Nanostructured powder wire

FIELD: metallurgy.

SUBSTANCE: on the external and/or internal surface of the metal shell of power wire there is a nanocomposite coating in the form of a metal matrix with a mixture of nanosize particles of metal fluoride and rare earth metals distributed in it. The charge placed in the cavity of the shell comprises slag-generating, gas-generating, ionising and alloying components. The specified coating has the following ratio of volumes of the matrix and nanosize particles, %: metal matrix 55-98, nanosize particles of metal fluoride 1-30, nanosize particles of rare earth metals 1-15.

EFFECT: wire has good welding-technological properties, makes it possible to improve atomised transition of electrode metal and makes it possible to improve mechanical properties of welded connections.

2 cl, 2 tbl, 1 dwg

 

The present invention relates primarily to mechanical engineering and can be used in arc welding and cladding of metal parts.

Known welding electrode wire (Paton, B. E., N. Voropai.M., Nikiforov, B. A. and other Welding electrode wire. UK 35/06, 35/10. USSR author's certificate No. 1696231 from 09.02.1987, bull. No. 45 dated 07.12.1991 year). This wire consists of a metal rod with the internal channel, the cavity of which is filled with slag-forming and alloying components, and the external and internal surfaces of the rod applied metal coating. This wire improves droplet transfer of electrode metal, but it is not in the composition of the activating flux and is not able to increase the depth of penetration of the metal. In addition, the wire has no gas-forming components and may only be used when welding in shielding gases, and its production has a high complexity, which increases the cost of the wire.

Known wire for welding (N. Voropai.M., Buchinskaya C. N., Kosteniuk N. And. and other Wire for welding. UK 35/08, USSR Author's certificate No. 916191 from 02.02.1980, bull. No. 12 of 30.03.1982 g) having an inner cavity filled with activating flux, which is surrounded by two metal shells. This wire improves droplet transfer e is estradiolo metal and is able to increase the depth of penetration of the metal. However, this wire also has no slag-forming and gas-forming components and may only be used when welding in shielding gases, and its production has a high complexity, which increases the cost of the wire.

Known composite electrode wire for welding and surfacing (Parshin S. G., Parshin S. C. Composite electrode wire. IPC WC 35/368, WK 35/10. RF patent №2355543 from 09.07.2007 g), which was adopted for the prototype. This wire consists of a metal tube placed in the cavity of the charge of a mixture of slag-forming and gas-forming components. On the surface of the metal tube is coated with a composite coating of a metal matrix with distributed it dispersed phase of the activating flux. This wire allows you to increase the depth of penetration of the metal and to improve drip transfer of electrode metal in the weld pool.

However, the wire on the prototype is not in the charge of ionizing and alloying components, resulting in poor arc stability and mechanical properties of the weld metal. For the deposition of composite coatings for prototype use fine activating flux with particle size greater than 50 microns, which contains hygroscopic chlorides and bromides, which degrades the durability of the coating and uvelichenie is its roughness. In addition, this wire is made from a solid metal tube, which increases the complexity and cost of manufacture of the wire.

The technical result of the invention is the improvement of droplet transfer of electrode metal and the mechanical properties of weld metal due to the introduction of the charge of ionizing and alloying components, and applying to the surface of the wire nanocomposite coatings containing nano-sized particles of a fluoride, and rare earth metals.

The essence of the invention lies in the fact that the flux-cored wire shell place nanocomposite coating, and in the cavity of the shell powder mixture, of a mixture of mineral components and ferroalloys. Unlike the prototype, flux-cored wire is made of steel strip, which is bent in the form of a closed hollow section circular cross-section, which has a longitudinal seam edges. The cavity profile, fill with a mixture of slag-forming mixture, the gas, ionizing and alloying components, and on the surface of the shell is applied nanocomposite coating consisting of a metal matrix nano-sized particles of metal fluoride and a rare earth metal with a particle size less than 1000 nm.

As the metal matrix used is copper, Nickel, titanium. These metals have high plasticity, which is characterized by relative elongation tensile metal: copper (about 45%), Nickel (about 40%), titanium (about 40%). High plasticity of these metals allows for the electrochemical machining to form a metal rod dense nanocomposite coating with high adhesion by reducing internal stresses and obtain a fine-grained microstructure.

As the metal fluoride used fluoride salts of alkali and alkaline earth metals, such as CsF, LiF, KF, NaF, CaF2, MgF2, SrF2, BaF2. When welding fluoride salts decompose with the release of significant amounts of fluoride, which promotes intensive metallurgical reactions by binding of molecules, atoms and ions of hydrogen with the formation of gaseous hydrogen fluoride HF, which reduces the residual level of diffusible hydrogen, the formation of defects and improves the quality of welded joints. Formed by the decomposition of alkaline and alkaline-earth metals have low ionization potentials: Cs (3,88 eV), Li (lower than the 5.37 eV), K (4,32 eV), Na (5,12 eV), CA (6,09 eV), Mg (to 7.61 eV), Sr (5,67 eV), BA (5,19 eV), which improves the arc stability and reduces the arc voltage.

In addition, the fluorides of alkali and alkaline-earth metals to reduce the surface of the ing the tension of the molten metal, which contributes to size reduction of the droplets of the metal electrode during welding (see Lepinski B. M., Manakov, A. I. Physical chemistry of the oxide and akceptowalnym melts. M.: Nauka, 1977. - 192 S.).

Nanocomposite coating has the following volume ratio of the matrix and nano-particles in the coating, %:

Metal matrix - 55-98;

Nanosized particles of metal fluoride - 1-30;

Nano-sized particles of rare earth metals - 1-15.

When the amount of fluoride less than 1% no impact composite coating on the process of droplet transfer and destruction of hydrogen, while increasing the amount of more than 30% reduced arc stability. When the amount of rare earth metals is less than 1% reduced the influence of the coating on the processes of modification and improvement of the microstructure of the weld metal, while increasing the volume more than 15% deterioration in the mechanical properties of the weld metal and the electrical conductivity of the composite coating.

This combination of known and new features can improve drip transition, arc stability and mechanical properties of the weld metal. This is possible because when heated, the mixture of slag-forming and gas-forming components of the slag and carbon dioxide, which push the air of the atmosphere and prevent its penetration in C is well-welding. Contained in the charge ionizing components, for example potassium carbonate, lithium carbonate, sodium carbonate increase the degree of ionization of the arc, and the stability of combustion. The alloying components of the charge, such as ferroalloys, FeMn, FeSi, FeTi, promote alloying the weld pool manganese, silicon, titanium, which increases the strength and ductility of the weld metal.

Nanocomposite coating consisting of a metal matrix and nano-sized particles of a fluoride, and rare earth metals improves drip transition by reducing the interfacial tension of the molten shell. Fluoride binding molecules, atoms and ions of hydrogen with the formation of hydrogen fluoride HF, which reduces the formation of defects and improves the mechanical characteristics of the welded joints.

Nano-sized particles of rare-earth metals are transferred from the coating to the weld pool, and help to get fine-grained microstructure, which increases the ductility and impact toughness of welded joints.

The present invention is illustrated in the drawing, which shows a view of nanostructured cored wire with nanocomposite coating and the charge of slag-forming mixture, the gas, ionizing and alloying components, see figure 1. We offer wire sostoi the metal shell 1 to junction 2, the cavity of which is filled with mixture 3. On the surface of the shell are external and internal nanocomposite coatings 4, 5, consisting of a metal matrix 6 distributed by volume of the matrix with nanosized particles of fluoride metal and rare-earth metals 7.

The purpose of the invention is achieved in that on the surface of the cored wire is placed nanocomposite coating consisting of a metal matrix and nano-sized particles of a fluoride, and rare earth metals with particle size less than 1000 nm, and the cavity of the shell is filled with a batch of slag-forming mixture, the gas, ionizing and alloying components.

During melting of the slag coating film of fluoride, which helps to reduce the interfacial tension of the molten metal (see Lepinski B. M., Manakov, A. I. Physical chemistry of the oxide and akceptowalnym melts. M.: Nauka, 1977. - 192 S.). As a result of this reduced diameter drops and increases the frequency of droplet transfer.

Contained in the charge ionizing components, for example potassium carbonate, lithium carbonate, sodium carbonate increase the degree of ionization of the arc, and the stability of combustion. The alloying components of the charge, such as ferroalloys, FeMn, FeSi, FeTi, promote alloying the weld pool manganese, kremna is, titanium, participate in reactions of reduction, removal of oxides, associated impurities of sulfur and phosphorus. These processes lead to an increase in the strength and ductility of the weld metal (see Petrov, L. Welding materials. M: mechanical engineering, 1972 - 280 C.).

The introduction of rare earth metals (REM) - cerium, yttrium, lanthanum, scandium improves the mechanical properties of weld metal by microalloying and modification of the microstructure. Nanoparticles of rare-earth metals have a large specific surface area, which promotes intensive metallurgical refining reactions by binding the residual gases, sulfur, phosphorus refractory compounds (see Kachanov E. B. State and prospects of development of heat-resistant alloys for turbine blades. The technology of light alloys, 2005, No. 1-4, S. 10-17).

Production technology, we offer wire based on using known industry methods. For the manufacture of flux-cored wire used for plastic deformation of the metal strip in a rolling mill with simultaneous filling of the charge to bend the tape, followed by compression to the formation of a closed shell with a longitudinal seam edges. Then the semi-finished product with the charge is subjected to drawing to reduce the outer diameter of the wire (see pokhodnya, I. K., and etc. welding of the powder provoloka is. - Kiev: Naukova Dumka, 1972, 224 S.).

For the deposition of nanocomposite coatings using the method of electrochemical deposition of composite coatings from an electrolyte containing colloidal nano-sized particles (see Saifullin R. C. Composite electrochemical coatings and materials. M. Chemistry, 1972, 168 S. and Poole Am, Owen F. Nanotechnology. transl. from the anl. M: Technosphere, 2005. - 336 S.). Purified after drawing cored wire is immersed in the electrolytic bath, which contains colloidal electrolyte solution, with nanosized particles of size less than 1000 nm in the desired concentration. Cored wire is connected to the negative pole of the power source. When the action electropolymerization forces on the wire surface are deposited nano-sized particles of a fluoride, and rare earth metals, which sarasaviya positive ions recovered from the electrolyte of the metal. For uniform distribution of nano-particles in the volume of the electrolyte bath rinsed with argon. As a result, the wire is formed nanocomposite coating thickness of 1-100 μm with evenly distributed over the volume of the matrix of the nanosized particles. Internal nanocomposite coating is applied before surgery plastic deformation on the steel tape on the similar technology.

As an example, note the measures proposed nanostructured cored wire can result in mechanized welding of plates of steel st3sp thickness of 4; 6 mm

As the basis for the manufacture of the shell of the wire used has a very mild cold-rolled steel tape thickness 0.4 mm width 10 mm of steel 08KP according to GOST 3560-73. The steel was placed in a rolling mill, comprising a rotating blocks with the profile surface. A mixture consisting of slag-forming, gas-forming, ionizing, the alloying components of the system: CaF2-Caso3-K2CO3-FeMn fell asleep in the deformable ribbon and formed a closed shell of circular cross section with a longitudinal seam edges with a diameter of 4.5 mm, Then the semi-finished product of the metal shell with the mixture was subjected to the repeated drawing through a system of carbide dies. The result was cored wire with a diameter of 1.6 mm After degreasing cored wire was placed in an electrolytic bath containing a colloidal solution of a copper-containing electrolyte and nano-sized particles of lithium fluoride LiF and yttrium oxide Y2O3. If the shutter speed wire within 5 minutes on the surface of the formed composite coating thickness of 10 μm, consisting of a copper matrix and nano-sized particles. Nanostructured cored wire was tested in mechanized welding in carbon dioxide plates of steel SP size of 150×300 mm thick 4; 6 mm with the use of semiautomatic PDG-312-4 source p is Tania EDC-303 and torch ESAB-PSF.

Studies drip transition produced when welding on a rotating tube with a camera "PCI 8000S Motion Scope" lens "Lens-18-108" with imaging frequency 2000 Hz, the light emitter of the lamp HBO-200V OSRAM and convex lens, see table 1. Mechanical testing of samples was performed on a tensile testing machine "Zwick SM ZO50/TH3S" with the help of the software TestXpert V 10.0", see table 2.

Thus, the proposed nanostructured cored wire provides a technical effect, which is reflected in the improvement drip transition and mechanical properties of welded joints can be made and applied using means known in the art, therefore, it has industrial applicability.

1. Flux cored wire for welding and surfacing consisting of a metal shell with a nanocomposite coating, made in the form of a metal matrix with distributed it with a mixture of nanoscale particles in the cavity where the mixture of slag-forming and gas-forming components, wherein the mixture further comprises ionizing and alloying components, and the nanocomposite coating includes nano-sized particles of metal fluoride, and rare earth metals in the following ratio of volumes Matri is s and nanoscale particles in the coating, %:

Metal matrix55-98
Nanosized particles of metal fluoride1-30
Nano-sized particles of rare-earth metals1-15

2. Flux cored wire under item 1, wherein the nanocomposite coating deposited on the outer and/or inner surface of the metal shell.



 

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1 tbl

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