CN114871623B - Graphene-containing high-crack-resistance high-manganese steel flux-cored wire and application thereof - Google Patents

Graphene-containing high-crack-resistance high-manganese steel flux-cored wire and application thereof Download PDF

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CN114871623B
CN114871623B CN202210643269.6A CN202210643269A CN114871623B CN 114871623 B CN114871623 B CN 114871623B CN 202210643269 A CN202210643269 A CN 202210643269A CN 114871623 B CN114871623 B CN 114871623B
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graphene
flux
cored wire
crack
manganese steel
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CN114871623A (en
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张天理
彭净净
杨凯钦
马建国
邓浩祥
栗卓新
徐锴
李振华
方乃文
陈振刚
武雯
陈浩欣
葛丽
葛坤
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Shanghai University of Engineering Science
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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
    • B23K35/02—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
    • B23K35/02—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
    • B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
    • 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
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • 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
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
    • 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
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • 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
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • 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

Abstract

The invention discloses a high-crack-resistance high-manganese steel flux-cored wire containing graphene and application thereof, wherein a low-carbon steel strip coated with a graphene coating is taken as a sheath, and a flux core comprises the following components in percentage by mass: 0.2-0.8% of C, 0.1-0.8% of Si, 17-32% of Mn, 1.5-6.5% of Cr, 1.8-5.5% of Ni, 0.5-2.8% of Cu, 1.5-3.5% of Mo, 0.2-0.8% of Ti, 0.01-0.09% of RE, 0.10-0.95% of graphene and the balance of atomized iron powder and inevitable impurities. The content of diffusible hydrogen in the flux-cored wire is not more than 1.5mL/100g, the strength and toughness of the flux-cored wire are improved while the crack resistance of weld metal is greatly improved, the welding process performance and the weld quality are good, and the flux-cored wire can be used for manufacturing parts of buildings, shipbuilding, railways, automobiles, aviation and aerospace and the like by electric arc additive manufacturing.

Description

Graphene-containing high-crack-resistance high-manganese-steel flux-cored wire and application thereof
Technical Field
The invention belongs to the field of additive manufacturing materials, and particularly relates to a graphene-containing high-crack-resistance high-manganese steel flux-cored wire and application thereof.
Background
With the continuous development of science and technology, the flux-cored wire is one of the most potential welding materials for development in continuous improvement of performance and wide application, but at the same time, the flux-cored wire has many defects, such as easy oxidation of the flux-cored wire in air, poor toughness of welding seams, more air holes, large crystal grains caused by overheating, poor stability of electric arcs and the like.
The high manganese steel is easy to generate cracks in the welding process, wherein the main induction factor is certain constituent elements in the high manganese steel, sulfur and phosphorus eutectic compounds are easy to generate in the welding process, the melting point of the eutectic compounds is lower than that of the high manganese steel, so that the cracks are generated, the reduction of the formation of the eutectic compounds is an important means for preventing the cracks, the cracks are generated by the factors such as the restraint stress, the content of diffused hydrogen, chemical components and the like of a welding joint, and the structure with the best crack resistance of weld metal can be obtained by controlling the chemical components in a welding rod. In addition, the influence of the thermal expansion coefficient of the high manganese steel in the welding process is large, the welding process needs to be strictly controlled, the post-welding shrinkage rate of the high manganese steel is reduced, and changing the content of alloy elements in weld metal is one of important means for changing the toughness of the weld of the high strength steel. In the welding process of the high manganese steel, the influence of the crack sensitivity and the thermal expansion coefficient of the weld metal is not solved well, and a high manganese steel welding wire matched with the high manganese steel welding wire which can effectively reduce the crack sensitivity of the weld metal and greatly improve the toughness of the weld metal is not developed at present.
Disclosure of Invention
In view of the above problems in the prior art, the main object of the present invention is to provide a graphene-containing flux-cored wire for high manganese steel with high crack resistance, which has high elastic modulus, high strength and high thermal conductivity by adding graphene to refine crystal grains, promoting the formation of acicular ferrite and improving the toughness of a weld joint, and simultaneously, by using appropriate graphene, the strength and ductility of a material can be improved.
