CN115592297A - Flux-cored filling wire for manufacturing carbon steel-duplex stainless steel composite part by arc fuse wire additive manufacturing - Google Patents
Flux-cored filling wire for manufacturing carbon steel-duplex stainless steel composite part by arc fuse wire additive manufacturing Download PDFInfo
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- 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
-
- 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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Abstract
A flux-cored filling wire for manufacturing a carbon steel-duplex stainless steel composite part by using an arc fuse wire additive belongs to the technical field of arc fuse wire additive, and comprises metal powder and a sheath, wherein the metal powder is prepared from the following components in percentage by mass: 38-41% of metal Cr powder, 21-23% of metal Ni powder, 1-3.5% of MnFe alloy powder, 11-17.5% of MoFe alloy powder, 2.1-3.1% of metal Nb powder and the balance of metal Fe powder, wherein the outer skin is 2205 duplex stainless steel band, and the powder filling rate is 18-22%. The filling wire is suitable for preparing a carbon steel-duplex stainless steel composite part in an electric arc fuse wire additive mode, can be directly adopted for cladding a transition layer, and can control the ferrite-austenite ratio of the prepared carbon steel-stainless steel composite part to be 40-60% and has better mechanical property and corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of arc fuse additive manufacturing, and particularly relates to a flux-cored filling wire for manufacturing a carbon steel-duplex stainless steel composite part by arc fuse additive manufacturing.
Background
The carbon steel-duplex stainless steel composite material has the excellent corrosion resistance of duplex stainless steel and the advantage of low cost of carbon steel, and compared with the duplex stainless steel with the same specification, the carbon steel-duplex stainless steel composite material can save 70-80% of elements of chromium and nickel and reduce the production cost by 40-50%, so the carbon steel-duplex stainless steel composite material is widely applied to the fields of petrochemical engineering, ocean engineering, agricultural machinery cutters and the like. The conventional production method mainly comprises the methods of explosion welding, rolling, casting and the like, but the explosion welding is only suitable for preparing the thick plate composite material, and the rolling and the casting respectively have the problems of complex process, low composite strength, more defects and the like. The electric arc fuse wire additive manufacturing technology directly manufactures a compact metal solid component in a layer-by-layer deposition mode, a liquid molten pool is formed between a base layer and a multiple layer, sufficient metallurgical bonding is achieved, and the composite strength is high; can realize the direct molding of complex components, is a production method of a composite part with low cost, high efficiency and high quality, and has important application prospect in the manufacturing of carbon steel-duplex stainless steel composite materials.
However, the existing commercial duplex stainless steel filler wires are designed for welding, and the filler wires specially used for the additive manufacturing of the arc fuse are lacked. Compared to soldering, the arc fuse additive manufacturing process goes through many complex thermal cycles and there is a severe heat buildup as the number of deposited layers increases. The existing commercial duplex stainless steel welding wire is adopted to carry out electric arc additive manufacturing to prepare the carbon steel-duplex stainless steel composite part, on one hand, as the retention time of the duplex stainless steel side in a high-temperature area is longer, a large amount of ferrite is transformed into austenite, so that two phases of ferrite and austenite in the additive part are unbalanced, and the ferrite phase proportion is too low. On the other hand, in the compounding process of the carbon steel and the stainless steel, a large amount of iron elements in the carbon steel enter a molten pool, and alloy elements such as Cr, ni and the like in the stainless steel filling wire are diluted, so that the actual alloy components of a transition interface are lower than the expected cladding components of the stainless steel filling wire, and the mechanical property and the corrosion resistance are reduced. The study of Yiqi Zhang et al found that the duplex stainless steel arc additive prepared by using the commercial ER2209 welding wire has the austenite content as high as 74% and the mechanical property and the corrosion resistance are reduced. Stutzer et al used an auxiliary cold wire to add material to a duplex stainless steel arc fuse to achieve the goals of reducing heat input and adjusting the content of alloying elements, but this method requires 2 independent wire feeding and monitoring control systems, the equipment is cumbersome, and the process complexity is increased.
