A method of 3D printing high nitrogen steel products using nitrogen arc and nitride

Abstract

The invention provides a device for 3D printing of a high-nitrogen steel product through nitrogen arc and nitrides and a method thereof. Surfacing forming of high-nitrogen steel with set layers is achieved at the ordinary pressure through a nitrogen arc wire feeding additive manufacturing method, and nitride alloy powder is added into a molten pool through nitrogen powder feeding. Spiral gas powder grooves are bored in the inner wall of a coaxial spiral gas powder cover. The nitride alloy powder forms rotary gas powder flow at a welding gun muzzle, the loss caused by scattering when the nitride alloy powder flows out of the gun muzzle is reduced, and the effect that the nitride alloy powder and molten drops at the ends of welding wires are fully and metallurgically smelted and then enter the molten pool is ensured. By controlling parameter matching of 3D printing, high-nitrogen steel printing layers with different nitrogen contents can be obtained. The mode of nitride alloy powder and welding wire synchronous coaxial power adding and wire feeding is adopted, and 3D printing of the high-nitrogen steel product at the ordinary pressure is achieved through a common steel welding wire-nitride alloy powder-nitrogen arc composite technology.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, and specifically relates to a device and method for 3D printing high-nitrogen steel products by using nitrogen arc and nitride, and is suitable for additive manufacturing, welding and part repair of high-nitrogen steel materials. Background technique [0002] The interstitial element nitrogen in high nitrogen steel coordinates with other alloying elements (Mn, Cr, Mo, V, Nb and Ti, etc.), which can improve the strength, toughness, creep resistance, wear resistance and corrosion resistance of steel. However, the solubility of nitrogen under atmospheric pressure is very low, and it is very difficult to add. Due to the small amount of addition, its beneficial effect is not obvious. The common production method of high nitrogen steel is pressure smelting, which requires special production equipment, limited output and high cost. . In addition, the processing performance of high-nitrogen st...

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Problems solved by technology

[0004] Existing arc 3D printing technologies generally include: coaxial or side-axis wire-fed arc 3D printing and powder-fed arc 3D printing, without coaxial addition of silk powder, and the powder cannot be rotated when adding powder

In laser 3D printing technology, there is a method of synchronous feeding of silk powder, but coaxial feeding of silk powder is not realized, and the uniformity of the weld composition is not good

[0005] Chinese patent (200710141482.2) discloses a cladding device based on argon arc welding, which adopts a coaxial powder feeding method, and the dilution rate of the obtained cladding layer is high, generally about 5% to 10%. The layer area is large, and when used in 3D printing technology, it is impossible to achieve precise control of the size of the printed product

Chinese patent (201210250419.3) discloses a double-layer gas flow protection TIG welding method for high-nitrogen steel, which uses double-layer nitrogen protection, but its nitrogen increasing effect is poor, and it cannot feed wire and add powder

Chinese patent (94240533.1) discloses a gas rotary paint spray gun, the inner surface of the gas pipe is bored with helical spirals, so that the mist paint forms a directional effect and makes the scattering surface smaller, but the utility model patent is actually in the tubular structure The inner wall is bored with thread helix, which has a poor effect on restricting the flow direction of the gas powder flow

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