CN116551239A - High-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of automobile exhaust system and preparation method thereof - Google Patents
High-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of automobile exhaust system and preparation method thereof Download PDFInfo
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- CN116551239A CN116551239A CN202310587474.XA CN202310587474A CN116551239A CN 116551239 A CN116551239 A CN 116551239A CN 202310587474 A CN202310587474 A CN 202310587474A CN 116551239 A CN116551239 A CN 116551239A
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- 230000003647 oxidation Effects 0.000 title claims abstract description 65
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 65
- 239000000654 additive Substances 0.000 title claims abstract description 30
- 230000000996 additive effect Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 76
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 230000004907 flux Effects 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 14
- 229910052721 tungsten Inorganic materials 0.000 claims description 14
- 239000003814 drug Substances 0.000 claims description 9
- 238000005238 degreasing Methods 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 229940079593 drug Drugs 0.000 claims description 7
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- 238000000034 method Methods 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 2
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 abstract description 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 description 18
- 230000007797 corrosion Effects 0.000 description 18
- 230000003197 catalytic effect Effects 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
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- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
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- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- 230000004584 weight gain Effects 0.000 description 1
- 235000019786 weight gain Nutrition 0.000 description 1
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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system and a preparation method thereof, wherein a low-carbon steel belt is adopted as a sheath, and a flux core consists of the following components in percentage by mass: 0.03% -0.07% of C, 0.5% -1.0% of Si, 0.1% -0.5% of Mo, 2.0% -3.0% of Cu, 1.5% -6.0% of Al, 16.0% -18.0% of Cr, 6.0% -8.0% of Mn, 0.5% -1.0% of Ni, 0.5% -2.0% of Nb, 0.5% -1.0% of Ti, 0.03% -0.1% of Ce, 0.5% -1.5% of W and the balance of iron powder, wherein the flux-cored powder is filled into a U-shaped groove rolled by a low-carbon steel belt, rolled and then drawn, and is used for reducing the high-temperature oxidation rate by about 90% when the additive manufacturing of a 439 type ferrite stainless steel pipeline of an automobile exhaust system, and the weld performance meets the requirements of automobile welding quality standard.
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system and a preparation method thereof.
Background
In recent years, with the implementation of the European VI standard in 1 st 2013 in Europe, the exhaust system of the automobile is also comprehensively implemented in China with the corresponding grade of emission standard, and the exhaust temperature is also continuously increased with the continuous increase of the exhaust emission standard, and is as high as 950-1050 ℃. The type 439 and type 409 ferritic stainless steel developed in recent years has the characteristics of low cost, low linear expansion coefficient, high strength, good thermal conductivity, high corrosion resistance and the like, and becomes a preferred material of an exhaust system. Particularly, the manifold and the front pipe at the high temperature end have higher requirements on high temperature performance such as high temperature fatigue, thermal fatigue, high temperature oxidation and the like because the parts are directly connected with the engine. Catalytic converters in automotive exhaust systems are subjected to three-way catalysis, the effective catalytic action of which occurs at ambient temperatures exceeding 1000 ℃, and materials and welds for the catalytic converter housing are also required to have good resistance to high temperature oxidation. Meanwhile, the catalytic converter is easy to contact with the outside because the catalytic converter is positioned, particularly an automobile used in coastal and snowmelt areas, the catalytic converter shell is also easy to be subjected to high-temperature salt corrosion, and the high-temperature salt corrosion resistance of weld metal is also important.
At present, for welding of an automobile exhaust system, particularly for welding of 439 type ferrite stainless steel which occupies most of materials of the automobile exhaust system, the welding problem is mainly focused on improving the plasticity and toughness of joints and controlling the welding cost, but for welding joints under high-temperature environment (more than 800 ℃) such as a middle pipe, a muffler and a tail pipe of the automobile exhaust system, the research on high-temperature oxidation resistance is very little, so that a flux-cored wire which is feasible and corresponds to the welding is not available.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to provide a high temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, in which the high temperature oxidation resistance, corrosion resistance and thermal fatigue performance of a welded joint in a high temperature environment (above 800 ℃) are improved by nearly one time.
