CN115922148A - Metal flux-cored wire for laser cladding and preparation method and application thereof - Google Patents
Metal flux-cored wire for laser cladding and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a metal flux-cored wire for laser cladding, and a preparation method and application thereof, and belongs to the technical field of additive manufacturing. The metal wire for laser cladding is a flux-cored wire, belongs to a martensitic steel type material, and has high hardness and plastic toughness while having good corrosion resistance by adding alloy elements for improving the toughness, so that the metal wire can be prepared in a drawing mode, and the prepared cladding layer can meet the requirements of a hydraulic bracket on the service environment.
Description
Technical Field
The invention belongs to the technical field of new materials, and particularly relates to a metal flux-cored wire for laser cladding and a preparation method and application thereof.
Background
Coal is one of the most important energy sources for economic development, but due to the chemical properties of the coal, the coal has certain corrosivity, and at present, a high-corrosion mine is common mainly in northern Huaihe province, binxian province and other areas, and compared with northern Shaanxi province, inner Mongolia and other areas, the coal has less gas Cl - Geological environment of coal mine with low ion content is more complex, wherein Cl - HCO with the content of more than 1000mol/L 3 - SO4 with the content of more than 500mol/L 2- The content exceeds 3000mol/L, and the requirement on mechanical corrosion resistance degree is higher. In such coal mines, the safety and stability of the mechanical equipment used to mine coal determine the efficiency and cost of coal mining.
In coal mining equipment, the hydraulic support is one of the main units of coal mining production, however, high Cl - The complex environment of the coal mine is corroded, so that the surface of the hydraulic support equipment is easy to rust, and the production of the local coal mine is seriously influenced. The failure mode is deeply analyzed and is mainly found by the chlorine ions and H 2 Corrosion of S and wear of the coal particles, which combine to cause premature failure of highly corrosive mine hydraulic supports. Therefore, the failure of the high-corrosion mine hydraulic support to resist the two factors is a precondition for ensuring the service safety of the high-corrosion mine hydraulic support.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a metal flux-cored wire for laser cladding and a preparation method and application thereof so as to solve the problem that chloride ions and H are received in the prior art 2 S corrosion and coal particle abrasion, and the problem that a bracket in coal machine equipment is easy to corrode.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a metal flux-cored wire for laser cladding comprises a flux core and a welding skin, wherein the flux core is wrapped by the welding skin; the flux core is powdery, and the welding skin is stainless steel;
the metal flux-cored wire is used for preparing a cladding layer through laser cladding; the composition of the cladding layer is as follows by mass fraction: c:0.17-0.26%; si:0.31 to 0.43 percent; mn:0.95-1.21%; cr:20.18 to 21.67 percent; ni:1.53-2.08%; mo:1.64-2.31%; nb:1.03-1.68%; cu:0.90-1.32%.
The invention is further improved in that:
preferably, when the welding skin is 410 stainless steel, the flux core comprises the following components in percentage by mass:
c:0.50-0.90%; si:0.36-0.86%; mn:2.55 to 3.55 percent; cr:40.20 to 45.20 percent; ni:5.25 to 7.25 percent; mo:6.00-8.00%; nb:4.00-6.00%; cu:3.20 to 4.50 percent; the balance being Fe.
Preferably, when the welding skin is 430 stainless steel, the flux core comprises the following components in percentage by mass: c:0.50-0.90%, si:0.5-1.00%, mn:2.5-3.5%, cr:28.00-32.00%, ni:5.00-7.00%, mo:6.00-8.00%, nb:4.00-6.00%, cu:1.20-2.00%, and the balance of Fe.
Preferably, the filling rate of the flux core in the welding wire is 30-34wt.%.
Preferably, the diameter of the welding wire is 1.0-1.2mm.
The preparation method of the metal flux-cored wire for laser cladding comprises the following steps:
step 1, drying and mixing weighed and mixed raw materials;
and 2, placing raw materials in the stainless steel band, wrapping the raw materials by the stainless steel band, and drawing the stainless steel band wrapped with the raw materials for a plurality of times to form the welding wire with the size.
Preferably, in step 1, the raw materials are heated by a vacuum heating furnace and mixed by a mixer.
Preferably, in step 2, the stainless steel strip is cleaned by alcohol removal before use.
