CN115008065A - Flux-cored wire for high entropy of titanium-steel welding seam and preparation method thereof - Google Patents

Flux-cored wire for high entropy of titanium-steel welding seam and preparation method thereof Download PDF

Info

Publication number
CN115008065A
CN115008065A CN202210559965.9A CN202210559965A CN115008065A CN 115008065 A CN115008065 A CN 115008065A CN 202210559965 A CN202210559965 A CN 202210559965A CN 115008065 A CN115008065 A CN 115008065A
Authority
CN
China
Prior art keywords
welding
powder
titanium
flux
entropy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210559965.9A
Other languages
Chinese (zh)
Other versions
CN115008065B (en
Inventor
李红
姚永生
栗卓新
李国栋
王义朋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN202210559965.9A priority Critical patent/CN115008065B/en
Publication of CN115008065A publication Critical patent/CN115008065A/en
Application granted granted Critical
Publication of CN115008065B publication Critical patent/CN115008065B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B23K35/22—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
    • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/325—Ti as the principal 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
    • B23K35/24—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
    • B23K35/3033—Ni as the principal 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
    • B23K35/24—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
    • B23K35/3046—Co as the principal 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
    • B23K35/24—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
    • 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
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

A flux-cored wire for high entropy of titanium-steel welding seams and a preparation method thereof belong to the technical field of welding. Comprises a medicine core and a skin; the medicine core comprises the following components in percentage by mass: 10-30% of titanium powder, 10-50% of iron powder, 10-50% of niobium powder and 10-30% of molybdenum powder, wherein the sum of the mass percentages of the components is 100%; the sheath is made of Ni-Cr-Co series nickel-based alloy strip which comprises the following main components: 27-33% of Co, 26-30% of Cr, 2.5-3.5% of Fe and the balance of Ni; the coating rate of the drug core is 15%. The titanium-steel dissimilar metal fusion welding is carried out, the chemical components of the weld metal are in the range of the principal elements of the high-entropy alloy, the structural organization at the weld tends to form a simple BCC + FCC solid solution phase, the high entropy of the weld is realized, and the high-quality titanium-steel welding joint is easy to obtain.