The invention also aims to provide application of the graphene-containing high-crack-resistance high-manganese steel flux-cored wire in electric arc additive manufacturing of building, shipbuilding, railway, automobile, aviation and aerospace parts.
In order to realize the purpose, the invention adopts the following technical scheme:
the high-crack-resistance high-manganese steel flux-cored wire containing graphene comprises a sheath and a flux core, wherein the sheath is a low-carbon steel strip coated with a graphene coating, and the flux core comprises the following components in percentage by mass: 0.2 to 0.8 percent of C, 0.1 to 0.8 percent of Si, 17 to 32 percent of Mn, 1.5 to 6.5 percent of Cr, 1.8 to 5.5 percent of Ni, 0.5 to 2.8 percent of Cu, 1.5 to 3.5 percent of Mo, 0.2 to 0.8 percent of Ti, 0.01 to 0.09 percent of RE, 0.10 to 0.95 percent of graphene, and the balance of atomized iron powder and inevitable impurities, wherein RE is formed by compounding one or more of La, ce and Pr.
Preferably, the width of the low-carbon steel strip in the outer skin is 10-14mm, the thickness of the low-carbon steel strip in the outer skin is 0.6-1.0mm, and the low-carbon steel strip in the outer skin comprises the following components in percentage by mass: 0.12-0.18% of graphene powder, 0.2-0.4% of Mn, 0.02-0.06% of P, 0.02-0.05% of Si, 0.01-0.03% of N, 1-6% of graphene and the balance of Fe, and the graphene coating is formed by spraying the graphene coating on the surface of the low-carbon steel strip, wherein the graphene coating is prepared from the following components in percentage by mass: 0.7:8, mixing the components; more preferably, the spray coating is ultrasonic spray coating.
Preferably, the particle size of each component in the drug core is 60-80 meshes.
Preferably, in the high manganese steel flux-cored wire, the raw material of Mn is low-carbon ferromanganese, and the raw material of Si is #75 ferrosilicon.
Preferably, RE in the medicine core is compounded by one or more of La, ce and Pr, and when RE is compounded by La, ce and Pr, the element content meets La: ce =1 and Pr < La.
Preferably, the graphene has a particle size of 4.00-6.00 μm and is prepared by a chemical vapor deposition method.
Preferably, the filling rate of the medicine core is 15-27%, and the loose packed density is 2.27-2.92g/cm 3 。
Preferably, in the high manganese steel flux-cored wire, the impurity element content of the flux core meets the conditions that S is less than 0.003 percent and P is less than 0.003 percent.
Preferably, in the high manganese steel flux-cored wire, the element content of the flux core meets the condition that Cu is less than or equal to 0.5Ni.
Preferably, the diameter of the high manganese steel flux-cored wire is 0.8-2.4mm.
The graphene-containing high-crack-resistance high-manganese steel flux-cored wire has the advantages that the incidence rate of cracks is reduced through the graphene, the welding requirement of high-manganese steel is met, the cracks generated in the welding process can be effectively reduced, the incidence rate of pores is reduced by reducing the formation of sulfur-phosphorus eutectic substances, the precipitation of carbides is reduced, and the formation of acicular ferrite is promoted, so that the crack resistance of weld metal is greatly improved, the strength and the toughness are improved, the welding process performance is good, the electric arc is stable, the weld quality is good, the weld formation is more uniform, the welding efficiency is high, the content of diffusible hydrogen is not more than 1.5mL/100g, and the high-crack-resistance high-manganese steel flux-cored wire has extremely high crack resistance, and the design thought is as follows: the addition of a certain amount of C element can ensure the strength of a welding seam, si and Mn can perform deoxidation and weld seam strength improvement in the high manganese steel welding process, the addition of Ni can improve the impact toughness of the welding seam and reduce the ductile-brittle transition temperature of the welding seam, the addition of a certain amount of Cr and Mo can ensure that the welding seam metal has higher strength and hardness, the addition of Ti can perform deoxidation and increase the formation of acicular ferrite in a microstructure at the same time of performing the deoxidation effect, the impact toughness of the welding seam metal is improved, the addition of graphene can perform deoxidation and dehydrogenation, refine crystal grains and reduce the tendency of crack sensitivity in the high manganese steel welding process, meanwhile, the escape frequency and the degree of a graphene deoxidation gas product are regulated and controlled by adding other composite deoxidation components, the stable escape of gas is promoted to take away heat, eutectic substances generated due to overhigh temperature are reduced, and the addition of graphene is favorable for improving the characteristics of a molten pool, so that the dilution rate is reduced and the material utilization rate is greatly improved. The components have the following functions:
c: form solid solution structure, raise the strength of steel, form carbide structure and raise the hardness and wear resistance of steel.