Preferably, the metal flux-cored wire is used for processing the surface of the hydraulic support of the coal mine through laser cladding, and a cladding layer is generated on the surface of the hydraulic support.
Preferably, the hardness of the cladding layer is HRC50, and the neutral salt spray corrosion resistance is more than 1000 hours.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a metal flux-cored wire for laser cladding, which comprises powder and a welding skin, wherein the powder is wrapped by the welding skin and consists of various metal components, so that the components of the powder can be adjusted according to the requirement of a cladding layer. Aiming at the main failure factors in the service environment of the hydraulic support in the coal mine: the invention relates to a method for resisting the abrasion failure of coal particles, which comprises the steps of carrying out chloride ion corrosion and coal particle abrasion, developing a targeted cladding layer component design, mainly aiming at high Cr content, resisting the corrosion of chloride ions, designing Mo and Nb combined solid solution strengthening, and resisting the abrasion failure of the coal particles by virtue of the multi-component composite strengthening effect. The formula of the powder is matched with a 430 stainless steel strip or a 410 stainless steel strip, and Nb and Mo elements are innovatively added on the basis of traditional Cr and Ni element solid solution strengthening, so that the powder has high hardness while the excellent corrosion resistance of a cladding layer is ensured. Furthermore, the flux-cored wire is designed aiming at laser cladding, compared with a solid wire, the flux-cored wire provided by the invention has the advantages that metal powder is adopted as a main raw material of powder, the melting efficiency of the wire can be obviously improved compared with the solid wire in the laser cladding manufacturing process, meanwhile, as the core part of the wire is powdery, the powdery material is easy to melt when the wire is melted by laser, the fluidity of a formed molten pool is good, the microstructure and chemical components of a finally formed cladding layer are uniform, the grain size is smaller than that of an electric arc cladding layer, the spraying is reduced, the smoke dust is less, the welding bead of the surface appearance is smooth, and the slag amount is less in the laser cladding process. The flux-cored wire provided by the invention is used for preparing a corrosion-resistant and high-hardness laser cladding layer by laser cladding, the formula of the powder is easy to obtain, the production efficiency of the wire is high, the cost is low, and the application prospect is wide. The welding wire can also be applied to conventional fusion welding methods such as TIG, MIG and the like.
The invention also discloses a preparation method of the metal flux-cored wire for laser cladding, which comprises the steps of firstly wrapping the raw material powder by the stainless steel strip, and drawing the stainless steel strip wrapped with the raw material powder into the metal flux-cored wire meeting the size requirement by drawing for a plurality of timesAnd (4) welding wires. The preparation method can prepare the product with the diameter of
The stainless steel metal wire material is used for carrying out laser cladding treatment on the surface of the hydraulic support oil cylinder. The stainless steel wire material has the characteristic of high hardness while ensuring excellent corrosion resistance through the optimization of the formula and the ratio.
The invention further discloses an application of the metal flux-cored wire for laser cladding, and the welding material meeting the service requirement of the hydraulic support is developed by deeply researching the service environment characteristics of the hydraulic support, designing a reasonable cladding layer alloy system based on the material components and the tissue composition of the hydraulic support and considering the characteristics of the laser cladding process. The wire laser cladding layer prepared by the metal flux-cored wire provided by the invention has high hardness and corrosion resistance, the coating hardness can reach HRC50 or so, the neutral salt spray corrosion (NSS) resistance is more than 1000 hours, and the surface is not corroded. H-resistance of laser cladding layer 2 And the corrosion degree of S is qualified by adopting a solution C method A of GB/T4157-2017 laboratory test method for resisting sulfide stress cracking and stress corrosion cracking of metal in a hydrogen sulfide environment. The invention adopts the wire material to match with the laser heat source to carry out surface modification of parts, and the laser heat source has the advantages of high efficiency, concentrated heat source and the like, so that the prepared cladding layer is compact, the crystal grains are fine and the tissue is uniform. The wire has simple preparation process, low cost and high efficiency. Therefore, the surface cladding layer is prepared by matching the wire with the laser heat source, the performance is good, the cost is low, and the market competitive advantage is obvious.