Description

Flux-cored wire for high entropy of titanium-steel welding seam and preparation method thereof
Technical Field
The invention belongs to the technical field of welding, and relates to a flux-cored wire for high entropy of a titanium-steel welding seam and a preparation method thereof.
Background
Titanium and titanium alloy have high toughness, high specific strength, excellent high temperature resistance and corrosion resistance and other excellent characteristics, and are widely applied to the fields of aerospace, medical treatment, ships, electric power, automobile manufacturing and the like. But the price is high, and the welding and processing performance is poor, so that the industrial production requirement is difficult to meet. The stainless steel is used as a common structural material, has excellent weldability, wear resistance and mechanical properties, and is relatively low in processing cost. The titanium-stainless steel dissimilar metal composite structure is prepared by welding stainless steel with good weldability and titanium alloy with excellent corrosion resistance, so that the advantages of the two materials in performance are complemented, the cost is low, and the titanium-stainless steel dissimilar metal composite structure is widely applied to the industries such as aerospace, ocean engineering, petrochemical industry, electric power industry and the like.
But the titanium-steel has great difficulty in welding due to great difference of physical and chemical properties. In physical properties, the difference of melting points causes that firstly molten iron can infiltrate into the grain boundary of an overheated area of an unmelted base metal, so that the alloy elements are burnt out; the thermal expansion coefficient and the thermal conductivity of titanium and steel are greatly different, so that the joint has residual stress and deformation during cooling, and further cracks are generated; titanium absorbs gas at high temperature, and generates pores and other defects. Chemically, titanium-steel tends to produce large amounts of brittle intermetallics (TiFe) in the weld 2 TiFe, TiC, etc.). These problems result in lower strength titanium-steel joints. At present, methods such as brazing, diffusion welding, friction welding, explosion welding and the like are adopted for producing the titanium-steel composite component, but the methods are limited by single joint form and low production efficiency, so that the further popularization and application of the titanium-steel dissimilar metal composite structure are restricted. The fusion welding not only can realize the high-efficiency connection of the titanium-steel dissimilar materials, but also has the characteristics of high processing efficiency and flexible process.
A large number of researches show that the selection of the intermediate layer metal is the key for realizing the titanium-steel fusion welding connection, and among a plurality of reported intermediate layer materials, the titanium-steel dissimilar metal joint structure obtained by adopting the high-entropy alloy mainly comprises BCC + FCC solid solution phase, so that the joint realizes reliable metallurgical bonding. The high entropy effect of the high entropy alloy is utilized to inhibit the titanium-steel from forming brittle intermetallic compounds, and the welding seam tends to form simple BCC + FCC solid solution phase, thereby improving the toughness of the welding seam and the bonding strength, and providing a brand new technical idea for realizing high-performance fusion welding of the titanium-steel.
In the prior art, the high-entropy alloy filling material needs to be prepared in advance through processes of ball milling, vacuum arc melting and the like, then element contact is reduced by utilizing a high-entropy alloy diffusion retardation effect, and generation of intermetallic compounds is inhibited by utilizing the high-entropy effect, so that the performance of a welding seam is improved. Therefore, the flux-cored wire based on the titanium-steel welding seam high entropy is designed, so that high entropy alloy is formed at the welding seam, the high entropy effect is exerted, interface intermetallic compounds are effectively inhibited, the process is simple, the cost is low, the components of the flux-cored wire can be changed by changing the powder ratio, and the flux-cored wire has the characteristic of flexible manufacturing. The method has significant meaning for solving the welding problem of the titanium-steel dissimilar materials, reducing the preparation cost and expanding the welding application range of the high-entropy alloy.
Disclosure of Invention
The invention organically combines a high-entropy alloy technology and a flux-cored wire technology to obtain a flux-cored wire based on high entropy of a welding seam and a preparation method thereof, and aims to solve the problem that a large amount of brittle intermetallic compounds are easily formed in the welding seam to cause lower strength of a welding joint when titanium and stainless steel are directly subjected to fusion welding in the prior art. The welding seam high-entropy flux-cored welding wire is used for carrying out titanium-steel dissimilar metal fusion welding (automatic welding methods such as TIG, MIG, CMT or laser welding and the like can be adopted), the chemical components of welding seam metal are in the range of main elements of high-entropy alloy, the structural organization at the welding seam tends to form simple BCC + FCC solid solution phase, the high entropy of the welding seam is realized, and a high-quality titanium-steel welding joint is easy to obtain.
The invention also aims to manufacture the high-entropy welding material into the flux-cored wire for automatic welding, improve the welding efficiency of the titanium-steel dissimilar metal and reduce the cost.
The technical scheme adopted by the invention is that the high-entropy flux-cored welding wire for the titanium-steel welding comprises a flux core and a sheath.
The medicine core comprises the following components in percentage by mass: 10-30% of titanium powder, 10-50% of iron powder, 10-50% of niobium powder and 10-30% of molybdenum powder, wherein the sum of the mass percentages of the components is 100%; the sheath is made of Ni-Cr-Co series nickel-based alloy strip which comprises the following main components: 27-33% of Co, 26-30% of Cr, 2.5-3.5% of Fe and the balance of Ni. The coating rate of the drug core is 15%.