The invention further aims to provide a preparation method of the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of the automobile exhaust system, and the preparation method is simple in process.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises a sheath and a flux core, wherein the sheath adopts a low-carbon steel belt, and the flux core consists of the following components in percentage by mass: c:0.03% -0.07%, si:0.5% -1.0%, mo:0.1% -0.5%, cu:2.0% -3.0%, al:1.5% -6.0%, cr:16.0% -18.0%, mn:6.0% -8.0%, ni:0.5% -1.0%, nb:0.5% -2.0%, ti:0.5% -1.0%, ce:0.03% -0.1%, W:0.5% -1.5% and the balance of iron powder.
Preferably, the width of the low-carbon steel strip adopted by the sheath is 10-12mm, and the thickness is 0.4-0.8mm.
Preferably, the sheath adopts a low-carbon steel strip with the following components in percentage by mass: c:0.01% -0.1%, si:0.05% -0.2%, mn:0.1% -0.5%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, N is less than or equal to 0.005%, nb:0.01% -0.20.2%, ti:0.005% -0.1%, mo:0.1% -1.0%, and the balance of Fe and unavoidable impurities.
Preferably, the filling rate of the medicine core is controlled between 19% and 23%.
Preferably, the component content of the drug core satisfies: when the content of W is 0.5% -1.5%, the content of Ce is 0.03% -0.1%, and W/ce=20: 1, the welded joint has excellent high-temperature oxidation resistance and thermal fatigue resistance at this ratio.
Preferably, cr and W are added in the form of metal, mn is added in the form of electrolytic manganese, ti is added in the form of ferrotitanium, C is added in the form of graphite, and Ce is added in the form of cerium oxide powder.
Preferably, the component particle size of the drug core is 80-200 mesh.
Preferably, the component content of the drug core satisfies: the contents of the impurity elements S and P are each less than 0.03%.
Preferably, the component content of the drug core satisfies: ti/nb=1: 2.
preferably, the low-carbon steel strip comprises the following components: ti/nb=1: 2.
preferably, the component content of the drug core satisfies: cu/al=1: 2.
after the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system is welded, the oxidation rate of the high-temperature oxidation resistant 439Ti flux-cored wire is reduced by about 90% in an air environment at 900 ℃, and weld metal of the high-temperature oxidation resistant 439Ti flux-cored wire has excellent high-temperature oxidation resistance and excellent welding process and mechanical properties. The bonding strength of the base material and the welding seam meets the application requirement of dynamic and static load under a high-temperature environment, multi-layer and multi-channel overlaying can be realized to meet different welding seam thicknesses, and the inter-layer temperature is controlled to be lower than 100 ℃ during multi-layer welding so as to reduce embrittlement of a welded joint. The design idea of the high-temperature oxidation resistant 439Ti flux-cored wire is as follows: in the flux core, a very small amount of C element can improve the strength of the welding seam, si and Mn play a deoxidization role in the welding seam and compensate oxidation resistance when the Cr content is low, mo improves the strength, hardness and corrosion resistance of welding seam metal, cu improves the corrosion resistance of the welding seam metal and improves the plasticity of the welding seam metal, al improves the oxidation resistance of the welding seam metal under the room temperature and high temperature environment, cr improves the corrosion resistance of the welding seam, ni improves the toughness of the welding seam, nb and Ti improves the intergranular corrosion resistance of the welding seam, W, ce coordinates addition of refined crystal grains and improves the high temperature oxidation resistance, corrosion resistance and toughness of the welding seam, wherein the following components have the following roles:
c: can react with other alloy elements to form carbide, and has the function of solid solution strengthening to weld metal.
Si: has arc stabilizing effect, and deoxidizing effect when the content is less than 1%, and oxidation resistance when Cr content is low.
Mn: at the position ofA layer of MnCr is formed between the substrate and the outer oxide skin 2 O 4 The anti-cycle oxidation performance of the welding seam is improved, abnormal oxidation is restrained, the strength of an oxidation layer of the welding seam is enhanced, and the stripping of the oxidation layer is prevented.
