CN105772909B - A kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product - Google Patents

A kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product Download PDF

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CN105772909B
CN105772909B CN201610008872.1A CN201610008872A CN105772909B CN 105772909 B CN105772909 B CN 105772909B CN 201610008872 A CN201610008872 A CN 201610008872A CN 105772909 B CN105772909 B CN 105772909B
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powder
gas
nitrogen
high nitrogen
nitride
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CN105772909A (en
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周琦
孔见
王克鸿
周春东
朱军
彭勇
孙宏宇
蔡雅君
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Jiangsu Shuoshi Welding Science & Technology Co Ltd
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Jiangsu Shuoshi Welding Science & Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • B23K9/044—Built-up welding on three-dimensional surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

Abstract

Nitrogen arc and the devices and methods therefor of nitride 3D printing high nitrogen steel product are utilized the present invention provides a kind of, the built-up welding shaping for carrying out setting layer high nitrogen steel under normal pressure using the method for nitrogen arc wire feed increasing material manufacturing is realized, while nitride alloy powder is added into molten bath using nitrogen powder feeding.Coaxial spiral gas powder cover inner wall boring has spiral gas powder tank, nitride alloy powder forms rotary pneumatic powder stream in welding gun mouth, loss caused by scattering when reducing nitride alloy powder outflow muzzle, while ensure that nitride alloy powder with entering molten bath after the abundant metallurgical smelting of molten drop of welding wire end.Parameter by controlling 3D printing matches, and can obtain the high nitrogen steel printable layer of different nitrogen contents.Using nitride alloy powder is synchronous with welding wire coaxially add powder wire feed by the way of, realization utilize ordinary steel welding wire nitride alloy powder nitrogen arc complex technique 3D printing high nitrogen steel product under normal pressure.

Description

A kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product
Technical field
The invention belongs to RP technique field, and in particular to one kind utilizes nitrogen arc and nitride 3D printing high nitrogen steel system The device and method of product, suitable for the increasing material manufacturing of high nitrogen steel material, welding and part reparation.
Background technology
Interstitial element nitrogen and other alloying element (Mn, Cr, Mo, V, Nb and Ti etc.) coordinative roles in high nitrogen steel, can change The intensity of kind steel, toughness, creep resistance, wear-resisting property, corrosion resistance etc..But nitrogen solubility is very under atmospheric pressure for nitrogen Low, addition is highly difficult, and since addition is few, its Beneficial Effect is less obvious, and the universal mode of production of high nitrogen steel is that pressurization is smelted, Need special production equipment, yield is limited and of high cost.In addition, the processing performance of high nitrogen steel deteriorates, processing sclerotic conditions are tight Weight, the design, quality and process parameter control requirement to process tool are stringent.Two aspect factors combine so that high nitrogen steel is answered With being restricted.
Electric arc 3D printing technique, i.e. electric arc wire feeding increases material manufacturing technology, are to be melted metal wire material using arc surfacing principle Change, directly manufacture the process of theoretical density 3-dimensional metal part under control of the computer.With foundry engieering and mechanical processing The conventional methods such as method are compared, and the process simplification of electric arc wire feeding increases material manufacturing technology, stock utilization improve, production cost drop It is low, mechanical processing difficulty is low, while can control the gross imperfection and component segregation in part, subsequent processing operations simplify, Suitable for novel product rapid development and batch production.
Existing electric arc 3D printing technique generally comprises：Coaxial or paraxonic wire feed electric arc 3D printing and powder feeding electric arc 3D are beaten Print, powder cannot rotate when coaxially being added without silk powder, and adding powder.Have what is be synchronously sent into using silk powder in laser 3D printing technology Mode, but be not carried out silk powder and be coaxially sent into, and the uniformity of composition of weld line is bad.
Chinese patent (200710141482.2) discloses a kind of cladding apparatus based on argon arc welding, it is using coaxial Automatic powder feeding system, the dilution rate of the cladding layer obtained is high, and generally about 5%~10%, its cladding layer area is big, for 3D printing work During skill, then the accurate control of printing product size is can not achieve.Chinese patent (201210250419.3) discloses a kind of high nitrogen The double-layer air-flow protection TIG weld method of steel, which employs the protection of double-deck nitrogen, but its nitrogen pick-up effect is poor, and is unable to wire feed Add powder.Chinese patent (94240533.1) discloses a kind of gas rotation type paint spray pistol, and the inner surface boring of its tracheae has screw thread Spin line, makes vaporific paint form orientation, its scattering surface is diminished, but utility model patent is in tubular structure inner wall actually Boring screw thread spin line, its to gas powder stream to flow to restriction effect poor.
The content of the invention
It is an object of the invention to provide a kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product,
A kind of technical solution using nitrogen arc and the method for nitride 3D printing high nitrogen steel product of the invention is：
A kind of device that steel surface nitrogen pick-up is realized using nitrogen arc and nitride in-situ metallurgy, it mainly includes：
One electrode gas shielded arc welding gun；
It is equipped with the one coaxial transmission device of gas powder with electrode gas shielded arc welding gun with axial screw gas powder cover, coaxial spiral The screw thread being fastenedly connected with electrode gas shielded arc welding gun is provided with gas powder cover；In the coaxial transmission device of gas powder, spiral gas powder cover It is externally provided with the powder feeding plenum duct tangent with spiral gas powder cover outer wall；Powder feeding plenum duct has air taking port and powder feeding mouth； The inner wall of the spiral gas powder cover is provided with spiral gas powder tank；
For spiral gas powder tank as described above in spiral gas powder cover, its structure can be to become helical-varying pitch-variable cross-section knot Structure, the spiral gas powder tank are half slot, and a diameter of 2mm~7mm of groove, from top, Gradient reduces；Helix angle 0 °~ 60 ° of sections reduce from top and Gradient, and the spiral gas powder cover is using the manufacture of heat proof material SiC ceramic.
Powder feeding governor and gas flow meter is respectively provided with powder feeding mouth and air taking port as described above.
The gas powder outlet of spiral gas powder cover as described above is in necking down shape, and the extended line in necking down face is directed toward arc center.
Electrode gas shielded arc welding gun nozzle as described above is manufactured with heat proof material SiC ceramic, the consumable electrode gas Body protects welding gun, and the reach of its outer upper processing is at least twice of its diameter.
A kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product as described above, its method specific steps is such as Under：
Step 1, by the subject alloy component of target high nitrogen steel product, iron content W is determinedFe%；Select mild steel Welding wire is as wire feed raw material；