Drawings
Fig. 1 shows the microstructure of the cladding layer of the flux-cored wire prepared in example 2 of the present invention after laser cladding.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
One embodiment of the invention discloses a metal flux-cored wire for laser cladding, which is mainly used forThe surface of the hydraulic support is simultaneously provided with the preparation of a coating which is resistant to chloride ion corrosion and resistant to coal particle abrasion. The metal wire for laser cladding is a flux-cored wire, belongs to a martensitic steel type material, and has high hardness and plasticity and toughness while having good corrosion resistance by adding alloy elements for improving toughness, so that the metal wire can be prepared in a drawing mode. The metal flux-cored wire has the diameter of
The martensitic stainless steel laser cladding flux-cored wire.
The flux core is powdery metal powder, the specific components of the flux core can be adjusted according to requirements, the welding skin is made of stainless steel materials and can be common stainless steel belts such as a 410 stainless steel belt and a 430 stainless steel belt, and on the basis of the main technical concept of the invention, the technical personnel only change the components of the steel belts (for example, the 430 stainless steel belt is replaced by the 410 stainless steel belt) to cause the change of the components of the powder, but the invention still belongs to the protection scope of the invention when the chemical components are simultaneously subjected to multi-layer cladding by adopting the test method specified by the invention.
Specifically, when a 430 stainless steel strip is preferably adopted, the flux core comprises the following raw material components in percentage by mass:
C：0.50-0.90％；
Si：0.5-1.00％；
Mn：2.5-3.5％；
Cr：30.00-35.00％；
Ni：5.00-7.00％；
Mo：6.00-8.00％；
Nb：4.00-6.00％；
Cu：3.20-4.50％；
the balance being Fe.
The flux-cored wire has a flux powder filling rate of 30-34wt.%.
Specifically, when a 410 stainless steel band is preferably adopted, the flux core comprises the following raw material components in percentage by mass:
C：0.50-0.90％；
Si：0.36-0.86％；
Mn：2.55-3.55％；
Cr：40.20-45.20％；
Ni：5.25-7.25％；
Mo：6.00-8.00％；
Nb：4.00-6.00％；
Cu：3.20-4.50％；
the balance being Fe.
The flux-cored wire has the powder filling rate of 30-34wt.%.
According to the stainless steel 410 steel strip, the stainless steel 430 steel strip and the corresponding flux core components, the composition of the metal flux core is continuously adjusted along with the adjustment of the type of the welding skin, so that the component requirements of the cladding layer can be finally met.
The metal cladding layer prepared by the metal flux-cored wire comprises the following components:
C：0.17-0.26％
Si：0.31-0.43％；
Mn：0.95-1.21％；
Cr：20.18-21.67％；
Ni：1.53-2.08％；
Mo：1.64-2.31％；
Nb：1.03-1.68％；
Cu：0.90-1.32％；
according to the invention, the corrosion resistance of the material is ensured by reasonably blending the elements, the hardness of the material is improved, and the material has good plasticity and toughness, so that the wire material is convenient to prepare by drawing. Compared with the existing martensitic stainless steel, the stainless steel has excellent corrosion resistance and higher hardness, and ensures that a cladding layer is not cracked, and the main alloy elements in the formula of the metal wire material have the following functions:
chromium (Cr): with the increase of the amount of chromium in the stainless steel, the corrosion resistance of the stainless steel in an oxidizing acid medium is increased, and the corrosion resistance of the stainless steel in a chloride solution is also improved. In the high chromium content stainless steel, intermetallic compounds are easily formed in the steel under the influence of thermal stress, and not only ductility and toughness are reduced and corrosion resistance is reduced, but also cold formability and weldability are deteriorated. Chromium forms carbides with carbon in stainless steel, which reduces the corrosion resistance of the steel and causes intergranular corrosion, but if the amount of carbon is constant, the sensitivity to intergranular corrosion decreases as the amount of chromium in the steel increases. The chromium can obviously improve the high-temperature oxidation resistance, the sulfuration resistance and the high-temperature strength of the stainless steel. Although the chloride ion corrosion resistance of the cladding layer is closely related to the content of the Cr element, the Cr element is high, so that a large amount of ferrite structures exist in the cladding layer, and the hardness of the cladding layer cannot be greatly improved. Therefore, the target structure of the cladding layer of the invention is a martensitic stainless steel structure, and by matching 430 stainless steel bands and 30-34wt.% of filling rate, 28.00-32.00% of Cr element is added in the powder. The powder is mixed with 410 stainless steel band and 30-34wt.% of filling rate, and 36.20-40.20% of Cr element is added in the powder.