Preferably, the medicine core consists of the following components in percentage by mass: 10 percent of Ti, 20 percent of Fe, 40 percent of Nb and 30 percent of Mo, and the sum of the mass percentages is 100 percent.
Preferably, the medicine core consists of the following components in percentage by mass: 20 percent of Ti, 30 percent of Fe, 30 percent of Nb and 20 percent of Mo, and the sum of the mass percentages is 100 percent.
Preferably, the medicine core consists of the following components in percentage by mass: 30% of Ti, 40% of Fe, 20% of Nb and 20% of Mo, wherein the sum of the mass percentages is 100%.
The present invention is also characterized in that,
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes.
The invention adopts another technical scheme that the preparation method of the high-entropy flux-cored welding wire for the welding seam of the titanium-steel welding is implemented according to the following steps:
step 1, respectively weighing 10-30% of metal titanium powder, 10-50% of metal iron powder, 10-50% of metal niobium powder and 10-30% of molybdenum powder in percentage by mass, wherein the sum of the mass percentages of the components is 100%; respectively putting the materials into a vacuum furnace, adding the materials to the temperature of 150 ℃, and then preserving the heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
step 2, cleaning the nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
step 3, pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to a filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and 4, placing the welding wire on a reducing mill, replacing dies with different apertures, and reducing the diameter step by step, preferably reducing the diameter by 0.1mm in each drawing, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The present invention is also characterized in that,
the purity of the titanium powder in the step 1 is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes.
In the process of powder preparation and selection of outer skin, the reasons for limiting the composition and content of each chemical element are respectively as follows:
in order to improve the comprehensive mechanical properties of the titanium and steel welded joint, the chemical composition of the weld metal needs to be kept within the range of the principal elements forming the high-entropy alloy. Aiming at the composition characteristics of Ti and Fe of base metal to be welded, Ti-Co-Cr-Ni-Fe five-principal-element high-entropy alloy is selected for the welding wire. The main reasons are the following:
1. in the welding process, the melting of the base metal and the dissolution of the base metal in a near seam area to a molten pool are inevitable, so that the Ti and Fe elements in a welding seam are increased, and the content of the two elements in the welding wire is lower than that of other main elements.
2. Co and Cr have good compatibility with metals Fe and Ti, hardly affect the structure of the alloy and effectively avoid the generation of brittle intermetallic compounds.
3. By adding Ni element into the welding wire, the Ni element can be infinitely dissolved with Fe and can be mutually dissolved with Ti, Co, Cr and the like, and the addition of Ni can improve the compatibility of a welding line and a parent metal and inhibit the generation of intermetallic compounds.
4. The trace Nb element and titanium can form an infinite solid solution, have good mutual solubility, can refine titanium crystal grains and improve the oxidation resistance of a welding joint; the trace Mo element has solid solution strengthening effect on ferrite, can refine titanium structure, reduce alloy thermal expansion coefficient and has great effect on improving weld toughness.
The high-entropy flux-cored welding wire is used for welding, the weld metal is high-entropy alloy, high entropy of the weld is realized, the generation of brittle intermetallic compounds is effectively inhibited, and the strength of a welding joint is high.
The flux-cored wire has the beneficial effects that the high-entropy alloy technology and the flux-cored wire technology are organically combined to obtain the flux-cored wire with high entropy of the welding seam, the flux-cored wire is used for carrying out automatic welding on titanium-steel dissimilar metals, high efficiency is realized while a high-quality titanium-steel welding joint is obtained, the chemical components of the welding seam metal are in the range of principal elements of the high-entropy alloy, the structural organization at the welding seam tends to form a simple BCC + FCC solid solution phase, and the high entropy of the welding seam is realized. The growth of a brittle intermetallic compound phase is effectively inhibited at the welding seam by utilizing the high entropy effect, and the comprehensive mechanical property is good.
The high-entropy flux-cored welding wire for the welding seam is reasonable in design, easy to machine and form and low in cost, is simple in operation process, convenient and efficient, facilitates large-scale batch production, and has good market application value.
The specific implementation mode is as follows:
the present invention will be further described by the following examples, but it should be noted that the practice of the present invention is not limited to the following examples.
The flux-cored wire for titanium-steel welding comprises a flux core and a sheath, wherein the flux core comprises the following components in percentage by mass: 10-30% of titanium powder, 10-50% of iron powder, 10-50% of niobium powder and 10-30% of molybdenum powder, wherein the sum of the mass percentages of the components is 100%; the outer skin is Ni-Cr-Co series nickel-based alloy belt with the thickness of 0.3mm and the width of 10 mm.
The purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
the nickel-based alloy steel strip comprises the following main components in percentage by weight: 27-33% of Co, 26-30% of Cr, 2.5-3.5% of Fe and the balance of Ni.
The invention relates to a preparation method of a high-entropy flux-cored welding wire for welding a welding seam of titanium-stainless steel, which is implemented according to the following steps:
respectively weighing 10-30% of metal titanium powder, 10-50% of metal iron powder, 10-50% of metal niobium powder and 10-30% of molybdenum powder in percentage by mass, wherein the sum of the mass percentages of the components is 100%; respectively putting the mixture into a vacuum furnace, adding the mixture to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove, closing the U-shaped groove on a flux-cored wire forming machine to form an O shape, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and reducing the diameter step by step for drawing, wherein the diameter reducing range of each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