Si: the deoxidizer is a deoxidizer in the welding process, can prevent the generation of carbon monoxide air holes in the welding process, simultaneously plays a role in solid solution strengthening on a welding seam, improves the strength and hardness of welding seam metal, and silicon is #75 ferrosilicon, and high-silicon ferrosilicon plays a role in reducing agents. The ferrosilicon is added as an inoculant of the nodular cast iron, and can prevent the formation of carbides, promote the precipitation and spheroidization of graphite and improve the performance.
Mn: the low-carbon ferromanganese is selected to play the roles of a deoxidizer and a desulfurizer, the tendency of crack generation of weld metal in the welding process is reduced, crystal grains are refined, the formation of proeutectoid ferrite is inhibited, the formation of acicular ferrite is promoted, the strength of the weld metal is improved, and the performance of a welding joint can be ensured by matching Mn element with a proper amount of C element.
Ni: the stability of austenite is improved, the prior austenite crystal grains are refined, the formation of acicular ferrite can be promoted to improve the low-temperature impact toughness and the ductile-brittle transition temperature of the joint, elements such as Cr, mo and the like can be used when the Ni content is low, the mechanical property of the welded joint is met, and the manufacturing cost can be reduced.
Cr: solid solution strengthening occurs to strengthen the austenitic grain boundaries, but the content cannot be too high, which may degrade the formability of the joint.
Mo: the austenite transformation temperature of the weld metal is reduced, the formation of proeutectoid ferrite in the weld metal is inhibited, the transformation of bainite in the weld metal is promoted, and the strength and hardness of the weld metal are improved.
Ti: in the welding process, ti has strong affinity with O, the formed titanium oxide has higher melting point and can be used as a nucleation core of acicular ferrite, and the addition of trace Ti element can increase the formation of interlocked acicular ferrite in a microstructure and improve the impact toughness.
Cu: the strength and the corrosion resistance of the welding joint are improved, and a part of Fe is replaced.
RE: the method has the advantages that crystal grains are refined, the formation of acicular ferrite is promoted, cracks are reduced, the toughness of welding seams is improved, the dehydrogenation and deoxidation capacity of welding seam metal is improved, the generation of oxide inclusions is reduced, meanwhile, a gas product generated by graphene deoxidation overflows, so that part of heat is taken away, eutectic substances generated due to overhigh temperature are reduced, and the occurrence rate of cracks is reduced.
Graphene: the method has the advantages that crystal grains are refined, the formation of acicular ferrite is promoted, gas products are generated by deoxidation in the welding process, the stable escape of gas is promoted, the heat is taken away, the characteristics of a molten pool are favorably improved due to the addition of the graphene, the dilution rate is reduced, the material utilization rate is greatly improved, and the molten drop period can be prolonged due to the graphene.
The invention also provides application of the graphene-containing high-crack-resistance high-manganese steel flux-cored wire in electric arc additive manufacturing of parts of buildings, shipbuilding, railways, automobiles, aviation and aerospace.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the graphene refined crystal grains are added to promote the formation of acicular ferrite and improve the toughness of the welding line, meanwhile, the proper graphene can improve the strength and ductility of the material, so that the material has high elastic modulus, high strength and high thermal conductivity, a part of heat is taken away by a graphene deoxygenated gas product, the temperature of the welding line is reduced, the formation of eutectic substances is reduced, and the incidence rate of cracks is reduced.
2. According to the invention, a small amount of Ni is added to improve the stability of austenite, a part of Ni is replaced by Cr and Mo so as to reduce the cost of the material, the addition of Cu can replace a part of Fe, the strength and the corrosion resistance of the material can be improved, the combination of Mn and C can also ensure the stability of a welding joint, cr plays a role in solid solution strengthening, the austenite crystal boundary is strengthened, and the obtained graphene-containing high-crack-resistance high-manganese steel flux-cored wire has good comprehensive performance.
Detailed Description
In order to further clarify the object and technical means of the present invention, the present invention will be described in further detail with reference to examples below, but the scope of the present invention is not limited to the following examples.
Example 1
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.32%, si:0.75%, mn:18.7%, cr:1.7%, ni:2.5%, cu 0.8%, mo:1.6%, ti:0.33%, la:0.01 percent of graphene, 0.15 percent of atomized iron powder and inevitable impurities as the rest, drawing the welding wire to phi 1.2mm by a conventional preparation method, and ensuring that the filling rate of the flux core is 23 percent.
Example 2
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.44%, si:0.75%, mn:22.3%, cr:1.7%, ni:4.8%, cu 0.6%, mo:1.7%, ti:0.6%, ce:0.09 percent of graphene, 0.30 percent of graphene and the balance of atomized iron powder and inevitable impurities, wherein the welding wire is drawn to phi 1.6mm by a conventional preparation method, and the filling rate of the flux core is 23 percent.
Example 3
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.28%, si:0.4%, mn:24.6%, cr:2.5%, ni:3.2%, cu 0.5%, mo:1.7%, ti:0.25%, pr:0.02% of graphene, 0.45% of atomized iron powder and inevitable impurities as the rest, drawing the welding wire to phi 1.8mm by a conventional preparation method, and ensuring that the filling rate of the flux core is 22%.
Example 4
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.33%, si:0.5%, mn:25.0%, cr:3.2%, ni:4.2%, cu 0.6%, mo:1.8%, ti:0.55%, RE:0.02%, 0.6% of graphene, and the balance of atomized iron powder and inevitable impurities, wherein the welding wire is drawn to phi 1.6mm by a conventional preparation method, the filling rate of the flux core is 20%, RE is a compound of La, ce and Pr, and the element content of the compound satisfies La: ce =1 and Pr < La.
Example 5
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.42%, si:0.4%, mn:26.7%, cr:3.2%, ni:3.8%, cu 0.5%, mo:1.7%, ti:0.6%, RE:0.03%, 0.7% of graphene, and the balance of atomized iron powder and inevitable impurities, wherein the welding wire is drawn to phi 1.6mm by a conventional preparation method, the filling rate of the flux core is 26%, RE is a compound of La, ce and Pr, and the element content of the compound satisfies La: ce =1 and Pr < La.
Example 6
The embodiment provides a graphene-containing high-crack-resistance high-manganese steel flux-cored wire which comprises the following components in percentage by mass: c:0.36%, si:0.6%, mn:28.5%, cr:3.5%, ni:5.2%, cu 0.6%, mo:2.1%, ti:0.7%, RE:0.06%, 0.8% of graphene, and the balance of atomized iron powder and inevitable impurities, wherein the welding wire is drawn to phi 2.2mm by a conventional preparation method, the filling rate of the flux core is 25%, RE is a compound of La, ce and Pr, and the element content of the compound satisfies La: ce =1 and Pr < La.
The examples above all use MIG welding, and comparative examples 1 and 2 are selected from a brand of high manganese steel welding wire on the market.
Table 1: mechanical properties and diffusible hydrogen content
Figure SMS_1
As can be seen from the table 1, in the high-crack-resistance high-manganese steel flux-cored welding wire containing graphene, the performance of the welding wire is greatly improved due to the addition of the graphene, the tensile strength of the welding wire is higher than 1000MPa, the elongation after fracture is higher than 70% and is maximally close to 90%, meanwhile, the content of diffusible hydrogen is not more than 1.5mL/100g, the crack resistance of a weld metal is greatly improved, the strength and the toughness are improved, the welding process performance and the weld quality are good, and the high-crack-resistance high-manganese steel flux-cored welding wire is particularly suitable for manufacturing parts such as buildings, shipbuilding, railways, automobiles, aviation and aerospace.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.

Claims (10)

1. The high-crack-resistance high-manganese steel flux-cored wire containing graphene is characterized by comprising a sheath and a flux core;
the outer skin is a low-carbon steel strip coated with a graphene coating;
the medicine core comprises the following components in percentage by mass: 0.2-0.8% of C, 0.1-0.8% of Si, 17-32% of Mn, 1.5-6.5% of Cr, 1.8-5.5% of Ni, 0.5-2.8% of Cu, 1.5-3.5% of Mo, 0.2-0.8% of Ti, 0.01-0.09% of RE, 0.10-0.95% of graphene and the balance of atomized iron powder and inevitable impurities, wherein the RE is formed by compounding one or more of La, ce and Pr.
2. The graphene-containing high crack resistance high manganese steel flux-cored wire as claimed in claim 1, wherein the width of the low carbon steel strip in the sheath is 10-14mm, the thickness of the low carbon steel strip in the sheath is 0.6-1.0mm, and the high carbon steel flux-cored wire comprises the following components in percentage by mass: 0.12-0.18% of C, 0.2-0.4% of Mn, 0.02-0.06% of P, 0.02-0.05% of Si, 0.01-0.03% of N, 1-6% of graphene and the balance of Fe, and spraying graphene paint on the surface of the low-carbon steel strip to form a graphene coating; the graphene coating is prepared from the following components in percentage by mass 5:0.7:8 of graphene powder, a dispersant and a stabilizer.
3. The graphene-containing high-crack-resistance high-manganese steel flux-cored wire according to claim 1, wherein the particle size of each component in the flux core is 60-80 mesh.
4. The graphene-containing high-crack-resistance high-manganese-steel flux-cored wire according to claim 1, wherein in the high-manganese-steel flux-cored wire, a raw material of Mn is low-carbon ferromanganese, and a raw material of Si is #75 ferrosilicon; and/or the diameter of the high manganese steel flux-cored wire is 0.8-2.4mm.
5. The graphene-containing high crack resistance high manganese steel flux-cored wire according to claim 1, wherein RE in the flux core is formed by compounding one or more of La, ce and Pr, and when RE is formed by compounding La, ce and Pr, the element content satisfies La: ce =1 and Pr < La.
6. The high-crack-resistance high-manganese steel flux-cored wire containing graphene according to claim 1, wherein the graphene has a particle size of 4.00-6.00 μm and is prepared by a chemical vapor deposition method.
7. The graphene-containing high-crack-resistance high-manganese steel flux-cored wire as claimed in claim 1, wherein the filling rate of the flux core is 15% -27%, and the loose packed density is 2.27-2.92g/cm 3 。
8. The graphene-containing high crack resistance high manganese steel flux-cored wire according to claim 1, wherein the content of impurity elements of the flux core satisfies S < 0.003% and P < 0.003%.
9. The graphene-containing high crack resistance high manganese steel flux-cored wire according to claim 1, wherein the element content of the flux core satisfies Cu ≤ 0.5Ni.
10. Use of the graphene-containing high manganese steel flux-cored wire with high crack resistance as claimed in any one of claims 1 to 9 in electric arc additive manufacturing of building, shipbuilding, railway, automobile, aviation and aerospace parts.
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