Nickel (Ni): nickel is the second most important alloying element in stainless steel than chromium. In order to resist the corrosion of reducing acid and alkali media, only chromium in the steel is insufficient, and nickel must be added into the steel, wherein the nickel can promote the stability of a stainless steel passive film and improve the thermodynamic stability of the stainless steel. Therefore, the coexistence of chromium and nickel in the stainless steel can significantly enhance the stainless steel's rust resistance and corrosion resistance. Nickel is beneficial to the high temperature oxidation resistance of stainless steel, but is detrimental to the high temperature sulfidation resistance. Since nickel reacts with sulfur to easily form low melting point sulfides, which significantly reduce the hot workability of the steel. Nickel can significantly improve the ductility and toughness of stainless steel and can shift the brittleness temperature of some stainless steels with brittle transition temperature downwards. Nickel may improve cold formability and weldability of some stainless steels and reduce the tendency of austenitic stainless steels to cold work harden. Nickel can significantly reduce the susceptibility of some stainless steels to precipitation of intermetallic compounds, thereby preventing and reducing their deleterious effects. In the invention, a 430 stainless steel strip and a filling rate of 30-34wt.% are matched, and 5.00-7.00% of Ni element is added into the medicinal powder. The powder is mixed with 410 stainless steel band and 30-34wt.% of filling rate, and 1.26-2.76% of Ni element is added into the powder.
Niobium (Nb): niobium is used as a stabilizing element for strongly forming carbon and nitrogen compounds in stainless steel, and is mainly used for preventing the corrosion resistance from being reduced due to the reduction of chromium concentration caused by the formation of chromium carbide by chromium and carbon in the steel, particularly causing intergranular corrosion; titanium may also combine with sulfur in the steel to form compounds to prevent pitting corrosion. According to the invention, the 430 stainless steel strip or the 410 stainless steel strip is matched with the filling rate of 30-34wt.%, and 4.00-6.00% of Nb element is added into the medicinal powder.
Molybdenum (Mo): molybdenum is also one of the important alloying elements in stainless steel. Studies have shown that in the marine atmosphere, in close proximity to chromium, it is difficult to achieve corrosion protection of stainless steel, and molybdenum must be added. However, the beneficial effect of molybdenum on the corrosion resistance of stainless steel presupposes that the steel must contain a sufficient amount of chromium, and the beneficial effect of molybdenum in the steel increases significantly with increasing amounts of chromium in the steel. Molybdenum can remarkably promote the enrichment of chromium in the passive film, thereby enhancing the stability of the passive film of the stainless steel, remarkably strengthening the corrosion resistance of chromium in the steel, and greatly improving the rust resistance of various stainless steels and the corrosion resistance of various reducing acid media. As the amount of molybdenum increases, the corrosion rate of the steel decreases and the corrosion resistance increases. Molybdenum in stainless steel improves the steel's ability to re-passivate, with about 3 times the resistance to pitting and crevice corrosion as compared to chromium. Molybdenum is also typically added to stainless steel to resist pitting and crevice corrosion. According to the invention, a 430 stainless steel strip or a 410 stainless steel strip is matched, the filling rate is 30-34wt.%, and 6.00-8.00% of Mo element is added into the powder.
Copper (Cu): the copper can improve the rust resistance and the corrosion resistance of the stainless steel, and particularly has more obvious effect in reducing media such as sulfuric acid and the like. When copper and molybdenum are added into steel in a composite way, the effect is better. Copper is dissolved in austenite in a solid solution mode, so that the stability of the super-cooled austenite is improved, the influence of the right shift of the C curve on the cooling transformation of the austenite is to improve the stability of the super-cooled austenite, reduce the initial temperature of the martensite transformation, and finally refine grains. The addition of a proper amount of copper to stainless steel can improve the Cl-corrosion resistance of the steel. This is related to the fact that copper can promote the enrichment of chromium in surface passivation films. Copper can significantly reduce the strength and cold work hardening tendency of stainless steel, improving the plasticity of the steel. Copper is an important element for remarkably improving the cold formability of various stainless steels. The diffusion precipitation of copper-rich epsilon intermetallic compounds is a main means for strengthening copper-containing precipitation-hardened stainless steel, and is also a cause of obtaining antibacterial properties of martensite, ferrite, and austenite stainless steel. As the copper content in steel increases, the thermoplastic properties of stainless steel decrease, thereby affecting the hot workability of the steel. In the invention, a 430 stainless steel strip or a 410 stainless steel strip is matched with a filling rate of 30-34wt.%, and 3.2-4.5% of Cu element is added into the medicinal powder.
Carbon (C): carbon is the most important alloy element in the traditional martensitic stainless steel, and the reasonable proportion of chromium and carbon in the steel shows the high, medium and low carbon martensitic stainless steel. The carbon acts to enlarge the austenite region and improve the hardenability of the steel. As the amount of carbon in the steel increases, the strength and hardness of the martensitic stainless steel increase, and the plasticity, toughness, corrosion resistance, cold formability, and weldability of the steel decrease. Carbon can improve the strength of the stainless steel, but obviously reduce the plasticity and toughness of the steel. Carbon combines with chromium in steel to form chromium-rich carbides at grain boundaries, causing chromium depletion and resulting in intergranular corrosion and reduced corrosion resistance. In the invention, the 430 stainless steel strip or the 410 stainless steel strip is matched with the packing rate of 30-34wt.%, and 0.5-0.90% of C element is added into the medicinal powder.
Silicon (Si) and manganese (Mn): si and Mn have combined deoxidation effect, can reduce the oxygen content in the cladding layer, prevent the generation of pores, and can improve the hardness of the cladding layer metal. However, since Mn is an austenite forming element, the content thereof should be controlled, and the addition of a large amount of Si deteriorates the ductility and toughness of the cladding layer and also needs to be controlled. According to the invention, a 430 stainless steel strip and a 30-35wt.% filling rate are matched, and 0.50-1.00% of Si element and 2.50-3.50% of Mn element are added into the powder. The powder is added with 0.87 to 1.11 percent of Si element and 2.55 to 3.55 percent of Mn element by matching 410 stainless steel bands and 30 to 32wt.% of filling rate.
The embodiment of the invention discloses a preparation method of a metal flux-cored wire for laser cladding, which comprises the following two steps:
step 1, determining the composition of a metal flux core according to the material type of a welding skin and the component content of a target cladding layer, weighing corresponding metal powder, mixing the weighed metal powder through a mixer or other mixing modes, and then drying in a vacuum heating furnace to remove moisture in the mixed metal powder;
and 2, placing mixed metal powder in the corresponding stainless steel welding skin, wrapping and fixing the mixed metal powder by the stainless steel welding skin to form a strip, drawing the strip to form a welding wire with a composite size requirement, and enabling the mixed metal powder in the stainless steel welding skin to be more compact through the drawing process.
The invention discloses application of a chloride ion-resistant high-hardness martensite laser-cladding flux-cored wire, and the metal flux-cored wire for laser cladding is used for preparing a flux-cored wire with a diameter
The laser cladding wire is used for carrying out laser cladding treatment on the surface of the hydraulic support oil cylinder.
According to the application of the chloride ion-resistant high-hardness martensite laser-cladding flux-cored wire, after laser cladding treatment is carried out on the surface of the hydraulic support oil cylinder, the surface hardness can reach 50HRC, the material has excellent chloride ion corrosion resistance, and when the neutral salt spray corrosion test is carried out under the condition of GBT10125 artificial atmosphere corrosion test salt spray test, the corrosion rating of the surface of the material after being corroded for 1000 hours can reach the highest grade of more than 9 according to the rating of samples and test pieces after corrosion tests of metals and other inorganic covering layers on GBT6461 metal substrates.
The following describes the effects of the present invention with reference to specific examples.
Example 1:
the ingredient formulation of the powder shown in example 1 is shown in table 1:
TABLE 1 formulation of the powder ingredients of example 1
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.5 | 1 | 2.5 | 30 | 5.0 | 6.0 | 6.0 | 3.2 | Bal. |
The powder formula of the embodiment 1 is adopted, the 430 stainless steel strip is matched for wrapping, the filling rate of the powder is controlled to be 30wt.%, and the flux-cored wire is prepared by drawing. The hardness of the obtained cladding layer is shown in table 2:
TABLE 2 surface hardness of the material of example 1
Example 1 the wire was clad in multiple layers (not less than 5 layers) by TIG welding, and the results of the evaluation in the laboratory test method for sulfide stress cracking and stress corrosion cracking resistance of GB/T4157 metal in hydrogen sulfide environment and the salt spray test of GB/T10125 Artificial atmosphere Corrosion test are shown in Table 3:
TABLE 3 neutral salt spray and H resistance of the cladding layer of the material of example 1 2 Results of S Corrosion test
Case 1 wire was clad with TIG welding in multiple layers (not less than 5 layers) with the metal components as shown in table 4:
TABLE 4 example 1 cladding of Metal compositions
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.18 | 0.42 | 0.97 | 20.18 | 1.55 | 1.64 | 1.65 | 0.9 | Bal. |
Example 2:
the ingredient formulation of the powder shown in example 2 is shown in table 5:
TABLE 5 formulation of powder ingredients of example 2
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.9 | 0.5 | 3.5 | 35.0 | 6.3 | 7.0 | 4.0 | 4.5 | Bal. |
The powder formula of example 2 is adopted, and a 430 stainless steel strip is matched for wrapping, the filling rate of the powder is controlled to be 34wt.%, and the flux-cored wire is prepared by drawing. The hardness of the obtained cladding layer is shown in table 6:
TABLE 6 surface hardness of the material of example 2
Example 2 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the laboratory test method for sulfide stress cracking and stress corrosion cracking resistance of GB/T4157 metal in hydrogen sulfide environment and the salt spray test of GB/T10125 Artificial atmosphere Corrosion test were shown in Table 7:
TABLE 7 neutral salt spray and H resistance of the cladding layer of the material of example 2 2 Results of S Corrosion test
Case 2 wire materials were clad with TIG welding in multiple layers (not less than 5 layers) with metal components as shown in table 8:
TABLE 8 example 2 cladding Metal composition
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.26 | 0.32 | 1.21 | 21.59 | 1.78 | 1.93 | 1.07 | 1.31 | Bal. |
Example 3:
the ingredient formulation of the powder shown in example 3 is shown in table 9:
TABLE 9 formulation of powder ingredients of example 3
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.7 | 0.7 | 2.9 | 31.5 | 7 | 8 | 5.0 | 3.8 | Bal. |
The powder formula in example 3 is adopted, and is matched with a 430 stainless steel strip for wrapping, the filling rate of the powder is controlled at 32wt.%, and the flux-cored wire is prepared by drawing. The hardness of the obtained cladding layer by using the flux-cored wire for laser cladding is shown in table 10:
TABLE 10 surface hardness of the material of example 3
Example 3 the wire was clad in layers (not less than 5 layers) by TIG welding, and the results of the evaluation of the laboratory test method for resisting sulfide stress cracking and stress corrosion cracking in a hydrogen sulfide environment of GB/T4157 metal and the salt spray test of the artificial atmosphere corrosion test of GB/T10125 are shown in Table 11:
TABLE 11 neutral salt spray and H resistance of the cladding layer of the material of example 3 2 Results of S Corrosion test
Case 3 wire materials were clad with TIG welding in multiple layers (not less than 5 layers) with metal components as shown in table 12:
TABLE 12 example 3 cladding of Metal compositions
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.21 | 0.37 | 1.12 | 20.89 | 2.04 | 2.31 | 1.42 | 1.20 | Bal. |
The laser cladding layer prepared in example 3 had a structure as shown in fig. 1: the cladding layer is mainly composed of cellular dendrites, the structure is a martensite structure, and the structure is uniformly distributed.
Example 4
The ingredient formulation of the powder shown in example 4 is shown in table 13:
ingredient formula of medicine powder in Table 13
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.8 | 0.8 | 3.0 | 33 | 6.5 | 7.5 | 4.5 | 4 | Bal. |
The powder formula of example 4 is adopted, and a 430 stainless steel strip is matched for wrapping, the filling rate of the powder is controlled at 32wt.%, and the flux-cored wire is prepared by drawing. The hardness of the obtained cladding layer by using the flux-cored wire for laser cladding is shown in table 14:
TABLE 14 surface hardness of the material of example 4
Example 4 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the laboratory test method for sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environment using GB/T4157 metal and the salt spray test for GB/T10125 Artificial atmosphere Corrosion test are shown in Table 11:
TABLE 15 neutral salt spray and H resistance of the cladding layer of the material of example 4 2 Results of S Corrosion test
Example 4 wire was clad with TIG welding in multiple layers (not less than 5 layers) with metal compositions as shown in table 16:
TABLE 16 example 3 cladding Metal composition
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.24 | 0.33 | 1.15 | 20.5 | 1.8 | 1.8 | 1.2 | 1 | Bal. |
Example 5:
the ingredient formulation of the powder shown in example 5 is shown in table 17:
TABLE 17 formulation of powder components of example 5
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.5 | 0.86 | 2.55 | 45.2 | 5.25 | 6.0 | 4.0 | 4.5 | Bal. |
The powder formula of example 5 is adopted, 410 stainless steel strips are matched for wrapping, the filling rate of the powder is controlled at 30wt.%, and the flux-cored wire is prepared by drawing. The hardness of the obtained cladding layer by using the flux-cored wire for laser cladding is shown in table 18:
TABLE 18 surface hardness of the material of example 5
Example 5 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the laboratory test method for sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environment using GB/T4157 metal and the salt spray test for GB/T10125 Artificial atmosphere Corrosion test were shown in Table 19:
TABLE 19 neutral salt spray and H resistance of the material of example 5 cladding 2 Results of S Corrosion test
Example 5 wire was clad with TIG welding in multiple layers (not less than 5 layers) with metal compositions as shown in table 20:
TABLE 20 cladding Metal compositions of example 5
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.17 | 0.43 | 0.95 | 21.67 | 1.53 | 1.64 | 1.03 | 1.32 | Bal. |
Example 6:
the ingredient formulation of the powder shown in example 6 is shown in table 21:
TABLE 21 formulation of powder ingredients of EXAMPLE 6
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.9 | 0.36 | 3.55 | 43.5 | 7.25 | 7.0 | 6.0 | 3.8 | Bal. |
The flux-cored wire is prepared by adopting the formula of the powder in the embodiment 6, wrapping the powder by matching with a 410 stainless steel strip, controlling the filling rate of the powder at 34wt.%, and drawing. The hardness of the obtained cladding layer by using the flux-cored wire for laser cladding is shown in table 22:
TABLE 22 surface hardness of the material of example 6
Example 6 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the laboratory test method for sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environment using GB/T4157 metal and the salt spray test for GB/T10125 Artificial atmosphere Corrosion test are shown in Table 23:
TABLE 23 neutral salt spray and H resistance of the cladding layer of the material of example 6 2 Results of S Corrosion test
Example 6 wire multilayer cladding (not less than 5 layers) with TIG welding metal composition is shown in table 24:
TABLE 24 cladding Metal compositions of example 6
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.26 | 0.31 | 1.18 | 20.89 | 2.08 | 1.98 | 1.68 | 1.17 | Bal. |
Example 7:
the ingredient formulation of the powder shown in example 7 is shown in table 25:
TABLE 25 formulation of powder ingredients of example 7
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.68 | 0.58 | 3.0 | 40.2 | 6.1 | 8 | 5.0 | 3.2 | Bal. |
The powder formulation of example 7 was used in combination with 410 stainless steel bands for wrapping, the powder fill rate was controlled at 32wt.%, and flux-cored wire was prepared by drawing. The hardness of the obtained cladding layer by using the flux-cored wire for laser cladding is shown in table 26:
TABLE 26 surface hardness of the material of example 7
Example 7 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the evaluation by the laboratory test method for sulfide stress cracking and stress corrosion cracking in a hydrogen sulfide atmosphere using GB/T4157 Metal and the salt spray test in the GB/T10125 Artificial atmosphere Corrosion test are shown in Table 27:
TABLE 28 neutral salt spray and H resistance of the cladding layer of the material of example 7 2 Results of S Corrosion test
Example 7 wire multilayer cladding (not less than 5 layers) by TIG welding metal composition is shown in Table 29:
TABLE 29 example 7 cladding Metal composition
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.19 | 0.36 | 1.13 | 20.2 | 1.78 | 2.28 | 1.43 | 0.93 | Bal. |
Example 8:
the ingredient formulation of the powder shown in example 8 is shown in table 29:
TABLE 29 formulation of powdered ingredient of example 8
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.6 | 0.75 | 3.2 | 42 | 6.5 | 6.5 | 4.5 | 3.7 | Bal. |
The flux-cored wire is prepared by adopting the formula of the powder in the embodiment 8, wrapping the powder by matching with a 410 stainless steel strip, controlling the filling rate of the powder at 32wt.%, and drawing. The hardness of the obtained cladding layer by adopting the flux-cored wire for laser cladding is shown in table 30:
TABLE 30 surface hardness of the material of example 8
Example 8 wire materials were multilayer clad by TIG welding (not less than 5 layers), and the results of the laboratory test method for sulfide stress cracking and stress corrosion cracking in hydrogen sulfide environment using GB/T4157 metal and the salt spray test for GB/T10125 Artificial atmosphere Corrosion test are shown in Table 31:
TABLE 31 neutral salt spray and H resistance of the cladding layer of the material of example 8 2 Results of S Corrosion test
Example 8 wire was clad with TIG welding in multiple layers (not less than 5 layers) with metal compositions as shown in table 32:
TABLE 32 example 8 cladding Metal composition
| C | Si | Mn | Cr | Ni | Mo | Nb | Cu | Fe |
| 0.22 | 0.35 | 1.01 | 20.5 | 1.65 | 1.75 | 1.35 | 1.25 | Bal. |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The metal flux-cored wire for laser cladding is characterized by comprising a flux core and a welding skin, wherein the flux core is wrapped by the welding skin; the flux core is powdery, and the welding skin is stainless steel;
the metal flux-cored wire is used for preparing a cladding layer through laser cladding; the composition of the cladding layer is as follows by mass fraction: c:0.17-0.26%; si:0.31 to 0.43 percent; mn:0.95-1.21%; cr:20.18 to 21.67 percent; ni:1.53-2.08%; mo:1.64 to 2.31 percent; nb:1.03 to 1.68 percent; cu:0.90-1.32%.
2. The metal flux-cored wire for laser cladding of claim 1, wherein when the weld skin is 410 stainless steel, the flux core comprises the following components in percentage by mass:
c:0.50 to 0.90 percent; si:0.36-0.86%; mn:2.55 to 3.55 percent; cr:40.20 to 45.20 percent; ni:5.25 to 7.25 percent; mo:6.00-8.00%; nb:4.00-6.00%; cu:3.20 to 4.50 percent; the balance being Fe.
3. The metal flux-cored wire for laser cladding of claim 1, wherein when the weld skin is 430 stainless steel, the flux core comprises the following components in percentage by mass: c:0.50-0.90%, si:0.5-1.00%, mn:2.5-3.5%, cr:28.00-32.00%, ni:5.00-7.00%, mo:6.00-8.00%, nb:4.00-6.00%, cu:1.20-2.00%, and the balance of Fe.
4. The metal cored wire for laser cladding as claimed in claim 1, wherein the filling rate of the core in the wire is 30-34wt.%.
5. The metal flux-cored wire for laser cladding of claim 1, wherein the diameter of the wire is 1.0-1.2mm.
6. The preparation method of the metal flux-cored wire for laser cladding as set forth in claim 1, which comprises the following steps:
step 1, drying and mixing the weighed and mixed raw materials;
and 2, placing raw materials in the stainless steel band, wrapping the raw materials by the stainless steel band, and drawing the stainless steel band wrapped with the raw materials for a plurality of times to form the welding wire with the size.
7. The method for preparing a metal flux-cored wire for laser cladding as claimed in claim 6, wherein in step 1, the raw materials are heated by a vacuum heating furnace and mixed by a blender mixer.
8. The method for preparing the metal flux-cored wire for laser cladding as claimed in claim 6, wherein in the step 2, the stainless steel strip is cleaned by alcohol removal before use.
9. The application of the metal flux-cored wire for laser cladding as claimed in claim 1, wherein the metal flux-cored wire is used for processing the surface of a hydraulic support of a coal mine through laser cladding to generate a cladding layer on the surface of the hydraulic support.
10. The use of the metal flux-cored wire for laser cladding as claimed in claim 9, wherein the hardness of the cladding layer is HRC50 and the neutral salt spray corrosion resistance is greater than 1000 hours.
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