Example 1
Respectively weighing 30% of metal molybdenum powder, 10% of metal iron powder and 50% of niobium powder by mass percent, wherein the sum of the mass percentages of the components is 100%, respectively putting the components into a vacuum furnace, adding the components to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and gradually reducing the diameter for drawing, wherein the diameter reduction amplitude for each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The flux-cored wire prepared in the embodiment 1 is used for welding TA2-304 stainless steel, and the welding process comprises the following steps: the method comprises the steps of performing lap welding on a TA2 titanium plate at the top and a 304 stainless steel plate at the bottom, performing welding under the conditions that consumable electrode gas shielded welding is adopted, argon (with the purity of 99.99 percent and the gas flow rate of 1.8L/min) is adopted as gas, the welding current is 70A, the welding voltage is 9.2V, the wire feeding speed is 2.0m/min and the welding speed is 3.3mm/s, and controlling the components of a welding line within the range of effective components for forming the high-entropy alloy.
Measuring the content of main elements of the weld metal after welding (including the following atomic percent \ at%)
Fe Cr Ni Co Ti Nb Mo
Content (wt.) 11.88％ 24.20％ 23.06％ 20.67％ 15.65％ 2.53％ 2.00％
According to formula of entropy value
Figure BDA0003652470860000031
Enthalpy value formula
Figure BDA0003652470860000032
Atomic radius difference formula
Figure BDA0003652470860000041
Formula of mean valence electron concentration
Figure BDA0003652470860000042
Figure BDA0003652470860000043
The entropy value is calculated to be 1.55R-12.88 KJ -1 mol -1 (1.55R>1.5R), the mixed enthalpy value is-13.79 KJ/mol (-15 KJ/mol)<-13.79KJ/mol<5KJ/mol) and an atomic radius difference of 5.67% (5.67%<6%) and an average valence electron concentration of 7.19 (6.5)<7.19<8). The welding seam component is known to be high-entropy alloy through theoretical calculation and actual detection, the welding seam achieves the high-entropy effect, and the welding seam area is composed of a BCC + FCC solid solution phase. The observation shows that the interface of the welding joint is well combined, and no obvious welding defect and crack are seen. And (3) testing the mechanical property of the sample according to the tensile test method of GB/T2651-.
Example 2
Respectively weighing 30% of metal molybdenum powder, 20% of metal iron powder, 10% of metal titanium powder and 40% of niobium powder by mass percent, wherein the sum of the mass percentages of the components is 100%, respectively putting the components into a vacuum furnace, adding the components to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and reducing the diameter step by step for drawing, wherein the diameter reducing range of each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The flux-cored wire prepared in the embodiment 1 is used for welding TA2-304 stainless steel, and the welding process comprises the following steps: the method comprises the steps of performing lap welding on a TA2 titanium plate at the top and a 304 stainless steel plate at the bottom, performing welding under the conditions that consumable electrode gas shielded welding is adopted, argon (with the purity of 99.99 percent and the gas flow rate of 1.8L/min) is adopted as gas, the welding current is 70A, the welding voltage is 9.2V, the wire feeding speed is 2.0m/min and the welding speed is 3.3mm/s, and controlling the components of a welding line within the range of effective components for forming the high-entropy alloy.
Measuring the content of each main element of the weld metal (including atomic percent \ at%) after welding
Fe Cr Ni Co Ti Nb Mo
Content (wt.) 12.61％ 24.13％ 22.99％ 20.61％ 15.60％ 2.06％ 2.00％
According to formula of entropy value
Figure BDA0003652470860000044
Enthalpy value formula
Figure BDA0003652470860000045
Atomic radius difference formula
Figure BDA0003652470860000046
Formula of mean valence electron concentration
Figure BDA0003652470860000047
Calculated, the alloy entropy value is 1.56R-12.97 KJ -1 mol -1 (1.56R>1.5R), the mixed enthalpy value is-13.82 KJ/mol (-15 KJ/mol)<-13.82KJ/mol<5KJ/mol) and an atomic radius difference of 5.62% (5.62%<6%) and an average valence electron concentration of 7.23 (6.5)<7.23<8). The welding seam component known through theoretical calculation and actual detection is high-entropy alloy, the welding seam achieves a high-entropy effect, and the welding seam area is composed of BCC + FCC solid solution phase. The detection shows that the weld metal is well fused and the fusion area has no crackThe grains and the close part of the fusion line are dense isometric crystals and dendrites. And (3) testing the mechanical property of the sample according to the tensile test method of GB/T2651-.
Example 3
Respectively weighing 20% of metal molybdenum powder, 30% of metal iron powder, 20% of metal titanium powder and 30% of niobium powder by mass percent, wherein the sum of the mass percentages of the components is 100%, respectively putting the components into a vacuum furnace, adding the components to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and gradually reducing the diameter for drawing, wherein the diameter reduction amplitude for each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The flux-cored wire prepared in the embodiment 1 is used for welding TA2-304 stainless steel, and the welding process comprises the following steps: the method comprises the steps of performing lap welding on a TA2 titanium plate at the top and a 304 stainless steel plate at the bottom, performing welding under the conditions that consumable electrode gas shielded welding is adopted, argon (with the purity of 99.99 percent and the gas flow rate of 1.8L/min) is adopted as gas, the welding current is 70A, the welding voltage is 9.2V, the wire feeding speed is 2.0m/min and the welding speed is 3.3mm/s, and controlling the components of a welding line within the range of effective components for forming the high-entropy alloy.
Measuring the content of each main element of the weld metal (including atomic percent \ at%) after welding