In summary, the existing commercial welding wire is not suitable for manufacturing carbon steel-stainless steel composite parts by arc additive manufacturing, and a special filling wire for manufacturing carbon steel-duplex stainless steel composite parts by arc fuse additive manufacturing is needed to be designed, so that two-phase balance of ferrite and austenite on the sides of duplex stainless steel in an additive component and alloy element compensation of a carbon steel-duplex stainless steel transition interface are realized, and the special filling wire has important significance for improving comprehensive mechanical properties of the carbon steel-duplex stainless steel composite parts and promoting application of arc fuse additive manufacturing process.
Disclosure of Invention
Aiming at the defects of the existing duplex stainless steel welding wire, the invention provides the flux-cored filling wire suitable for the electric arc fuse additive manufacturing of the carbon steel-duplex stainless steel composite part, and aims to solve the problem of performance reduction caused by unbalance of two phases of ferrite and austenite of a duplex stainless steel layer and dilution of alloy elements such as Cr, ni and the like in an interface transition region in the electric arc additive manufacturing carbon steel-duplex stainless steel composite part. The above problems are related to the thermal cycling characteristics of the arc fuse additive manufacturing process and the Cr equivalent and Ni equivalent in the filler wire material, wherein the Cr equivalent element is a ferrite promoting element and the Ni equivalent element is an austenite promoting element. According to the thermal cycle characteristics of the arc fuse additive manufacturing process and the calculation result of a WRC-1992 phase diagram, the invention designs a flux-cored filling wire material containing elements with higher Cr equivalent and lower Ni equivalent, so that the ferrite content of a stainless steel layer of an arc additive composite part can be controlled within a range of 40-60%, the ferrite and the austenite are approximately balanced, the pitting corrosion index PREN can be ensured, the contents of alloy elements such as Cr and Ni in an interface transition region can be improved, and the mechanical property and the corrosion resistance of the composite part can be greatly improved. On the other hand, due to the special design of the Cr, ni, si and other element content of the wire, a special filling wire for a transition layer in the traditional process is not needed, the filling wire can be directly adopted for cladding the transition layer and the stainless steel layer, the surface tension of molten pool liquid metal is small, and the forming quality and the forming precision are good.
The invention is realized by the following technical scheme:
the invention provides a flux-cored filling wire suitable for preparing a stainless steel cladding layer of a carbon steel-duplex stainless steel composite part by an arc fuse additive, which consists of metal powder and a sheath, wherein the sheath adopts a 2205 duplex stainless steel band, and the chemical components of the flux-cored filling wire are as follows by mass percent: 21 to 24 percent of Cr, 4.5 to 6.5 percent of Ni, 1 to 2 percent of Mn, 2.5 to 3.5 percent of Mo, 0.01 to 0.03 percent of C, 0.08 to 0.2 percent of N, 0 to 1 percent of Si and the balance of Fe. The metal powder is prepared from the following components in percentage by mass: 38-41% of metal Cr powder, 21-23% of metal Ni powder, 1-3.5% of MnFe alloy powder, 11-17.5% of MoFe alloy powder, 2.1-3.1% of metal Nb powder and the balance of metal Fe powder.
Furthermore, the medicine powder filling rate of the medicine core filling silk is 18% -22%, and the diameter is 0.8-1.0mm.
Further, the mass fraction of Mn element in the MnFe alloy powder is 80%, and the balance is iron; the MoFe alloy powder comprises 60% of Mo element by mass and the balance of iron.
A flux-cored filling wire suitable for preparing a stainless steel cladding layer of a carbon steel-duplex stainless steel composite part by arc fuse wire additive manufacturing comprises the following processes: the heat source mode is cold metal transition arc, the additive current is 120-160A, the arc voltage is 17-19V, the additive speed is 4-6mm/s, the interlayer temperature is less than or equal to 160 ℃, and in order to increase the arc stability and the liquid metal wettability, a small amount of CO is added into Ar protective gas during the additive carbon steel layer 2 The gas, i.e. the shielding gas, is Ar95% + CO 2 And 5% of mixed gas, and pure Ar gas is adopted for protection in order to avoid introducing excessive C elements and burning alloy elements when the additive transition layer and the stainless steel layer are added.
