CN105603355A - Method for achieving steel surface nitrogen increment through nitrogen arc and nitride in-situ metallurgy - Google Patents
Method for achieving steel surface nitrogen increment through nitrogen arc and nitride in-situ metallurgy Download PDFInfo
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- CN105603355A CN105603355A CN201610005690.9A CN201610005690A CN105603355A CN 105603355 A CN105603355 A CN 105603355A CN 201610005690 A CN201610005690 A CN 201610005690A CN 105603355 A CN105603355 A CN 105603355A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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Abstract
The invention belongs to the field of material surface treatment, and particularly discloses a method for achieving steel surface rapid high-nitrogen tempering through the nitrogen arc and nitride in-situ metallurgy nitrogen increment technology. The method comprises the steps that nitride alloy powder and iron powder are mixed to be uniform through a bi-pass coaxial spiral gas powder cover, heated through a nitrogen arc and fed to the surface of a steel base material to be treated, meanwhile, nitride alloy powder, iron powder and some of the base material are heated and molten through the nitrogen arc, a molten pool is stirred through electric arc electromagnetic stirring and welding gun swing, alloy elements in the molten pool and molten base material are sufficiently molten and mixed, the molten pool is cooled and solidified, and therefore a high-nitrogen steel layer can be formed on the steel surface. The treated high-nitrogen steel layer is high in nitrogen content which is far larger than the largest nitrogen content obtained through conventional surface nitrogen increment treatment. The high-nitrogen steel layer with different ingredients and properties can be obtained through real-time adjustment in the nitrogen increment process.
Description
Technical field
The present invention relates to material surface process field, be specially the metallurgical nitrogen pick-up of a kind of employing nitrogen arc and nitride in-situ and realize steelThe devices and methods therefor of the quick high nitrogen tempering in surface.
Background technology
Conventional surperficial increasing method for nitrogen has gas nitriding and glow discharge nitriding.
Gas nitriding can adopt general nitriding process (being single stage nitriding) or multistage (two sections, three sections) nitriding process. The former isIn whole nitriding process, nitriding temperature and ammonia decomposition remain unchanged. Temperature generally between 480～520 DEG C, ammoniaResolution ratio is 15～30%, nearly 80 hours of temperature retention time. This technique is applicable to that infiltration layer is shallow, distortion requires tight, hardnessRequire high part, but the processing time is long. Multiple stage nitriding is to adopt respectively not by different phase in whole nitriding processSynthermal, different ammonia dissociation rates, different time carry out nitriding and diffusion. Whole nitriding time can shorten to nearly 50 littleTime, can obtain darker infiltration layer, but nitriding temperature is higher like this, distorts larger.
Glow discharge nitriding utilizes glow discharge principle to carry out. Compared with general gas nitriding, glow discharge nitriding is characterized in:1. can suitably shorten the nitriding cycle; 2. nitriding layer fragility is little; 3. can save the consumption of the energy and ammonia; 4. ooze not needingThe part maskable of nitrogen gets up, and realizes selective nitriding; 5. Ions Bombardment has purification surface action, can remove surface of the work bluntChange film, can make stainless steel, the direct nitriding of heat resisting steel workpiece; 6. alloying layer thickness and tissue can be controlled. But its equipment controlSystem is complicated, and the uniformity of furnace temperature is bad.
In summary, these conventional two kinds of nitriding methods, before nitriding, needing the modified and conditioning treatment of conditioning treatment to go shouldPower processing, the surface roughness Ra of the part of nitriding simultaneously should be less than 1.6um etc. restriction. The cycle of nitriding treatment processLong, nitriding layer is thin, temperature control requirement is tight, to the surface preparation of part require strictly, equipment control complexity. Two kindsGas nitriding process all need to carry out in airtight environment, and length consuming time, and nitriding layer is thin, nitrogen increased amount is low, nitrogen pick-up layer becomesDivide non-adjustable.
For other process for treating surface, as traditional thermal spraying, surfacing and built-up welding also can be used for nitrogen pick-up place of material surfaceReason. Thermal spraying on surface nitrogen pick-up is owned by France in nitride ceramics spraying technology, is not metallurgical binding, and hot spray process is to base simultaneouslyThe pretreatment on material surface requires higher, need to carry out roughening treatment, and requires higher to the particle diameter of spray coating powder.
Traditional spray welding technology can make powder or welding wire, can form metallurgical binding with mother metal, but the dilution of spray-welding coatingRate is high, general approximately 5%～10%, and needs the pre-heat treatment, and the fusing point of spray material requires lower than matrix fusing point, meanwhile,In surfacing process, the composition of the high nitrogen layer of surfacing is non-adjustable. Welding wire is generally used in built-up welding, and overlay cladding composition can only be welding wireComposition, overlay cladding composition can not design, and with overlaying method, nitrogen pick-up processing is carried out in steel surface, the nitrogen pick-up layer obtainingComposition can not design.
Chinese patent (201310398151.2) discloses a kind of use high velocity oxy-fuel thermal spray and plasma nitriding is used forThe method and system of mould compensation and reparation. The nitrogen pick-up composition of layer obtaining can not design, thin thickness, and alloy powderParticle diameter requires strict. Chinese patent (201110309131.4) relates to a kind of reaction of manufacturing again reparation based on partNitrogen arc fusing and coating wear-resistant coating preparation technology. The slurry of modulation is coated in after piece surface oven dry, deposited with nitrogen arc, slurryIn nonnitrogenous element, only depend on nitrogen arc nitrogen pick-up DeGrain, and dry need the time, if not completely dry may drawPlay hydrogen induced cracking. And the present invention is directly laid on nitride alloy powder on pending steel surface, adopt nitrogen arc original positionMetallurgy, does not need to increase stoving process, and has adopted nitride and nitrogen arc associating nitrogen pick-up technology, nitrogen pick-up successful and consumptionTime short. Chinese patent (201310650075.X) discloses a kind of side that adds nitrogen smelting nitrogen containing metal material with plasma arcMethod, is specially and fills high pressure nitrogen condition plasma arc by vacuum purification and add nitrogen melting steel billet, need to add vacuum, preparationCondition harshness, and final nitrogen increased amount is low.
Summary of the invention
The object of the present invention is to provide a kind of device that adopts nitrogen arc and nitride in-situ metallurgy to realize steel surface nitrogen pick-upAnd method.
Adopt nitrogen arc and nitride in-situ metallurgy to realize a device for steel surface nitrogen pick-up, comprising:
One non-consumable gas shielded arc welding rifle;
A pair of is colluded axle gas powder conveyer, in it, is provided with non-consumable gas shielded arc welding rifle with axial screw gas powder cover,In spiral gas powder cover, have the screw thread being fastenedly connected with non-consumable gas shielded arc welding rifle;
The coaxial conveyer of gas powder is interior, spiral gas powder cover is provided with two powder feedings tangent with spiral gas powder cover outer wall outward and supplies gas logicalRoad;
Described powder feeding plenum duct has air taking port and powder feeding mouth; The inwall of described spiral gas powder cover has spiralGas powder groove.
Spiral gas powder groove is for becoming helical-varying pitch-variable section structure, and spiral gas powder groove comprises double spiral groove, the single spiral shell in heavy in sectionSpin slot, small bore single helical groove, described groove is half slot; Spiral gas powder groove top is two near gas powder feeder connection placeThe double spiral groove of helical structure, groove diameter is 4mm～7mm, and described double-spiral structure has three circles at least;
Two double spiral grooves that gas powder channel connection two is adjacent;
What be connected with double spiral groove is heavy in section single helical groove, and groove diameter is 7mm～12mm; Groove width increases to ensure nitrogenCompound alloy powder fully mixes with iron powder, and what be connected with heavy in section single helical groove is small bore single helical groove, and groove is straightFootpath is 4mm～7mm.
From the top to the bottom, its lead angle is tending towards the straight angle to spiral gas powder groove gradually, spiral gas powder groove lead angle be 0 °～60 °; Spiral gas powder groove is 0 °～5 ° at the lead angle of spiral gas powder cover outlet.
Spiral gas powder cover adopts heat proof material SiC pottery to manufacture.
On powder feeding mouth as above and air taking port, powder feeding speed regulator and gas flowmeter are housed respectively.
The gas powder outlet of spiral gas powder cover as above is necking down shape, and the extended line of necking down face points to arc center.
Heat-barrier material parcel is manufactured with SiC pottery in non-consumable gas shielded arc welding rifle as above outside, and described is non-moltenChange utmost point gas protective welding gun, the reach of its outer upper processing is at least the twice of its diameter.
The present invention also provides a kind of method that adopts nitrogen arc and nitride in-situ metallurgy to realize the nitrogen pick-up of steel surface, comprise step asUnder:
Step 1, by the target alloying component of the high nitrogen steel of target layer, determines iron content WFe%; Determine iron powder workIt is the first powder feeding raw material of supplying gas powder feeding passage;
According to the target alloying component of the high nitrogen steel of target layer, determine the second powder feeding raw material of supplying gas powder feeding passage, alloy powderThe content Wif% ratio of middle alloying element i, through revising relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) obtains powder after revisingThe correction value Wif of alloying element i content in endRevise%; Wherein μ i is scaling loss coefficient, μ i=0.2%～5%, and ξ is scatteringSpatter loss coefficient, ξ=2%～8%; The described second alloy of supplying gas in the alloy powder of powder feeding raw material of powder feeding passageElement i is not iron.
Step 2, according to the content Wi% of the alloying element i except ferro element in the high nitrogen steel of target and iron contentRelational expressionObtain all alloying elements with the composition of ferro element than α: β; Determine and send into molten bathAlloy powder quality mAlloy powderQuality m with iron powderIron powderThan for α: β, establish the alloy powder quality entering in molten bathmAlloy powder=Vf × Δ t, establishes the iron powder quality m that enters molten bathIron powder＝VFe× Δ t, wherein Vf is alloy powder powder feeding rate,Unit is g/min; VFeFor adding iron powder speed, unit is g/min; Δ t is the time, and unit is min;
Step 3, according to formula mAlloy powder:mIron powder＝(Vf×Δt):(VFe× Δ t)=α: β, determine alloy powder powder feeding rateVf and interpolation iron powder speed VFeParameter matching relation, Vf:VFe＝α:β；
Step 4, choosing suitable welding current size I is 80A～200A; Choose and add iron powder speed VFeFor20g/min～150g/min; By formula Vf:VFe=α: β, determines alloy powder powder feeding rate Vf;
Step 5, starts welder, and the surface distance 8-15mm of the required processing steel that adjustment welding gun arrives, adopts weldingElectric current I, alloy powder powder feeding rate Vf, the speed of supplying gas is VGas 1, add iron powder speed VFe, the speed of supplying gas is VGas 2，At non-consumable gas shielded arc welding rifle by 10%Ar and 90%N2Gaseous mixture, regulating its speed is VGas 3, weld,In-situ metallurgical nitrogen pick-up processing is carried out in steel surface.
Further, bonding speed v is 3～16mm/min.
Further, the speed of supplying gas is VGas 1, the speed of supplying gas is VGas 2; The speed of supplying gas is VGas 3, meetVGas 1≈VGas 2≈VGas 3＝15～40L/min。
The present invention compared with prior art has following remarkable advantage:
1, method provided by the invention can realize steel surface nitrogen pick-up high nitrogen tempering, the nitrogen pick-up layer of acquisition at short noticeThickness can reach several millimeters of even Centimeter Level, and nitrogen pick-up composition of layer can design;
2, device provided by the invention is double helix at bilateral coaxial spiral gas powder cover near the helicla flute at gas powder passway placeStructure, can effectively prevent powder blocking channel mouth; Heavy in section, middle part single coil configuration groove contributes to the abundant of two kinds of gas powder streamsMix; Varying pitch, change lead angle contribute to the even mixing of gas powder stream.
3, method provided by the invention has not only realized steel surface nitrogen pick-up effect, can also add other useful alloying elements,Realize the high nitrogen tempering in steel surface, the nitrogen pick-up layer obtaining has good high strength anti-corrosion performance. The nitrogen pick-up layer and the base steel that obtainBetween body, be metallurgical binding, bond strength is high.
4, the present invention adopts nitrogen arc and nitride alloy associating in-situ metallurgical nitrogen pick-up technology, simple to operate, can be by adjustingCurrent size and welding gun translational speed flexible modulation nitrogen pick-up layer thickness. To not needing the place of nitrogen pick-up also not need to take protectionMeasure, can realize local nitrogen pick-up.
Brief description of the drawings
Fig. 1 is the schematic diagram that nitrogen arc and nitride in-situ metallurgy are realized steel surface nitrogen pick-up device;
Fig. 2 is the longitudinal sectional view of bilateral coaxial spiral gas powder cover;
Fig. 3 is the cutaway view that nitrogen arc and nitride in-situ metallurgy are realized the section A-A of steel surface nitrogen pick-up device;
Wherein, 1 is the first air taking port, 2 first powder feeding mouths, and 3 is bilateral coaxial spiral gas powder cover, 4 second air taking ports,5 is the second powder feeding mouth, and 6 is spiral gas powder groove, and 7 is non-consumable gas shielded arc welding rifle;
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, one of the present invention is adopted to nitrogen arc and nitride composite in-situ metallurgyThe method that realizes steel surface nitrogen pick-up further describes.
The present invention adopts nitrogen arc and nitride in-situ metallurgy to realize the device of steel surface nitrogen pick-up, comprising:
One non-consumable gas shielded arc welding rifle 7;
A pair of is colluded axle conveyer, in it, is provided with non-consumable gas shielded arc welding rifle 3 with axial screw gas powder cover 3,In spiral gas powder cover 3, have the screw thread being fastenedly connected with non-consumable gas shielded arc welding rifle 7;
In the coaxial conveyer of bilateral gas powder, outer being provided with tangent two of spiral gas powder cover 3 outer walls of spiral gas powder cover 3 givePowder plenum duct, is respectively first powder feeding passage and the second powder feeding passage of supplying gas of supplying gas;
The first powder feeding passage of supplying gas has the first air taking port 1 and the first powder feeding mouth 2; Second supplies gas powder feeding passage respectivelyHave the second air taking port 3 and the second powder feeding mouth 4;
The inwall of spiral gas powder cover 3 has spiral gas powder groove 6.
Spiral gas powder groove 6 is for becoming helical-varying pitch-variable section structure, and spiral gas powder groove 6 comprises double spiral groove, heavy in sectionSingle helical groove, small bore single helical groove, groove is half slot; Spiral gas powder groove 6 tops are two near gas powder feeder connection placeThe double spiral groove of helical structure, groove diameter is 4mm～7mm, and double-spiral structure has three circles at least;
Two double spiral groove places that gas powder channel connection two is adjacent;
What be connected with double spiral groove is heavy in section single helical groove, and groove diameter is 7mm～12mm; With heavy in section single helical grooveWhat be connected is small bore single helical groove, and groove diameter is 4mm～7mm.
From the top to the bottom, its lead angle is tending towards the straight angle to spiral gas powder groove 6 gradually, and spiral gas powder groove 6 lead angles are0 °～60 °; The lead angle that spiral gas powder groove 6 exports at spiral gas powder cover 3 is 0 °～5 °.
Spiral gas powder cover 3 adopts heat proof material SiC pottery to manufacture.
Powder feeding speed regulator and gas flowmeter are housed on powder feeding mouth and air taking port respectively.
The gas powder outlet of spiral gas powder cover 3 is necking down shape, and the extended line of necking down face points to arc center.
Heat-barrier material parcel, described non-melt pole gas are manufactured with SiC pottery in described non-consumable gas shielded arc welding rifle 7 outsidesBody protection welding gun 7, the reach of its outer upper processing is at least the twice of its diameter.
Nitrogen arc of the present invention is blanket of nitrogen electric arc, comprises electric arc and plasma arc; Nitride alloy powder and iron powder are passed throughThe coaxial gas powder of bilateral cover mixes, and after nitrogen arc heating, delivers on pending steel mother metal surface, heats with nitrogen arc simultaneouslyFusing nitride alloy powder, iron powder and part mother metal, carry out molten bath by the electromagnetic agitation of electric arc and the swing of welding gunStir, the alloying element in molten bath is mixed with the abundant melting of mother metal of fusing, molten bath cooled and solidified can be steel surface shapeBecome high nitrogen steel layer. By the parameter matching of control surface processing, can obtain the high nitrogen steel table of different nitrogen contents, different-thicknessFace.
The nitrogen pick-up principle adopting, on the one hand, nitride alloy powder, iron powder and part steel mother metal heat fused in nitrogen arc,Nitrogen in nitrogen arc enters molten bath, has improved the nitrogen content in molten bath, and in nitrogen arc, nitrogen partial pressure is higher simultaneously, can control molten bathIn fused into nitrogen effusion; On the other hand, in nitride alloy powder, contain a large amount of nitrogen elements, in nitrogen arc heating processIn also fused in molten bath, further improved the nitrogen content in molten bath. Meanwhile, in nitride alloy powder, be also furnished with and containJust like the alloying element of Cr, Mn, Mo etc., to guarantee that nitrogen element is solid-solubilized in the high nitrogen steel layer being formed with atomic form.
Embodiment 1
Utilize device as shown in Figure 1, adopt nitrogen arc and nitride in-situ metallurgy to realize the method for steel surface nitrogen pick-up,Q235B steel surface obtains the high nitrogen steel layer that thickness is 2mm. The target component of high nitrogen steel layer is as shown in table 1.
The chemical composition of the high nitrogen steel of table 1 target layer requires (%)
| Chemical composition | N | Mn | Cr | Mo | Si | C | Fe |
| Standard criterion | 0.8-2.4 | 12-18 | 18-23 | 1.0-2.5 | ≤1 | ≤0.1 | Surplus |
Adopt employing nitrogen arc of the present invention and nitride in-situ metallurgy to realize the method for steel surface nitrogen pick-up, its concrete stepsFor:
Step 1, by the target alloying component of the high nitrogen steel of target layer, determines iron content WFe%; Determine iron powder workIt is the first powder feeding raw material of supplying gas powder feeding passage;
According to the target alloying component of the high nitrogen steel part of target, determine that alloy powder is that second the supply gas powder feeding of powder feeding passage is formerMaterial, determines the required content Wif% ratio as alloying element i in the nitride alloy powder of powder feeding raw material, through revisingRelational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) obtains the correction value of alloying element i content in powder after revisingWifRevise%, and prepare nitride alloy powder; Wherein μ i is scaling loss coefficient, μ i=0.2%～5%, and ξ is that scattering is splashedLoss coefficient, ξ=2%～8%;
Nitride alloy powder stock comprises: chromium nitride powder, nitrogenized manganese powder, chromium powder, manganese powder, molybdenum powder etc.
In the time that powder is pressed CrN:MnN:Cr:Mn:Mo=4:4:18.85:11.8:1.5, meet high nitrogen steel layer target componentContent ratio. According to revising relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ), the formula that correction obtains material powder is:When CrN:MnN:Cr:Mn:Mo=4:4:19:12:1.5, be used in conjunction with and can make Q235B steel surface obtain with iron powderHigh nitrogen steel layer, and the theoretical composition of high nitrogen steel layer is N:1.66%, Mn:15%, Cr:22%, Mo:1.5%, surplus is iron.
Step 2, according to the content Wi% of the alloying element i except ferro element in the high nitrogen steel of target and iron contentRelational expressionThe composition that obtains all alloying elements and ferro element is than α: β ≈ 2:3; Determine and send intoThe alloy powder quality m in molten bathAlloy powderQuality m with iron powderIron powderThan for 2:3, enter the alloy powder quality in molten bathmAlloy powder=Vf × Δ t, enters the iron powder quality m in molten bathIron powder＝VFe× Δ t, wherein Vf is interpolation alloy powder speed,Unit is g/min; VFeFor adding iron powder speed, unit is g/min; Δ t is the time, and unit is min.
Step 3, according to formula mAlloy powder:mIron powder＝(Vf×Δt):(VFe× Δ t)=α: β, determine and add alloy powder speedVf and interpolation iron powder speed VFeParameter matching relation, Vf:VFe＝2:3。
Step 4, chooses suitable electric current I=120A; Choose suitable interpolation iron powder speed VFe=75g/min; Secondly,By formula Vf:VFe=α: β, draws and adds alloy powder speed Vf=52g/min; Bonding speed v generally gets8mm/min. In addition, the logical nitrogen powder feeding of powder feeding passage of supplying gas of first on the coaxial gas powder of bilateral conveyer, its speed of supplying gasRate is VGas 1; The second logical nitrogen powder feeding of powder feeding passage of supplying gas, its speed of supplying gas is VGas 2; The logical 10%Ar+N2 of welding gun mixesGas, its speed is VGas 3, meet VGas 1≈VGas 2≈VGas 3＝20L/min。
Step 5, starts the device that utilizes nitrogen arc and nitride in-situ metallurgy to realize steel surface nitrogen pick-up provided by the invention, adoptsWith the speed of supplying gas on the coaxial gas powder of bilateral conveyer be VGas 1, the speed of supplying gas is VGas 2, and the logical 10%Ar+N2 of welding gunGaseous mixture speed is VGas 3, meet VGas 1≈VGas 2≈VGas 3=20L/min, regulates passage two to add nitride alloy powder speedRate Vf=52g/min, passage one add iron powder speed VFe=75g/min, welds, and original position is carried out in steel surfaceMetallurgical nitrogen pick-up processing.
On Q235B steel surface, carry out built-up welding with speed v=58.3cm/min deposited, finally obtain on Q235B steel surfaceThe thickness high nitrogen steel layer that is 2mm.
Claims (7)
1. adopt nitrogen arc and nitride in-situ metallurgy to realize a method for steel surface nitrogen pick-up, it is characterized in that, comprise stepRapid as follows:
Step 1, according to the alloying component of the high nitrogen steel part of target, obtain alloying element i with the composition of ferro element than α: β,Determine the quality of alloy powder and the mass ratio of iron powder of sending into molten bath;
Step 2, according to the mass ratio of the quality of alloy powder and iron powder, determines alloy powder powder feeding rate Vf and adds ironPowder speed VFeMatching relationship formula Vf:VFe=α: β; Wherein, Vf is alloy powder powder feeding rate, and unit is g/min;VFeFor adding iron powder speed, unit is g/min;
Step 3, chooses and adds iron powder speed VFeFor 20g/min～150g/min; Determine alloy powder powder feeding rate Vf;
Step 4, starts welder, adjusts 8-15mm place, welding gun distance pending steel surface, regulates the first air taking port(1) the speed V that supplies gasGas 1, with the interpolation iron powder speed V of the first powder feeding mouth (2)Fe, regulate the second air taking port (4)The speed of supplying gas be VGas 2, with the alloy powder powder feeding rate Vf of the second powder feeding mouth (5), in non-melt pole gas shieldWelding gun passes into 10%Ar and 90%N2Gaseous mixture, regulates its speed V that supplies gasGas 3, weld, carry out former to steel surfaceThe metallurgical nitrogen pick-up processing in position.
2. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, itsBe characterised in that, bonding speed is 3～16mm/min.
3. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, its spyLevy and be, welding current is 80A～200A.
4. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, itsBe characterised in that the speed of supplying gas VGas 1, the speed of supplying gas VGas 2; The speed of supplying gas VGas 3, meetVGas 1≈VGas 2≈VGas 3＝15～40L/min。
5. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, itsBe characterised in that described alloy powder is determined by the alloying element i content Wif% ratio of the high nitrogen steel of target layer.
6. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, itsBe characterised in that, the content Wif% of described alloying element i, through revising relational expression WifRevise% ≈ Wif% × (1+ μ i+ ξ) repaiiesJust; Wherein WifRevise% is correction value, and μ i is scaling loss coefficient, μ i=0.2%～5%, and ξ is scattering spatter loss coefficient,ξ＝2％～8％。
7. employing nitrogen arc according to claim 1 and nitride in-situ metallurgy are realized the method for steel surface nitrogen pick-up, itsBe characterised in that, described alloying element i is not containing ferro element.
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| CN101444149A (en) * | 2006-04-20 | 2009-05-27 | 材料及电化学研究公司 | Method of using thermal plasma to produce a functionally graded composite surface layer on metals |
| RU2319584C1 (en) * | 2006-05-26 | 2008-03-20 | Государственное образовательное учреждение высшего профессионального образования Волгоградский государственный технический университет (ВолгГТУ) | Electric arc surfacing and welding method with combination type gas shield |
| CN1895830A (en) * | 2006-06-23 | 2007-01-17 | 江苏大学 | Plasma-arc in-situ welding technology of granular enhanced aluminum-based composite material |
| CN101514453A (en) * | 2009-04-01 | 2009-08-26 | 河南省煤科院耐磨技术有限公司 | Method for cladding a hollow electrode nitrogen ion |
| CN101590558A (en) * | 2009-07-03 | 2009-12-02 | 河北农业大学 | Preparation method of reaction nitrogen arc surfacing titanium carbonitride reinforced titanium-based composite coating |
| CN103949751A (en) * | 2014-04-25 | 2014-07-30 | 佳木斯大学 | Method for overlaying nitrogen-reinforced iron-base wear-resistant coating |
| CN104096958A (en) * | 2014-06-27 | 2014-10-15 | 武汉理工大学 | Ceramic reinforced metal matrix composite welding layer plasma overlaying preparation method |
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