Fe Cr Ni Co Ti Nb Mo
Content (wt.) 13.30％ 23.98％ 22.85％ 20.49％ 16.4％ 1.59％ 1.39％
According to formula of entropy value
Figure BDA0003652470860000051
Enthalpy value formula
Figure BDA0003652470860000052
Atomic radius difference formula
Figure BDA0003652470860000053
Mean valence electron concentrationFormula (II)
Figure BDA0003652470860000054
The alloy entropy value is calculated to be 1.58R-13.14 KJ -1 mol -1 (1.58R>1.5R), the mixed enthalpy value is-14.39 KJ/mol (-15 KJ/mol)<-14.39KJ/mol<5KJ/mol) and an atomic radius difference of 5.6% (5.6%<6%) and an average valence electron concentration of 7.29 (6.5%)<7.29<8). The welding seam component known through theoretical calculation and actual detection is high-entropy alloy, the welding seam achieves a high-entropy effect, and the welding seam area is composed of BCC + FCC solid solution phase. The detection shows that the metal fusion of the welding seam is good, the defects of surface pores, inclusion and the like are avoided, and the welding seam structure is basically compact isometric crystals and dendrites. And (3) testing the mechanical property of the sample according to the tensile test method of GB/T2651-.
Example 4
Respectively weighing 20% of metal molybdenum powder, 40% of metal iron powder, 20% of metal titanium powder and 20% of niobium powder by mass percentage, wherein the sum of the mass percentages of the components is 100%, respectively putting the components into a vacuum furnace, adding the components to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and reducing the diameter step by step for drawing, wherein the diameter reducing range of each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The flux-cored wire prepared in the embodiment 1 is used for welding TA2-304 stainless steel, and the welding process comprises the following steps: the method comprises the steps of performing lap welding on a TA2 titanium plate at the top and a 304 stainless steel plate at the bottom, performing welding under the conditions that consumable electrode gas shielded welding is adopted, argon (with the purity of 99.99 percent and the gas flow rate of 1.8L/min) is adopted as gas, the welding current is 70A, the welding voltage is 9.2V, the wire feeding speed is 2.0m/min and the welding speed is 3.3mm/s, and controlling the components of a welding line within the range of effective components for forming the high-entropy alloy.
Measuring the content of each main element of the weld metal (including atomic percent \ at%) after welding
Fe Cr Ni Co Ti Nb Mo
Content (wt.) 14.02％ 23.91％ 22.78％ 20.42％ 16.35％ 1.13％ 1.39％
According to formula of entropy value
Figure BDA0003652470860000061
Enthalpy value formula
Figure BDA0003652470860000062
Atomic radius difference formula
Figure BDA0003652470860000063
Formula of mean valence electron concentration
Figure BDA0003652470860000064
The alloy entropy value is calculated to be 1.58R-13.14 KJ -1 mol -1 (1.58R>1.5R), the mixed enthalpy value is-14.41 KJ/mol (-15 KJ/mol)<-14.41KJ/mol<5KJ/mol) and an atomic radius difference of 5.56% (5.56%<6%) and an average valence electron concentration of 7.33 (6.5)<7.33<8). The welding seam component known through theoretical calculation and actual detection is high-entropy alloy, the welding seam achieves a high-entropy effect, and the welding seam area is composed of BCC + FCC solid solution phase. The detection shows that the metal fusion of the welding seam is good, the defects of surface pores, inclusion and the like are avoided, and the welding seam structure is basically compact isometric crystals and dendrites. And (3) testing the mechanical property of the sample according to the tensile test method of GB/T2651-.
Example 5
Respectively weighing 50% of metal iron powder, 30% of metal titanium powder, 10% of metal molybdenum powder and 10% of niobium powder by mass percent, wherein the sum of the mass percentages of the components is 100%, respectively putting the components into a vacuum furnace, adding the components to 150 ℃, and then preserving heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
the purity of the titanium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes;
cleaning a nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to the filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and then putting the welding wire on a reducing mill, replacing dies with different apertures, and reducing the diameter step by step for drawing, wherein the diameter reducing range of each drawing is 0.1mm, and finally preparing the flux-cored wire with the diameter of 1.2 mm.
The flux-cored wire prepared in the embodiment 1 is used for welding TA2-304 stainless steel, and the welding process comprises the following steps: the method comprises the steps of performing lap welding on a TA2 titanium plate at the top and a 304 stainless steel plate at the bottom, performing welding under the conditions that consumable electrode gas shielded welding is adopted, argon (with the purity of 99.99 percent and the gas flow rate of 1.8L/min) is adopted as gas, the welding current is 70A, the welding voltage is 9.2V, the wire feeding speed is 2.0m/min and the welding speed is 3.3mm/s, and controlling the components of a welding line within the range of effective components for forming the high-entropy alloy.
Measuring the content of each main element of the weld metal (including atomic percent \ at%) after welding
Fe Cr Ni Co Ti Nb Mo
Content (wt.) 14.69％ 23.77％ 22.65％ 20.30％ 17.13％ 0.67％ 0.80％
According to formula of entropy value
Figure BDA0003652470860000065
Enthalpy value formula
Figure BDA0003652470860000066
Atomic radius difference formula
Figure BDA0003652470860000067
Formula of mean valence electron concentration
Figure BDA0003652470860000068
Calculated, the alloy entropy value is 1.59R-13.22 KJ -1 mol -1 (1.59R>1.5R), the mixed enthalpy value is-14.98 KJ/mol (-15 KJ/mol)<-14.98KJ/mol<5KJ/mol) and an atomic radius difference of 5.54% (5.54%<6%) and an average valence electron concentration of 7.39 (6.5)<7.39<8). The welding seam component known through theoretical calculation and actual detection is high-entropy alloy, the welding seam achieves a high-entropy effect, and the welding seam area is composed of BCC + FCC solid solution phase. The detection shows that the weld metal fusion is good, the fusion area has no cracks, and the weld tissue is compact isometric crystal and dendrite. And (3) testing the mechanical property of the sample according to a GB/T2651-2008 welding joint tensile test method, wherein the tensile strength is 312 MPa.