Mo: the stability of the passivation film on the surface of the welding line is improved, and the resistance of the automobile to chloride stress corrosion in a high-temperature salt corrosion environment is improved.
Cu: inhibit the occurrence of anodic dissolution of the welding seam and improve the corrosion resistance of the welding seam.
Al: the weld joint has excellent oxidation resistance at high temperature.
Cr: the method is favorable for forming a stable oxide film on the welding seam and reducing the intergranular corrosion sensitivity of the welding seam.
Ni: the plasticity and toughness of the welding seam are improved, and the corrosion resistance of the welding seam in corrosive media is enhanced.
Nb: and the alloy is combined with redundant C elements of the welding line to form a stable compound NbC, so that the formation of a chromium-poor region of the welding line is prevented, and the intergranular corrosion resistance of the welding line is improved.
Ti: and the stable compound TiN is formed by combining with redundant N elements of the welding seam, so that the formation of a chromium-poor region of the welding seam is prevented, and the intergranular corrosion resistance of the welding seam is improved.
W: has strong fine grain strengthening effect, and can effectively improve the heat resistance, high-temperature strength and oxidation resistance of the welding seam at high temperature for a long time.
Ce: the transformation of columnar crystals in the heat affected zone of the weld joint to equiaxed crystals is promoted, the crystal grains are refined, the sensitization of the chromium-poor zone of the weld joint is reduced, and the corrosion resistance and toughness of the weld joint are improved.
The second aspect of the invention also provides a preparation method of the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following steps:
step 1: weighing the components according to the proportion, uniformly mixing, and drying for 1h in a dryer at 250-300 ℃ to obtain flux-cored powder;
step 2: the low carbon steel strip is placed on a strip placing machine of a welding wire forming machine, the low carbon steel strip is rolled into a U-shaped groove through a pressing groove of the forming machine, the flux-cored powder obtained in the step 1 is filled into the U-shaped groove, the U-shaped groove is rolled and closed through the forming machine, then the flux-cored powder is drawn to the diameter of 1.0-1.2mm, and oil stains and moisture on the surface of the welding wire are removed through a degreasing machine and a dryer, so that the welding wire is obtained.
The third aspect of the invention also provides application of the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system in 439 type ferrite stainless steel pipeline welding of the automobile exhaust system, wherein the welding current is 90-120A, the arc voltage is 14-16V, and the welding speed is 25-30cm/min.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of the automobile exhaust system has good arc stability, small welding spatter, attractive weld joint formation, high deposition speed and capability of performing all-position welding, and the weld joint metal has excellent high-temperature oxidation resistance and relatively high joint toughness, and when the high-temperature oxidation resistant 439Ti flux-cored wire is applied to welding of a 439 ferrite stainless steel pipeline in the automobile exhaust system, the average oxidation rate of the weld joint in an air environment at 800 ℃ is 0.018mg/cm 2 H, the high-temperature oxidation rate is reduced by about 90%, the tensile strength is also obviously improved, and the weld performance meets the requirements of the automobile welding quality standard GB/T18344-2016.
2. The invention is used for the high temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, the element W and the rare earth element Ce are added in coordination, and the added W can form Laves phases (Fe and Cr) in ferrite stainless steel 2 The (Nb, W) has high melting point and hardness, is stable at high temperature, is not dissolved and is not easy to grow, so that the unbalanced tissue state at high temperature strength can be kept at a higher temperature, and the high-temperature oxidation resistance and heat resistance of the welding seam are improved. However, since the Laves phase reduces the plasticity and toughness of the weld, it is necessary to add an appropriate amount of rare earth element Ce to form a dispersed fine Laves phase, thereby refining grains and inhibiting growth of the grains, and thus improving the toughness of the weld.
Detailed Description
The present invention will be described in further detail with reference to examples, but the scope of the present invention is not limited to the examples.
The following example provides a high temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises a sheath and a flux core, wherein the sheath adopts a low carbon steel strip with the width of 10-12mm and the thickness of 0.4-0.8mm, and the components and the mass percentages thereof are as follows: c:0.01% -0.1%, si:0.05% -0.2%, mn:0.1% -0.5%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, N is less than or equal to 0.005%, nb:0.01% -0.20.2%, ti:0.005% -0.1%, mo:0.1% -1.0%, and the balance of Fe and unavoidable impurities.