Furthermore, the carbon steel cladding layer of the carbon steel-duplex stainless steel composite part prepared by the filling wire and the process adopts ER50-6 solid welding wire with the diameter of 1.0mm, and the transition layer and the stainless steel layer adopt the filling wire.
Further, the carbon steel-duplex stainless steel composite part prepared by the filling wire and the process has the following elements: 23.9 to 25.2 percent of Cr, 7.8 to 8.8 percent of Ni, 1.1 to 1.68 percent of Mn1, 3.1 to 3.7 percent of Mo, 0.33 to 0.54 percent of Nb, 0.015 to 0.028 percent of C, 0.2 to 0.3 percent of N, 0.3 to 0.6 percent of Si and the balance of Fe. Compared with 2209 duplex stainless steel, the component improves the Cr content and reduces the Ni content, on one hand, the ferrite content can be improved, on the other hand, the corrosion resistance of the stainless steel is improved due to the high Cr content, and the production cost is reduced due to the low Ni content. The addition of Nb element can form stable NbN and NbC compounds, and plays the roles of grain refinement and second phase precipitation strengthening.
Furthermore, the filler wire can be used as a filler material of the stainless steel side of the composite part, and has a higher Cr/Ni equivalent ratio due to the adoption of special alloy component design, so that the austenite content is reduced, the martensite transformation temperature is reduced, the austenite stability is improved, the formation of tissues such as martensite and the like can be avoided under a proper process, and the filler wire can also be directly adopted for cladding a transition layer.
Furthermore, the Si content in the filler wire cladding metal is 0.3-0.6%, the surface tension of molten pool liquid metal can be reduced, the additive size precision is improved, and the forming quality of the arc fuse additive composite part is improved.
The invention has the beneficial effects that:
(1) Compared with a commercial duplex stainless steel welding wire, the flux-cored filler wire provided by the invention has the advantages of higher Cr equivalent and lower Ni equivalent, is suitable for the process characteristics of serious heat accumulation and low heat dissipation speed in electric arc additive manufacturing, the ferrite content of a duplex stainless steel layer in a prepared carbon steel-duplex stainless steel composite member is about 50%, the two phases of austenite and ferrite are approximately balanced, the problem of dilution of alloy elements in a transition area of an interface of carbon steel and duplex stainless steel is solved, and the mechanical property and the corrosion resistance of the composite member are greatly improved.
(2) The flux-cored filling wire provided by the invention is suitable for preparing a carbon steel-stainless steel composite part in an arc fuse material increase mode, and has higher manufacturing efficiency and composite strength compared with the traditional preparation mode. The additive material has proper Si content, can reduce the surface tension of liquid metal in a molten pool, and improves the dimensional precision and the forming quality of the additive material.
(3) Because the wire material has higher Cr/Ni equivalent ratio in the components, the austenite content is reduced, the martensite transformation temperature is also reduced, and the austenite stability is improved, so that the formation of tissues such as martensite and the like can be avoided under a proper process, and the filling wire can be directly adopted for cladding the transition layer without the filling wire of the transition layer in the traditional process.
Drawings
FIG. 1 is a schematic view of an arc additive manufacturing method 1 of a carbon steel-duplex stainless steel composite part
Fig. 2 is a schematic view of an electric arc additive manufacturing method 2 of the carbon steel-duplex stainless steel composite part.
Detailed Description
The technical solution of the present invention is described in detail with reference to the specific examples below.
Example 1
The flux-cored filling wire suitable for the additive manufacturing of the carbon steel-duplex stainless steel composite part of the arc fuse wire comprises metal powder and a sheath, wherein the filling rate of the metal powder is 20%.
The outer skin adopts 2205 double-phase stainless steel bands, the size of the steel band is 0.4mm 10mm, and the outer skin comprises the following chemical components in percentage by mass: 22.25% of Cr, 5.3% of Ni, 1.58% of Mn, 3.25% of Mo, 0.016% of C, 0.16% of N, 0.51% of Si and the balance of Fe.
The metal powder comprises the following components in percentage by mass: 39% of metal Cr powder, 21% of metal Ni powder, 1% of MnFe alloy powder, 11% of MoFe alloy powder, 2.5% of metal Nb powder and the balance of metal Fe powder.
The manufacturing steps of the filling wire of the embodiment are as follows:
(1) Mixing the above powders at a certain proportion, and oven drying at 150 deg.C for 1h.
(2) And (2) rolling the 2205 duplex stainless steel band into a U-shaped groove, and adding the medicinal powder in the step (1) into the U-shaped groove according to the filling rate of 20%.
(3) The U-shaped stainless steel band added with the medicinal powder is pressed into a closed tubular wire wrapping the powder through a roller, and then the diameter of the wire is reduced through drawing for a plurality of times to reach 1.0mm.
(4) And (4) cleaning, coiling and packaging the flux-cored filling wire obtained in the step (3) to obtain the flux-cored filling wire of the embodiment.
The process flow for manufacturing the carbon steel-duplex stainless steel composite part by the arc fuse additive manufacturing comprises the following steps:
(1) And cladding 8 layers of Q345 steel with the thickness of 10mm serving as a substrate on the substrate by using 1.0mm ER50-6 carbon steel wires according to the structure shown in the figure 1 to obtain a carbon steel layer part of the composite part. The additive process is shown in table 1.
(2) Cladding 1 layer of the flux-cored filling wire obtained in the step (1) on the carbon steel layer member obtained in the step (1) according to the structure shown in the figure 1 to obtain a composite transition layer. The additive process is shown in table 1.
(3) And (3) cladding 15 layers on the composite member obtained in the step (2) by using the flux-cored filling wire of the embodiment according to the structure shown in figure 1 to obtain a duplex stainless steel cladding layer of the composite member. The additive process is shown in table 1.
Chemical components of the additive transition layer and the stainless steel layer are detected by a chemical analysis method, and the results are shown in table 2. The pitting resistance coefficient of the stainless steel layer of the composite of this embodiment can be calculated according to the chemical composition and the pitting resistance formula PREN = Cr +3.3 (Mo + 0.5W) +16N for stainless steel, as shown in table 3. The ferrite content of the stainless steel cladding layer of the additive material piece was measured by using an FMP30 ferrite content tester, and the results are shown in Table 3. The average corrosion rate of the stainless steel layer of the additive material in the chloride environment was determined according to the standard GB/T17897-2016 stainless steel ferric chloride spot corrosion test method, and the results are shown in Table 3. The tensile strength of the stainless steel layer of the reinforced part is determined according to the standard GB/T228.1-2010 metal material tensile test-room temperature test method, and the result is shown in Table 3. The test result shows that the additive part has excellent corrosion resistance and mechanical property. Selecting 5 longitudinal sections of the additive part at intervals, measuring the weld bead fusion width of each layer, taking the average value of 5 values as the wall thickness of each layer, and calculating the average wall thickness of three parts according to the number of layers of the carbon steel area, the transition area and the stainless steel area and the wall thickness of each layer; the average height of the three sections was taken as the average height of 3 zones of 5 longitudinal sections, the results of which are shown in table 3. According to the result, the prepared additive part has the advantages of uniform wall thickness, small surface roughness, high forming precision, no obvious defect in appearance and good forming quality.
Example 2
The flux-cored filling wire suitable for the additive manufacturing of the carbon steel-duplex stainless steel composite part of the arc fuse wire comprises metal powder and a sheath, wherein the filling rate of the metal powder is 20%.
The outer skin adopts 2205 double-phase stainless steel bands, the size of the steel band is 0.4mm/10mm, and the steel band comprises the following chemical components in percentage by mass: 22.25% of Cr, 5.3% of Ni, 1.58% of Mn, 3.25% of Mo, 0.016% of C, 0.16% of N, 0.51% of Si and the balance of Fe.
The metal powder comprises the following components in percentage by mass: 41% of metal Cr powder, 23% of metal Ni powder, 3% of MnFe alloy powder, 15% of MoFe alloy powder, 2.5% of metal Nb powder and the balance of metal Fe powder.
The manufacturing steps of the filling wire of the embodiment are as follows:
(1) Mixing the above powders at a certain proportion, and oven drying at 150 deg.C for 1h.
(2) And (2) rolling the 2205 duplex stainless steel band into a U-shaped groove, and adding the medicinal powder in the step (1) into the U-shaped groove according to the filling rate of 20%.
(3) The U-shaped stainless steel strip added with the medicinal powder is pressed into a closed tubular wire material wrapping the powder through a roller, and then the diameter of the wire material is reduced through drawing for a plurality of times, so that the diameter of the wire material reaches 1.0mm.
(4) And (4) cleaning, coiling and packaging the flux core filling wire obtained in the step (3) to obtain the flux core filling wire of the embodiment.
The process flow of the carbon steel-duplex stainless steel composite part manufactured by the arc fuse additive manufacturing method is the same as that of the example 1, and specific additive process parameters are shown in the table 1.
The chemical compositions of the transition layer and the stainless steel layer of the additive part of the embodiment are shown in a table 2, and the test methods and standards of the ferrite content, the pitting corrosion resistance coefficient, the corrosion resistance, the mechanical property and the molding quality are the same as those of the embodiment 1, and the results are shown in a table 3.
Example 3
The flux-cored filling wire suitable for the additive manufacturing of the carbon steel-duplex stainless steel composite part by the arc fuse wire comprises metal powder and a sheath, wherein the filling rate of the metal powder is 22%.
The outer skin adopts 2205 double-phase stainless steel bands, the size of the steel band is 0.4mm 10mm, and the outer skin comprises the following chemical components in percentage by mass: 22.25% of Cr, 5.3% of Ni, 1.58% of Mn, 3.25% of Mo, 0.016% of C, 0.16% of N, 0.51% of Si and the balance of Fe.
The metal powder comprises the following components in percentage by mass: 38% of metal Cr powder, 21% of metal Ni powder, 2.3% of MnFe alloy powder, 13% of MoFe alloy powder, 2.5% of metal Nb powder and the balance of metal Fe powder.
The manufacturing steps of the filling wire of the embodiment are as follows:
(1) Mixing the above powders at a certain proportion, and oven drying at 150 deg.C for 1h.
(2) Rolling the 2205 duplex stainless steel strip into a U-shaped groove, and adding the medicinal powder in the step (1) into the U-shaped groove according to the filling rate of 20%.
(3) The U-shaped stainless steel band added with the medicinal powder is pressed into a closed tubular wire wrapping the powder through a roller, and then the diameter of the wire is reduced through drawing for a plurality of times to reach 1.0mm.
(4) And (4) cleaning, coiling and packaging the flux-cored filling wire obtained in the step (3) to obtain the flux-cored filling wire of the embodiment.
The process flow of the carbon steel-duplex stainless steel composite part manufactured by the arc fuse additive manufacturing method is the same as that of the example 1, and specific additive process parameters are shown in the table 1.
The chemical compositions of the transition layer and the stainless steel layer of the additive part of the embodiment are shown in table 2, the test methods and standards of the ferrite content, the pitting corrosion resistance coefficient, the corrosion resistance, the mechanical property and the molding quality are the same as those of the embodiment 1, and the results are shown in table 3.
Example 4
The components, contents and manufacturing steps of the filling yarn in the embodiment are the same as those in the embodiment 1, except that:
the process flow for manufacturing the carbon steel-duplex stainless steel composite part by the arc fuse additive manufacturing comprises the following steps:
(1) Q345 steel with the thickness of 10mm is taken as a substrate, and an ER50-6 carbon steel wire with the thickness of 1.0mm is used for cladding 1 layer on the substrate according to the structure shown in figure 2. The additive process is shown in table 1.
(2) And (3) cladding 1 layer of carbon steel cladding layer obtained in the step (1) by adopting the flux-cored filling wire according to the structure shown in figure 2, wherein the distance between two layers is 6.2mm. The additive process is shown in table 2.
(3) And (3) repeating the steps (1) and (2) upwards layer by layer as shown in figure 2, and alternately adding the carbon steel and the duplex stainless steel to obtain the longitudinal double-layer carbon steel-duplex stainless steel composite part.
The chemical components of the stainless steel layer of the additive member of the example are shown in table 2, and the test methods and standards of the ferrite content, the pitting corrosion resistance coefficient, the corrosion resistance, the mechanical property and the molding quality are the same as those of the example 1, and the results are shown in table 3.
Comparative example 1
A commercial ER2209 welding wire is used as a comparative example to prepare the carbon steel-duplex stainless steel additive composite part, and the preparation process flow is as follows:
(1) And cladding 8 layers of Q345 steel with the thickness of 10mm serving as a substrate on the substrate by using 1.0mm ER50-6 carbon steel wires according to the structure shown in the figure 1 to obtain a carbon steel layer part of the composite part. The additive process is shown in table 1.
(2) Cladding 1 layer on the carbon steel layer component obtained in the step (1) by using ER2209 welding wires according to the structure shown in figure 1 to obtain the transition layer of the composite part. The additive process is shown in table 1.
(3) And (3) cladding 15 layers on the composite member obtained in the step (2) by adopting an ER2209 welding wire according to the structure shown in figure 1 to obtain a duplex stainless steel cladding of the composite member. The additive process is shown in table 1.
The chemical compositions of the transition layer and the stainless steel layer of the comparative additive part are shown in Table 2, and the test methods and standards of the ferrite content, the pitting corrosion resistance coefficient, the corrosion resistance, the mechanical property and the molding quality are the same as those of the example 1, and the results are shown in Table 3.
Comparative example 2
A commercial ER2209 welding wire is adopted as a comparative example to prepare the carbon steel-duplex stainless steel additive composite part, and the preparation process flow is as follows:
(1) Q345 steel with the thickness of 10mm is used as a substrate, and 1 layer of ER50-6 carbon steel wire with the thickness of 1.0mm is clad on the substrate according to the formula shown in figure 2. The additive process is shown in table 1.
(2) And (3) cladding 1 layer of the carbon steel cladding layer obtained in the step (1) by adopting an ER2209 welding wire according to the structure shown in figure 2, wherein the distance between two layers is 6.2mm. The additive process is shown in table 1.
(3) And (3) repeating the steps (1) and (2) upwards layer by layer as shown in figure 2, and alternately adding the carbon steel and the duplex stainless steel to obtain the longitudinal double-layer carbon steel-duplex stainless steel composite part.
The chemical components of the stainless steel layer of the additive material of the comparative example are shown in table 2, the test methods and standards of the ferrite content, the pitting corrosion resistance coefficient, the corrosion resistance, the mechanical property and the molding quality are the same as those of example 1, and the results are shown in table 3.
It can be seen from the comparison of tables 2 and 3 that the proportion of ferrite phase and austenite phase of the stainless steel layer of the carbon steel-duplex stainless steel composite part prepared by adopting the filling wire of the invention is more balanced and the corrosion resistance is better than that of the carbon steel-duplex stainless steel composite part prepared by arc fuse additive manufacturing by using ER2209 commercial stainless steel welding wire, and the filling wire has better mechanical property and more stable dimensional accuracy and quality of additive part molding.