According to the subject alloy component of target high nitrogen steel product, determine to close in the required alloy powder as powder feeding raw material The content Wif% ratios of gold element i, are corrected relational expression WifCorrect% ≈ Wif% × (1+ μ i+ ξ) obtains alloy in powder after correcting The correction value Wif of element i contentsCorrect%；Wherein μ i are scaling loss coefficient, and μ i=0.2%~5%, ξ are scattering spatter loss coefficient, ξ=2%~8%；Alloying element in the alloy powder of powder feeding raw material is not iron；
Step 2, according to the content Wi% of alloying element i in target high nitrogen steel and the relational expression of iron contentThe component for obtaining all alloying elements and ferro element compares α:β, determines that the powder feeding for being sent into molten bath is former The quality of material and the mass ratio α of wire feed raw material:β, if into the material powder quality m in molten bathPowder=Vf × Δ t, into molten bath Wire feed raw material qualityWherein Vf is to add powder speed, unit g/min；Vs is wire feed rate, Unit is m/min；D is gage of wire, unit m；ρ is welding wire density, unit g/m3；Δ t is the time, unit min；
Step 3, according to formulaDetermine powder feeding rate Vf with Wire feed rate Vs parameter matching relationships,Formula Vf must be simplified:(K×Vs) =α:β；
Step 4, it is 1.5m/min~12m/min to choose wire feed to send rate Vs；According to formula Vf:(K × Vs)=α:β, draws Powder feeding rate Vf；
Step 5, start the device of nitrogen arc and nitride 3D printing high nitrogen steel product, adjusted on the coaxial transmission device of gas powder Powder feeding rate is Vf, speed of supplying gas is VGas 1, the wire feed rate for adjusting electrode gas shielded arc welding gun is Vs, and shielding gas velocity is VGas 2, welded；
Step 6,3D printing route is determined according to target high nitrogen steel article shape size, built-up welding is carried out with bonding speed v, often When one layer of heap is soldered, welding gun is improved into a thickness, repeated overlaying weldability process finally obtains high nitrogen steel product.
Preferably, the speed V that supplies gas on the coaxial transmission device of gas powderGas 1With welding gun shielding gas velocity VGas 2Meet VGas 1≈VGas 2 =15~40L/min.
Preferably, bonding speed v is 3~16mm/s.
The present invention has following remarkable advantage compared with prior art：
(1) using nitride alloy powder is synchronous with welding wire coaxially add powder wire feed by the way of, realize under normal pressure gas- The coaxial electric arc 3D printing high nitrogen steel of three synchronizations of powder-silk；
(2) the nitride alloy powder of addition can form rotary pneumatic powder stream in welding gun mouth, be conducive to nitride alloy powder With the abundant metallurgical smelting of the molten drop of welding wire end and molten bath, while ensure that nitride alloy powder is accurately sent into molten bath, and subtract The loss that few scattering and splash zone come, the high nitrogen steel product composition of gained are uniform；
(3) by adjusting the alloying component of nitride alloy powder and adding the parameter matching of powder wire feed, can be gone out with 3D printing The high nitrogen steel product of different nitrogen contents；
(4) the nitrogen coordinative role of nitrogen arc and transmission nitride alloy powder, contributes to the raising of nitrogen partial pressure, effectively control The effusion of nitrogen is fused into molten bath, nitrogen pick-up effect increase rate is big；
(5) compared with directly with high nitrogen steel powder 3D printing high nitrogen steel method, the ordinary steel welding wire used in the present invention adds suitable The nitride alloy powder 3D printing of amount goes out the method for high nitrogen steel product, avoids high nitrogen steel being processed into the problem of powder is difficult, Technique is simplified, cost reduction.
Brief description of the drawings
Fig. 1 be using nitrogen arc and nitride 3D printing high nitrogen steel article device structure diagram,
Fig. 2 is the longitudinal sectional view of coaxial gas powder cover；
Fig. 3 is the Section A-A sectional view using nitrogen arc and nitride 3D printing high nitrogen steel article device.
Wherein, 1 is plenum duct, and 2 be powder feeding passage, and 3 be spiral gas powder cover, and 4 be spiral gas powder tank, and 5 be consumable electrode gas Body protects welding gun.
Embodiment
Nitrogen arc and the high nitrogen of nitride 3D printing are utilized to one kind of the present invention with specific embodiment below in conjunction with the accompanying drawings The devices and methods therefor of steel part is further described.
It is a kind of to include a consumable electrode gas-arc using nitrogen arc and the device of nitride 3D printing high nitrogen steel product, the device Welding gun 5；
The one coaxial transmission device of gas powder, is equipped with electrode gas shielded arc welding gun 5 with axial screw gas powder cover 3, spiral shell in it The screw thread being fastenedly connected with electrode gas shielded arc welding gun 5 is provided with rotation gas powder cover 3；
In the coaxial transmission device of gas powder, spiral gas powder cover 3 be externally provided with the powder feeding tangent with 3 outer walls of spiral gas powder cover supply gas it is logical Road；
Powder feeding plenum duct has air taking port 1 and powder feeding mouth 2；
The inner wall of spiral gas powder cover 3 is provided with spiral gas powder tank 4.
For the structure of spiral gas powder tank 4 to become helical-varying pitch-variable section structure, the spiral gas powder tank 4 is semicircle Groove, a diameter of 2mm~7mm of groove, from top, Gradient reduces；Helix angle reduces in 0 °~60 ° sections from top and Gradient, institute The spiral gas powder tank 4 stated is using the manufacture of heat proof material SiC ceramic.
Powder feeding governor and gas flow meter is respectively provided with powder feeding mouth 1 and air taking port 2.
The gas powder outlet of the spiral gas powder cover 3 is in necking down shape, and the extended line in necking down face is directed toward arc center.
The electrode gas shielded arc welding gun 5 is manufactured with heat proof material SiC ceramic, the gas metal-arc welding The reach of 5 outer wall of rifle processing is at least twice of its diameter.
The present invention carries out the built-up welding shaping of setting layer high nitrogen steel using the method for nitrogen arc wire feed increasing material manufacturing, while utilizes nitrogen Pneumatic transmission powder adds nitride alloy powder into molten bath.Parameter by controlling 3D printing matches, and can obtain different nitrogen contents High nitrogen steel printable layer.When every layer of built-up welding is completed, welding gun improves a thickness, and repeated overlaying weldability obtains high nitrogen steel product.Using nitridation The thing alloy powder mode for coaxially adding powder wire feed synchronous with ordinary steel welding wire, realization utilize ordinary steel welding wire-nitridation under normal pressure Thing alloy powder-nitrogen arc complex technique 3D printing high nitrogen steel product.
Nitrogen pick-up principle is, on the one hand, filling silk material is burnt and melted in nitrogen arc, forms molten drop, and the nitrogen in nitrogen arc enters Molten drop, causes nitrogen content increase in molten drop, while nitrogen partial pressure is higher in nitrogen arc, and molten bath can be controlled to have fused into the effusion of nitrogen；Separately On the one hand, nitride alloy powder fuses into molten drop after being heated in nitrogen arc, further increases the nitrogen content of molten drop.Nitride closes Bronze end is also equipped with other alloying elements, such as Mn, Cr, Mo element in addition to nitride, to ensure that nitrogen is solid-solubilized in atomic form In high nitrogen steel.
Embodiment 1
Using above device, high nitrogen steel component is prepared using the method for nitrogen arc and nitride 3D printing high nitrogen steel product, its Size is 100mm × 100mm × 40mm, is made of 20 layers of overlay cladding, is 2mm per floor height, every layer of weld seam is made of 7 weld seams.
Using the method for the present invention using nitrogen arc and nitride 3D printing high nitrogen steel product, it is concretely comprised the following steps：
Step 1, by the subject alloy component of target high nitrogen steel product, iron content W is determinedFe%；Select mild steel Welding wire is as wire feed raw material；
According to the subject alloy component of target high nitrogen steel product, the required nitride alloy powder as powder feeding raw material is determined The content Wif% ratios of alloying element i, are corrected relational expression Wif in endCorrect% ≈ Wif% × (1+ μ i+ ξ) obtains powder after correcting The correction value Wif of middle alloying element [i] contentCorrect%, and prepare nitride alloy powder；Wherein μ i are scaling loss coefficient, μ i= 0.2%~5%, ξ are to scatter spatter loss coefficient, ξ=2%~8%；
Nitride alloy powder raw material includes：Chromium nitride powder, nitrogenized manganese powder, chromium powder, manganese powder, molybdenum powder.Target The component requirements of high nitrogen steel are as shown in table 1.H08Mn2Si welding wires are selected, the requirement of its chemical composition is as shown in table 2.
When powder presses CrN:MnN:Cr:Mn:Mo=4：4：18.85：11.8：When 1.5, meet target product alloying element into Divide content ratio.According to amendment relational expression WifCorrect% ≈ Wif% × (1+ μ i+ ξ), the formula that amendment obtains material powder are：CrN: MnN:Cr:Mn:Mo=4：4：19：12：When 1.5, high nitrogen steel product, and high nitrogen steel system can be printed by being used cooperatively with steel welding wire The component of product is N:1.66%, Mn:15%, Cr:22%, Mo:1.5%, surplus is iron.
The chemical composition of 1 target high nitrogen steel of table 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
2 H08Mn2SiA welding wires chemical composition (%) of table
Step 2, according to the content Wi% of alloying element i of the target high nitrogen steel in addition to ferro element and the pass of iron content It is formulaThe component for obtaining all alloying elements and ferro element compares α:β≈2:3, determine to be sent into molten bath Alloy powder quality and welding wire mass ratio be 2：3, into the powder quality m in molten bathPowder=Vf × Δ t, into molten bath Quality of Final Welding WireWherein Vf is to add powder speed, unit g/min；Vs is wire feed rate, unit m/ min；D is gage of wire, unit m；ρ is welding wire density, unit g/m3；Δ t is the time, unit min.
Step 3, according to formulaDetermine powder feeding rate Vf with Wire feed rate Vs parameter matching relationships,Formula Vf must be simplified:(K×Vs) =α:β；Density p=7.85g/cm of welding wire3, diameter d=1.6mm, substitutes into and calculates to obtain K=15.78g/m.
Step 4, it is 5m/min to choose wire feed rate Vs；Pass through formula Vf again:(K × Vs)=α:β, draws powder feeding rate Vf =52.6g/min；
Step 5, start the device of nitrogen arc and nitride 3D printing high nitrogen steel product, adjusted on the coaxial transmission device of gas powder Powder feeding rate is Vf, send nitrogen rate to be VGas 1, the wire feed rate of electrode gas shielded arc welding gun is set as Vs, adjusts consumable electrode The shielding gas velocity of gas protective welding gun is VGas 2, the speed of supplying gas of gas is 10L/min~20L/min at two.Nitride closes Transmitted with 100% nitrogen at bronze end.Nitrogen arc is the electric arc under nitrogen atmosphere, and wherein nitrogen ginseng has 5%~10% Ar, with true Protecting electric arc being capable of smoothly striking and stable burning.And welded；
Step 6,3D printing route is determined according to target high nitrogen steel article shape size, bonding speed v takes 58.3cm/min. Built-up welding is carried out, when each layer of heap is soldered, welding gun is improved into a thickness, repeated overlaying weldability process, is finally folded by 20 floor height nitrogen steel layer Add to form high nitrogen steel product.When high nitrogen steel 3D printing product completes to terminate welding, it need to first stop wire feed and add powder, then stop again Supply gas, to prevent dust explosion.

Claims (7)

  1. A kind of 1. method using nitrogen arc and nitride 3D printing high nitrogen steel product, it is characterised in that as follows including step：
    Step 1, according to the alloying component of target high nitrogen steel product, the component for obtaining alloying element i and ferro element compares α:β, determines It is sent into the quality of the powder feeding raw material in molten bath and the mass ratio of wire feed raw material；
    Step 2, according to the quality for the powder feeding raw material for being sent into molten bath and the mass ratio of wire feed raw materialDetermine powder feeding rate Vf and wire feed rate Vs parameter matching relationships； Wherein, Vf is powder feeding rate, unit g/min；Vs is wire feed rate, unit m/min；D is gage of wire, unit m；ρ For welding wire density, unit g/m3；Δ t is the time, unit min；mPowderTo be sent into the quality of the powder feeding raw material in molten bath, mSilkFor into Enter the quality of the wire feed raw material in molten bath；
    Step 3, it is 1.5m/min~12m/min to choose wire feed to send rate Vs, draws powder feeding rate Vf；
    Step 4, start the device of nitrogen arc and nitride 3D printing high nitrogen steel product, powder feeding is adjusted on the coaxial transmission device of gas powder Powder feeding rate Vf, the speed V that supplies gas of air taking port of mouthGas 1, adjust the wire feed rate Vs of electrode gas shielded arc welding gun, protect gas Speed VGas 2, welded；
    Step 5,3D printing route is determined according to target high nitrogen steel article shape size, built-up welding, each layer is carried out with bonding speed v When heap is soldered, welding gun is improved into a thickness, repeated overlaying weldability process finally obtains high nitrogen steel product.
  2. 2. the method for nitrogen arc according to claim 1 and nitride 3D printing high nitrogen steel product, it is characterised in that described The speed V that supplies gas on the coaxial transmission device of gas powderGas 1With welding gun shielding gas velocity VGas 2Meet VGas 1≈VGas 2=15~40L/min.
  3. 3. the method for nitrogen arc according to claim 1 and nitride 3D printing high nitrogen steel product, it is characterised in that described Bonding speed v is 3~16mm/s.
  4. 4. the method for nitrogen arc according to claim 1 and nitride 3D printing high nitrogen steel product, it is characterised in that step 1 In, mild steel weldinmg rod is selected as wire feed raw material.
  5. 5. the method for nitrogen arc according to claim 1 and nitride 3D printing high nitrogen steel product, it is characterised in that step 1 In, the powder feeding raw material, according to the content Wif% of the alloying element i beyond iron removaling in target high nitrogen steel product than determining.
  6. 6. the method for nitrogen arc according to claim 5 and nitride 3D printing high nitrogen steel product, it is characterised in that described The content Wif% of alloying element i, is corrected relational expression WifCorrect% ≈ Wif% × (1+ μ i+ ξ) is corrected；Wherein WifCorrect% is to repair On the occasion of μ i are scaling loss coefficient, and μ i=0.2%~5%, ξ are to scatter spatter loss coefficient, ξ=2%~8%.
  7. 7. the method for nitrogen arc according to claim 1 and nitride 3D printing high nitrogen steel product, it is characterised in that described Alloying element i is free of ferro element.
CN201610008872.1A 2016-01-06 2016-01-06 A kind of method using nitrogen arc and nitride 3D printing high nitrogen steel product Active CN105772909B (en)

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CN108788406B (en) * 2018-07-04 2020-01-07 西南交通大学 Light metal-based composite material component and preparation method thereof
EP3733326A1 (en) 2019-04-30 2020-11-04 Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG Method for producing a steel component with an additive production method
CN110587078A (en) * 2019-08-15 2019-12-20 南京理工大学 Nitrogen fixation device and method in multi-element activated nitrogen arc welding process
CN110560842B (en) * 2019-08-26 2022-03-22 南京理工大学 Nitrogen fixation device and method in welding based on paraxial wire feeding
CN112404668B (en) * 2020-10-29 2022-09-13 南京理工大学 Powder feeding electric arc additive device and method for high-nitrogen steel
WO2022211728A1 (en) * 2021-03-30 2022-10-06 Agency For Science, Technology And Research Method for fabricating a nitrogenous steel material

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