladding layer is subjected to friction stir welding treatment, wherein the stirring speed is 500r/min, the walking speed is 60mm/min, and an s-shaped walking track is adopted. The surface appearance after treatment is shown in figure 3, and has no defects such as grooves, cracks and the like.
4. Cutting the magnesium alloy CMT additive manufacturing sample subjected to friction stir processing and the CMT additive manufacturing sample without surface modification through wire cutting, and comparing the samples, wherein the steps comprise: (1) XRD phase analysis of the magnesium alloy CMT additive manufacturing test piece and the magnesium alloy CMT additive manufacturing test piece after friction stir treatment, as shown in figure 4, (a) the magnesium alloy CMT additive manufacturing test piece, (b) the magnesium alloy CMT + FSP additive manufacturing test piece, the magnesium alloy CMT test piece after friction stir treatment has obviously improved alpha-Mg diffraction peak, which indicates that the friction stir treatment causes a large amount of Al element to be dissolved into alpha-Mg, so that a second phase beta-Mg which exists between grain boundaries in a net shape is formed17Al12The number is reduced, and the distribution is more dispersed; (2) the microstructure of the magnesium alloy CMT additive manufacturing test piece is compared with that of the magnesium alloy CMT additive manufacturing test piece after friction stir treatment, and as shown in figure 5, (a) the magnesium alloy CMT additive manufacturing test piece, and (b) the magnesium alloy CMT + FSP additive manufacturing test piece have smaller and more uniform crystal grains due to the friction stir treatment.
5. Vickers hardness test
Taking the cross section observed by the macroscopic tissue morphology for Vickers hardness test, wherein the experimental parameters are as follows: 100gf load, load time 15 s. Hardness curves were made from the data obtained, as shown in fig. 6. The vickers hardness of the samples after the friction stir treatment was higher than that of the CMT cladding layer samples.
The modification of the cladding layer in the CMT additive manufacturing of the magnesium alloy can be realized by adjusting the process parameters according to the content of the invention, and the test shows that the performance is basically consistent with the invention. The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (7)
1. A method for improving the surface performance of a cladding layer manufactured by a magnesium alloy CMT additive manufacturing process is characterized in that the cladding layer manufactured by CMT additive manufacturing is subjected to friction stir processing, a stirring pin of friction stir welding is pressed into the cladding layer, a shaft shoulder of the friction stir welding is kept to be pressed tightly with the cladding layer, and the cladding layer is subjected to friction stir welding processing, wherein the stirring speed is 300-800 r/min, and the walking speed is 30-80 mm/min; in the CMT additive manufacturing, a cold metal transition welding gun is used for providing a heat source for the additive manufacturing process, the welding gun is perpendicular to the surface of a workpiece, in each layer of additive manufacturing, the CMT welding gun carries out the additive manufacturing by taking a central line of the layer as a symmetry axis from a starting position, runs to an amplitude vertex at a certain angle deviated from the additive manufacturing central line, then runs to the position of the additive manufacturing central line to form an isosceles triangle of a CMT running track, then carries out the additive manufacturing in the opposite direction at the same angle, runs to the position of the additive manufacturing central line after running to the amplitude vertex to form an isosceles triangle of the CMT running track, and repeats the steps to reach the end position of the layer of additive manufacturing to finish the layer of additive manufacturing.
2. The method of claim 1, wherein the pin is a tapered threaded pin having a length of 3-5 mm, a shoulder diameter of 10-15 mm, and a back-rake angle of 2-5 °.
3. The method for improving the surface performance of the cladding layer in the CMT additive manufacturing of the magnesium alloy according to claim 1, wherein the friction stir processing is performed at a stirring speed of 500-800 r/min and a traveling speed of 30-60 mm/min.
4. The method of claim 1, wherein the outward swinging is performed by a triangular swing with a frequency of 1-5Hz and an amplitude of 1-15mm, the dwell time of the CMT at the peak of the amplitude is 0.1-0.5 s, the dwell time of the CMT at the intersection of the trajectory and the center line of the additive manufacturing is 0.1-0.5 s, and the angle from the center line of the additive manufacturing is 30-60 degrees.
5. The method for improving the surface performance of the cladding layer manufactured by the magnesium alloy CMT additive manufacturing method according to claim 1, wherein the outward swinging is performed by adopting triangular swinging, the frequency is 1-5Hz, and the amplitude is 6-8 mm; the residence time of the CMT at the position of the amplitude peak is 0.2-0.3 s; the retention time of the CMT at the intersection point of the running track and the additive manufacturing central line is 0.2-0.3 s; the certain angle from the additive manufacturing centerline is 45 degrees.
6. The method for improving the surface performance of the cladding layer in the additive manufacturing of the magnesium alloy CMT according to claim 1, wherein in the additive manufacturing of the CMT outer pendulum, the dry elongation of a welding gun is 10-18mm, the wire feeding speed is 8-14m/min, the walking speed of the welding gun is 10-90cm/min, one of nitrogen, helium and argon is adopted as the shielding gas of the cold metal transition welding gun, and the flow of the shielding gas of the cold metal transition welding gun is 12-25L/min.
7. The method for improving the surface performance of the cladding layer in the additive manufacturing of the magnesium alloy CMT according to claim 1, wherein in the additive manufacturing of the CMT outer pendulum, the dry elongation of a welding gun is 12-15 mm, the wire feeding speed is 10-13m/min, the walking speed of the welding gun is 30-70cm/min, one of nitrogen, helium and argon is adopted as the shielding gas of the cold metal transition welding gun, and the flow of the shielding gas of the cold metal transition welding gun is selected from 15-20L/min.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010054530.XA CN113210909A (en) | 2020-01-17 | 2020-01-17 | Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010054530.XA CN113210909A (en) | 2020-01-17 | 2020-01-17 | Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer |
Publications (1)
Publication Number | Publication Date |
---|---|
CN113210909A true CN113210909A (en) | 2021-08-06 |
Family
ID=77084943
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202010054530.XA Pending CN113210909A (en) | 2020-01-17 | 2020-01-17 | Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN113210909A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113828908A (en) * | 2021-11-17 | 2021-12-24 | 黄山学院 | Non-linear interpolation variable-track friction stir welding process |
CN114147340A (en) * | 2021-11-12 | 2022-03-08 | 广东省科学院中乌焊接研究所 | Aluminum alloy additive manufacturing method assisted by friction stir processing |
CN114951924A (en) * | 2022-05-28 | 2022-08-30 | 上海航天精密机械研究所 | Electric arc additive manufacturing method for magnesium alloy cabin with inner flange structure |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007319931A (en) * | 2006-05-02 | 2007-12-13 | Osaka Industrial Promotion Organization | Friction stir working method and backing fixture for friction stir working |
CN106166640A (en) * | 2016-08-18 | 2016-11-30 | 上海闵轩钢结构工程有限公司 | A kind of high-strength steel and the welding procedure of aluminium alloy |
CN109590625A (en) * | 2019-01-16 | 2019-04-09 | 福州大学 | A kind of electric arc increases the composite manufacturing method of material forming and mixing yoghurt |
CN109623097A (en) * | 2018-12-23 | 2019-04-16 | 南京理工大学 | A kind of compound increasing material device of MIG-TIG |
CN109623180A (en) * | 2019-01-28 | 2019-04-16 | 东北大学 | A kind of silk material electric arc increasing material manufacturing method of magnesium alloy |
CN110465948A (en) * | 2019-09-09 | 2019-11-19 | 北京配天技术有限公司 | The planing method of welding robot and its swinging track |
CN110640407A (en) * | 2019-10-24 | 2020-01-03 | 秦皇岛信越智能装备有限公司 | Automatic welding and assembling production line for automobile aluminum alloy box body |
-
2020
- 2020-01-17 CN CN202010054530.XA patent/CN113210909A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007319931A (en) * | 2006-05-02 | 2007-12-13 | Osaka Industrial Promotion Organization | Friction stir working method and backing fixture for friction stir working |
CN106166640A (en) * | 2016-08-18 | 2016-11-30 | 上海闵轩钢结构工程有限公司 | A kind of high-strength steel and the welding procedure of aluminium alloy |
CN109623097A (en) * | 2018-12-23 | 2019-04-16 | 南京理工大学 | A kind of compound increasing material device of MIG-TIG |
CN109590625A (en) * | 2019-01-16 | 2019-04-09 | 福州大学 | A kind of electric arc increases the composite manufacturing method of material forming and mixing yoghurt |