Claims (9)

1. A high-entropy flux-cored welding wire for a welding seam of titanium-steel welding is characterized by comprising a flux core and a sheath;
the medicine core comprises the following components in percentage by mass: 10-30% of titanium powder, 10-50% of iron powder, 10-50% of niobium powder and 10-30% of molybdenum powder, wherein the sum of the mass percentages of the components is 100%; the sheath is made of Ni-Cr-Co series nickel-based alloy strip which comprises the following main components: 27-33% of Co, 26-30% of Cr, 2.5-3.5% of Fe and the balance of Ni; the coating rate of the drug core is 15%.
2. The high-entropy flux-cored welding wire for the welding seam of the titanium-steel welding as claimed in claim 1, wherein the flux-cored welding wire comprises the following components in percentage by mass: 10 percent of Ti, 20 percent of Fe, 40 percent of Nb and 30 percent of Mo, and the sum of the mass percentages is 100 percent.
3. The high-entropy flux-cored welding wire for the welding seam of the titanium-steel welding as claimed in claim 1, wherein the flux-cored welding wire comprises the following components in percentage by mass: 20% of Ti, 30% of Fe, 30% of Nb and 20% of Mo, wherein the sum of the mass percentages is 100%.
4. The high-entropy flux-cored welding wire for the welding seam of the titanium-steel welding as claimed in claim 1, wherein the flux-cored welding wire comprises the following components in percentage by mass: 30% of Ti, 40% of Fe, 20% of Nb and 20% of Mo, wherein the sum of the mass percentages is 100%.
5. The high-entropy flux-cored welding wire for the welding line of the titanium-steel welding as claimed in claim 1, wherein the purity of titanium powder is more than or equal to 99.95%, and the particle size is 100 meshes; the purity of the iron powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the niobium powder is more than or equal to 99.95 percent, and the particle size is 100 meshes; the purity of the molybdenum powder is more than or equal to 99.95 percent, and the particle size is 100 meshes.
6. The preparation method of the welding seam high-entropy flux-cored welding wire for the titanium-steel welding, which is characterized by comprising the following steps of:
step 1, respectively weighing 10-30% of metal titanium powder, 10-50% of metal iron powder, 10-50% of metal niobium powder and 10-30% of molybdenum powder in percentage by mass, wherein the sum of the mass percentages of the components is 100%; respectively putting the materials into a vacuum furnace, adding the materials to the temperature of 150 ℃, and then preserving the heat for 2 hours; then putting the dried molybdenum powder, titanium powder, iron powder and niobium powder into a powder mixer, and uniformly stirring;
step 2, cleaning the nickel-based alloy strip by using cleaning equipment, drying the nickel-based alloy strip at 85 ℃, and rolling the nickel-based alloy strip into a U-shaped groove;
step 3, pouring the mixed powder onto a feeder, and filling the mixed powder onto a nickel-based alloy strip with a U-shaped groove according to a filling rate of 15%; closing the U-shaped groove to form an O shape on a flux-cored wire forming machine, and drawing the O shape into a welding wire with the diameter of 2.5 mm;
and 4, placing the welding wire on a reducing mill, replacing dies with different apertures, and reducing and drawing the welding wire step by step.
7. The method of claim 6, wherein in step 4, each drawing pass is reduced by 0.1mm to finally produce a flux cored wire having a diameter of 1.2 mm. .
8. The use of the high-entropy flux-cored welding wire for the weld joint of titanium-steel welding in any one of claims 1 to 5 for titanium-steel dissimilar metal fusion welding.
9. The application of claim 8, so that the chemical composition of the weld metal is kept in the range of main elements forming the high-entropy alloy, and the structural structure at the weld tends to form a simple BCC + FCC solid solution phase, thereby realizing high entropy of the weld.
CN202210559965.9A 2022-05-19 2022-05-19 Flux-cored wire for high entropy of titanium-steel weld joint and preparation method thereof Active CN115008065B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210559965.9A CN115008065B (en) 2022-05-19 2022-05-19 Flux-cored wire for high entropy of titanium-steel weld joint and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210559965.9A CN115008065B (en) 2022-05-19 2022-05-19 Flux-cored wire for high entropy of titanium-steel weld joint and preparation method thereof