TABLE 1 additive Process parameters for each example and comparative example
TABLE 2 chemical composition contents of transition layer and stainless steel layer of each example and comparative example composite
TABLE 3 Properties of the stainless steel layers of the composites of the examples and comparative examples
Claims (9)
1. The flux-cored filling wire suitable for preparing the stainless steel cladding layer of the carbon steel-duplex stainless steel composite part by the aid of electric arc fuse wire additive materials is characterized by comprising metal powder and a sheath, wherein the sheath is a 2205 duplex stainless steel strip and comprises the following chemical components in percentage by mass: 21-24% of Cr, 4.5-6.5% of Ni, 1-2% of Mn, 2.5-3.5% of Mo, 0.01-0.03% of C, 0.08-0.2% of N, 0-1% of Si and the balance of Fe. The metal powder is prepared from the following components in percentage by mass: 38-41% of metal Cr powder, 21-23% of metal Ni powder, 1-3.5% of MnFe alloy powder, 11-17.5% of MoFe alloy powder, 2.1-3.1% of metal Nb powder and the balance of metal Fe powder.
2. The flux-cored filling wire suitable for the additive manufacturing of a stainless steel cladding layer of a carbon steel-duplex stainless steel composite part by an arc fuse according to claim 1, wherein the flux-cored filling wire has a powder filling rate of 18-22% and a diameter of 0.8-1.0mm.
3. The flux-cored filler wire suitable for the additive manufacturing of a stainless steel cladding layer of a carbon steel-duplex stainless steel composite part by an arc fuse according to claim 1, wherein the mass fraction of Mn element in the MnFe alloy powder is 80%, and the balance is Fe; the MoFe alloy powder comprises 60% of Mo element by mass and the balance of iron.
4. The process for preparing a carbon steel-duplex stainless steel composite part by using the flux-cored filler wire as claimed in any one of claims 1 to 3, wherein the heat source mode is a cold metal transition arc, the additive current is 120 to 160A, the arc voltage is 17 to 19V, the additive speed is 4 to 6mm/s, the interlayer temperature is less than or equal to 160 ℃, and a small amount of CO is added into Ar protective gas during the additive carbon steel layer so as to increase the arc stability and the liquid metal wettability 2 The gas, i.e. the shielding gas, is Ar95% + CO 2 And 5% of mixed gas, and pure Ar gas is adopted for protection in order to avoid introducing excessive C elements and burning alloy elements when the additive transition layer and the stainless steel layer are added.
5. The process as claimed in claim 4, wherein said carbon steel-duplex stainless steel composite has 2 forms, one consisting of a carbon steel layer, a transition layer and a stainless steel layer, and the other consisting of a carbon steel layer and a stainless steel layer.
6. The process as claimed in claim 4, wherein the filler wire and the carbon steel-duplex stainless steel composite member prepared by the process have a carbon steel cladding layer made of ER50-6 solid wire with a diameter of 1.0mm, and the filler wire is used for the transition layer and the stainless steel layer.
7. The process of claim 4, wherein the carbon steel-duplex stainless steel composite has a stainless steel layer comprising the following elements: 23.9 to 25.2 percent of Cr, 7.8 to 8.8 percent of Ni, 1.1 to 1.68 percent of Mn1, 3.1 to 3.7 percent of Mo, 0.33 to 0.54 percent of Nb, 0.015 to 0.028 percent of C, 0.2 to 0.3 percent of N, 0.3 to 0.6 percent of Si and the balance of Fe.
8. A process according to claim 4, characterized in that the duplex stainless steel cladding contains 60% to 40% austenite phase and the balance ferrite phase.
9. The process as claimed in claim 4, wherein the Si content in the filler wire clad metal is 0.3-0.6%, which can reduce the surface tension of molten pool liquid metal, improve the additive dimensional accuracy and improve the forming quality of the arc fuse additive composite part.
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| US20020148533A1 (en) * | 2000-07-28 | 2002-10-17 | Kim Jong-Won | Flux cored wire for dual phase stainless steel |
| JP2005279768A (en) * | 2004-03-30 | 2005-10-13 | National Institute For Materials Science | Flux cored wire for welding and weld joint for steel structure |
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