CN109623180A (en) * | 2019-01-28 | 2019-04-16 | 东北大学 | A kind of silk material electric arc increasing material manufacturing method of magnesium alloy |
CN110465948A (en) * | 2019-09-09 | 2019-11-19 | 北京配天技术有限公司 | The planing method of welding robot and its swinging track |
CN110640407A (en) * | 2019-10-24 | 2020-01-03 | 秦皇岛信越智能装备有限公司 | Automatic welding and assembling production line for automobile aluminum alloy box body |
Non-Patent Citations (1)
Title |
---|
姚巨坤: "镁合金CMT-电弧增材再制造工艺与组织性能研究", 《工具技术》 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114147340A (en) * | 2021-11-12 | 2022-03-08 | 广东省科学院中乌焊接研究所 | Aluminum alloy additive manufacturing method assisted by friction stir processing |
CN113828908A (en) * | 2021-11-17 | 2021-12-24 | 黄山学院 | Non-linear interpolation variable-track friction stir welding process |
CN114951924A (en) * | 2022-05-28 | 2022-08-30 | 上海航天精密机械研究所 | Electric arc additive manufacturing method for magnesium alloy cabin with inner flange structure |
CN114951924B (en) * | 2022-05-28 | 2023-08-11 | 上海航天精密机械研究所 | Arc additive manufacturing method for magnesium alloy cabin with inner flange structure |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN113210909A (en) | Method for improving surface performance of magnesium alloy CMT additive manufacturing cladding layer | |
WO2020156224A1 (en) | Wire and arc additive manufacturing method for magnesium alloy | |
Barmouz et al. | On the role of processing parameters in producing Cu/SiC metal matrix composites via friction stir processing: investigating microstructure, microhardness, wear and tensile behavior | |
Cong et al. | Effect of arc mode in cold metal transfer process on porosity of additively manufactured Al-6.3% Cu alloy | |
Cong et al. | The effects of ultrasonic frequency pulsed arc on wire+ arc additively manufactured high strength aluminum alloys | |
Mok et al. | Deposition of Ti–6Al–4V using a high power diode laser and wire, Part I: Investigation on the process characteristics | |
Li et al. | A comparative study on the employment of heat treatment, electric pulse processing and friction stir processing to enhance mechanical properties of cold-spray-additive-manufactured copper | |
CN106757001A (en) | The method and apparatus that electromagnetic agitation auxiliary carries out laser melting coating under a kind of pressure cooler environment | |
CN108570634A (en) | A kind of plastic deformation processing method preparing high-strength highly-conductive aluminium alloy | |
CN108441859A (en) | Enhance wear-resisting laser cladding coating of Ni bases and preparation method thereof using Nb elements | |
CN110453216B (en) | Laser cladding device for coating crack self-healing and processing method thereof | |
CN114150203A (en) | Laser cladding in-situ self-generated high-entropy alloy gradient coating and preparation method thereof | |
CN105543838A (en) | Remanufacturing method for marine crankshaft | |
CN112756789A (en) | Laser-arc composite additive manufacturing method for aluminum-lithium alloy large-scale component | |
CN112894123A (en) | Friction stir welding method for aluminum-copper dissimilar metal | |
CN114346368A (en) | Arc additive manufacturing method for silicon-magnesium-containing alloy | |
CN109807559A (en) | A kind of silk material electric arc increasing material manufacturing method of Al-Si alloy | |
CN114682800A (en) | Method for manufacturing eutectic high-entropy alloy plate by ultrasonic rolling surface strengthening laser additive | |
Xie et al. | Printing high-strength high-elongation aluminum alloy using commercial ER2319 welding wires through deformation-based additive manufacturing | |
Zhou et al. | Friction stir welding of wire arc additively manufactured 205A aluminum alloy: Microstructure and mechanical properties | |
Chen et al. | Effect of cold metal transfer mix synchro-pulse process on the overall morphology, microstructure and mechanical properties of wire+ arc additively manufactured AA2219 alloy | |
Xie et al. | Efficient depositing aluminum alloy using thick strips through severe deformation-based friction rolling additive manufacturing: processing, microstructure, and mechanical properties | |
CN107858617A (en) | The method that low-rotate speed mixing yoghurt was modified and prepared wear-resistant titanium surface to titanium surface | |
Zheng et al. | Sedimentation suppression and precipitation regulation of WC-reinforced particles in plasma arc deposited Ni-based coatings via an alternating magnetic field | |
Chen et al. | Effects of laser shock peening on the properties and microstructure evolution of laser-polished surface of Cr12 steel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210806 |