Publications (2)

Publication Number Publication Date
CN115008065A true CN115008065A (en) 2022-09-06
CN115008065B CN115008065B (en) 2023-09-01

Family

ID=83068987

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210559965.9A Active CN115008065B (en) 2022-05-19 2022-05-19 Flux-cored wire for high entropy of titanium-steel weld joint and preparation method thereof

Country Status (1)

Country Link
CN (1) CN115008065B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116511757A (en) * 2023-05-16 2023-08-01 内蒙古科技大学 Welding wire material for dissimilar welding of steel and high-entropy alloy and preparation method thereof

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005059077A (en) * 2003-08-18 2005-03-10 Kobe Steel Ltd Ni RADICAL ALLOY FLUX CORED WIRE
CN104741834A (en) * 2015-03-06 2015-07-01 西安理工大学 Flux-cored wire for welding X90 pipeline steel and preparing method thereof
CN104907740A (en) * 2015-06-15 2015-09-16 西安理工大学 Cu-Mo-Nb welding wire for titanium-pipeline steel welding and manufacturing method thereof
CN105081620A (en) * 2015-09-15 2015-11-25 北京工业大学 Nickel-base 625 flux-cored wire suitable for full-position welding
DE102017213391A1 (en) * 2016-08-04 2018-02-08 Honda Motor Co., Ltd. Multimaterial component and method for its production
CN107999991A (en) * 2018-01-22 2018-05-08 太原理工大学 High entropy flux-cored wire for titanium-steel MIG welding and preparation method thereof
CN109128585A (en) * 2017-06-27 2019-01-04 宝山钢铁股份有限公司 A kind of high heat-input electro-gas (enclosed) welding gas shielded flux cored wire based on microstructure homogenization mechanism
CN111958146A (en) * 2020-08-04 2020-11-20 北京工业大学 Copper-plating-free welding wire containing nano ionic liquid lubricating coating and preparation method thereof
CN113210926A (en) * 2021-05-28 2021-08-06 华东交通大学 Preparation method of multi-principal-element welding wire and high-entropy welding method
US20210260704A1 (en) * 2020-02-24 2021-08-26 Honda Motor Co., Ltd. Multi component solid solution high-entropy alloys
CN113814606A (en) * 2021-08-20 2021-12-21 西安理工大学 Ni-Cr-Al-Ti-Co welding wire, method and groove form