Example 1
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:0.5%, mo:0.5%, cu:2.0%, al:4.0%, cr:17.0%, mn:7.0%, ni:0.5%, nb:1.0%, ti:0.5%, ce:0.1%, W:1.0% and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.0mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
Example 2
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:0.6%, mo:0.3%, cu:2.5%, al:5.0%, cr:18.0%, mn:8.0%, ni:0.6%, nb:2.0%, ti:1.0%, ce:0.05%, W:1.5 percent and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.2mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
Example 3
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:0.7%, mo:0.3%, cu:3%, al:6.0%, cr:17.0%, mn:8.0%, ni:0.7%, nb:1.0%, ti:0.5%, ce:0.05%, W:1.0% and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.2mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
Example 4
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:0.8%, mo:0.5%, cu:2.0%, al:4.0%, cr:18.0%, mn:8.0%, ni:0.8%, nb:1.2%, ti:0.6%, ce:0.1%, W:1.5 percent, and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.0mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
Example 5
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:0.9%, mo:0.3%, cu:2.5%, al:5.0%, cr:18.0%, mn:7.0%, ni:0.9%, nb:1.0%, ti:0.5%, ce:0.05%, W:0.5 percent, and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.0mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
Example 6
The embodiment provides a high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system, which comprises the following flux-cored components in percentage by mass: c:0.05%, si:1.0%, mo:0.5%, cu:2.0%, al:4.0%, cr:18.0%, mn:8.0%, ni:1.0%, nb:1.0%, ti:0.5%, ce:0.1%, W:0.5 percent, and the balance of iron powder.
The flux-cored wire is prepared by the following steps: weighing the components according to the proportion, uniformly mixing, and drying in a drying furnace at 300 ℃ for 1h to obtain flux-cored powder; and (3) placing the low-carbon steel strip on a strip placing machine of a welding wire forming machine, rolling the low-carbon steel strip into a U-shaped groove through a pressing groove of the forming machine, enabling the filling rate to be 20%, rolling and closing the U-shaped groove by the forming machine, drawing until the diameter is 1.0mm, and finally removing greasy dirt and moisture on the surface of the welding wire by using a degreasing machine and a dryer.
The flux-cored wires prepared in examples 1-6 were selected for welding experiments with conventional flux-cored wires for welding 439-type ferritic stainless steel on the market (comparative example 1 and comparative example 2): argon tungsten-arc welding is adopted, and the protective gas is 98 percent Ar+2 percent O 2 Direct current positive connection is adopted, the diameter of a tungsten electrode is 2mm, and the taper of the head is 20 degrees. Mechanical property detection is carried out on the welded seam after welding, wherein the mechanical property detection comprises the most main oxidation kinetics analysis, and the 8 samples are respectively placed in air at 800 DEG CIn the environment, the oxidation rates of the weld metal are calculated by plotting oxidation weight gain curves, and the high-temperature oxidation resistance of the weld metal is judged according to the oxidation rate, and the mechanical properties of the weld metal are shown in tables 1 and 2.
Table 1: mechanical properties of weld metal at room temperature (25 ℃ C.)
Table 2: mechanical properties of weld metal at 800 DEG C
As can be seen from tables 1 and 2, each of the mechanical properties of examples 1 to 6 and the oxidation rate at high temperature (800 ℃ C.) was superior to those of comparative examples 1 and 2, and the oxidation rate of the high temperature oxidation resistant flux-cored wire for welding of automobile exhaust systems at 800 ℃ was not more than 0.020mg/cm 2 H, the yield strength is more than or equal to 20MPa, the tensile strength is more than or equal to 34MPa, the elongation after breaking is more than or equal to 46%, the hardness is more than or equal to 240HV, the improvement of the welding mechanical property is remarkable, the arc is more stable, the welding spatter is small, the welding seam is attractive in appearance, the deposition speed is high, all-position welding can be performed, the welding seam metal has excellent high-temperature oxidation resistance, and relatively high joint toughness and corrosion resistance, and the high-temperature oxidation rate is reduced by nearly 90%.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the principle of the present invention, should make improvements and modifications without departing from the scope of the present invention.
Claims (10)
1. The high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system is characterized by comprising a sheath and a flux core;
the outer skin adopts a low-carbon steel belt;
the medicine core consists of the following components in percentage by mass: c:0.03% -0.07%, si:0.5% -1.0%, mo:0.1% -0.5%, cu:2.0% -3.0%, al:1.5% -6.0%, cr:16.0% -18.0%, mn:6.0% -8.0%, ni:0.5% -1.0%, nb:0.5% -2.0%, ti:0.5% -1.0%, ce:0.03% -0.1%, W:0.5% -1.5% and the balance of iron powder.
2. The high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system according to claim 1, wherein the width of a low-carbon steel strip adopted by the sheath is 10-12mm, the thickness is 0.4-0.8mm, and the low-carbon steel strip comprises the following components in percentage by mass: c:0.01% -0.1%, si:0.05% -0.2%, mn:0.1% -0.5%, P is less than or equal to 0.01%, S is less than or equal to 0.01%, N is less than or equal to 0.005%, nb:0.01% -0.20.2%, ti:0.005% -0.1%, mo:0.1% -1.0%, and the balance of Fe and unavoidable impurities.
3. The high temperature oxidation resistant 439Ti flux-cored wire for automotive exhaust system additive manufacturing of claim 1, wherein the flux-cored is controlled to 19% -23%.
4. The high temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of automobile exhaust systems according to claim 1, wherein the component particle size of the flux-cored wire is 80-200 mesh, cr, W are added in the form of metal, mn is added in the form of electrolytic manganese, ti is added in the form of ferrotitanium, C is added in the form of graphite, ce is added in the form of cerium oxide powder, and the contents of impurity elements S and P are both less than 0.03%.
5. The high temperature oxidation resistant 439Ti flux-cored wire for automotive exhaust system additive manufacturing of claim 1, wherein the flux-cored comprises the following components: when the content of W is 0.5% -1.5%, the content of Ce is 0.03% -0.1%, while satisfying W/ce=20: 1.
6. the high temperature oxidation resistant 439Ti flux-cored wire for automotive exhaust system additive manufacturing of claim 1, wherein the flux-cored comprises the following components: ti/nb=1: 2.
7. the high temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of automotive exhaust systems of claim 1, wherein the low carbon steel strip comprises the following components: ti/nb=1: 2.
8. the high temperature oxidation resistant 439Ti flux-cored wire for automotive exhaust system additive manufacturing of claim 1, wherein the flux-cored comprises the following components: cu/al=1: 2.
9. the method for preparing the high-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of an automobile exhaust system according to any one of claims 1 to 8, comprising the following steps:
step 1: weighing the components of the drug core according to any one of claims 1 to 8, uniformly mixing, and drying in a dryer at 250-300 ℃ for 1h to obtain drug core powder;
step 2: the method comprises the steps of placing a low-carbon steel belt on a belt placing machine of a welding wire forming machine, rolling the low-carbon steel belt into a U-shaped groove through a pressing groove of the forming machine, filling the flux-cored powder obtained in the step 1 into the U-shaped groove, rolling and closing the U-shaped groove through the forming machine, drawing until the diameter is 1.0-1.2mm, and removing greasy dirt and moisture on the surface of a welding wire through a degreasing machine and a dryer.
10. Use of a high temperature oxidation resistant 439Ti flux-cored wire for automotive exhaust system additive manufacturing according to any one of claims 1 to 8 in the welding of 439 ferritic stainless steel pipelines of automotive exhaust systems with a welding current of 90-120A, an arc voltage of 14-16V and a welding speed of 25-30cm/min.
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| CN202310587474.XA CN116551239A (en) | 2023-05-24 | 2023-05-24 | High-temperature oxidation resistant 439Ti flux-cored wire for additive manufacturing of automobile exhaust system and preparation method thereof |
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