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005059077A (en) * 2003-08-18 2005-03-10 Kobe Steel Ltd Ni RADICAL ALLOY FLUX CORED WIRE
CN104741834A (en) * 2015-03-06 2015-07-01 西安理工大学 Flux-cored wire for welding X90 pipeline steel and preparing method thereof
CN104907740A (en) * 2015-06-15 2015-09-16 西安理工大学 Cu-Mo-Nb welding wire for titanium-pipeline steel welding and manufacturing method thereof
CN105081620A (en) * 2015-09-15 2015-11-25 北京工业大学 Nickel-base 625 flux-cored wire suitable for full-position welding
DE102017213391A1 (en) * 2016-08-04 2018-02-08 Honda Motor Co., Ltd. Multimaterial component and method for its production
CN109128585A (en) * 2017-06-27 2019-01-04 宝山钢铁股份有限公司 A kind of high heat-input electro-gas (enclosed) welding gas shielded flux cored wire based on microstructure homogenization mechanism
CN107999991A (en) * 2018-01-22 2018-05-08 太原理工大学 High entropy flux-cored wire for titanium-steel MIG welding and preparation method thereof
US20210260704A1 (en) * 2020-02-24 2021-08-26 Honda Motor Co., Ltd. Multi component solid solution high-entropy alloys
CN111958146A (en) * 2020-08-04 2020-11-20 北京工业大学 Copper-plating-free welding wire containing nano ionic liquid lubricating coating and preparation method thereof
CN113210926A (en) * 2021-05-28 2021-08-06 华东交通大学 Preparation method of multi-principal-element welding wire and high-entropy welding method
CN113814606A (en) * 2021-08-20 2021-12-21 西安理工大学 Ni-Cr-Al-Ti-Co welding wire, method and groove form

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116511757A (en) * 2023-05-16 2023-08-01 内蒙古科技大学 Welding wire material for dissimilar welding of steel and high-entropy alloy and preparation method thereof
CN116511757B (en) * 2023-05-16 2024-04-09 内蒙古科技大学 Welding wire material for dissimilar welding of steel and high-entropy alloy and preparation method thereof

Also Published As

Publication number Publication date
CN115008065B (en) 2023-09-01

Similar Documents

Publication Publication Date Title
CN108161278A (en) High entropy flux-cored wire for aluminium-steel MIG welding and preparation method thereof
CN107999991A (en) High entropy flux-cored wire for titanium-steel MIG welding and preparation method thereof
CN113399861B (en) Copper-nickel-based welding wire for copper-steel transition layer melting-brazing and preparation method thereof
CN108161277A (en) High entropy flux-cored wire for aluminium-steel submerged arc welding and preparation method thereof
CN110560961A (en) Ta and Nb composite nickel-based welding wire for nuclear power equipment and welding method
CN114505619B (en) Nickel-based welding wire, manufacturing method of nickel-based welding wire and welding process of nickel-based welding wire
CN105081610B (en) It is exclusively used in the metal powder core solder wire of hot-work die reparation
CN104476011B (en) High-entropy alloy welding wire and the application of titanium/mild steel is welded for TIG
CN110576273A (en) Metal material, process and product for welding LNG (liquefied natural gas) ultralow-temperature stainless steel
CN110369906B (en) Metal flux-cored wire for welding T2 copper and 304 stainless steel and preparation method thereof
CN111604618A (en) Stainless steel argon tungsten-arc welding active agent and preparation method and application thereof
TW201722608A (en) Welding flux for austenitic stainless steel
CN105127613A (en) Flux-cored wire for welding Q420 steel and preparation method thereof
CN115008065B (en) Flux-cored wire for high entropy of titanium-steel weld joint and preparation method thereof
JP3850764B2 (en) Welding wire for high Cr ferritic heat resistant steel
CN113828960B (en) Welding material and welding method for butt welding of copper-steel composite plates
CN107378305A (en) Titanium-steel dissimilar metal plate sheet welding flux-cored wire and preparation method thereof
CN104511700A (en) Nickel base alloy welding wire and preparation method thereof
CN112719692B (en) 900 MPa-grade high-strength steel gas shielded solid welding wire and preparation method thereof
JPH01168837A (en) High molybdenum base alloy
JP3758350B2 (en) Narrow groove TIG welding method of high Mn stainless steel for cryogenic temperature and welded structure with excellent cryogenic toughness
CN104907734B (en) Titanium tube line steel composite board flux-cored wire used for welding and preparation method thereof
CN108393609A (en) Flux-cored wire and gas shield welding connect method
CN114248040B (en) High-strength anti-crack metal powder cored flux-cored wire for engineering machinery
JP3695925B2 (en) Narrow groove MIG welding method of high Mn stainless steel for cryogenic temperature and welded structure with excellent cryogenic toughness

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant