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CN-122007704-A - Low-alloy high-strength steel powder core wire for arc additive manufacturing and preparation method thereof

CN122007704ACN 122007704 ACN122007704 ACN 122007704ACN-122007704-A

Abstract

The invention discloses a low-alloy high-strength steel powder core wire for arc additive manufacturing and a preparation method thereof, wherein the low-alloy high-strength steel powder core wire consists of a core powder and a carbon steel belt, the core powder comprises an alloy component and a slag component, the mass ratio of the alloy component is 1.5-3.0wt% of ferrosilicon powder, 3.5-5.0wt% of electrolytic manganese, 1.5-3.0wt% of chromium powder, 7.5-9.5wt% of nickel powder, 6.5-9.0wt% of ferromolybdenum powder, less than or equal to 1.2wt% of ferrovanadium powder, and the balance of iron powder and unavoidable impurities, when the wire is used for arc additive manufacturing, the pile body has excellent plasticity, transverse and longitudinal tensile strength not lower than 850MPa, yield strength not lower than 540MPa, elongation not lower than 14%, and transverse and longitudinal anisotropy rate lower.

Inventors

  • GUO YING
  • BAI GUANSHUN
  • Cai Runhuan
  • LU HAO
  • YAN JINGJUN

Assignees

  • 中国兵器科学研究院宁波分院

Dates

Publication Date
20260512
Application Date
20260107

Claims (8)

  1. 1. The utility model provides a low alloy high strength steel powder core wire for electric arc additive manufacturing, its is by the flux core powder and wrap up the carbon steel tape composition of flux core powder, the flux core powder comprises alloy component and slag system component, its characterized in that: The alloy comprises 1.5-3.0wt% of ferrosilicon powder, 3.5-5.0wt% of electrolytic manganese, 1.5-3.0wt% of chromium powder, 7.5-9.5wt% of nickel powder, 6.5-9.0wt% of ferromolybdenum powder, less than or equal to 1.2wt% of ferrovanadium powder, and the balance of iron powder and unavoidable impurities; The slag system comprises, by mass, 4-7wt% of sodium titanate and potassium titanate, 1-8wt% of bismuth oxide, 5-15wt% of titanium dioxide, 3-10wt% of fluoride, 2-3wt% of potassium feldspar and 1-3wt% of aluminum powder.
  2. 2. The low alloy high strength steel powder core wire for arc additive manufacturing according to claim 1, wherein the mass percentage composition of the stacked body is 0.08-0.10wt% of C, 0.3-1.0wt% of Si, 0.8-2.0wt% of Mn, 0.3-1.0wt% of Cr, 2.0-2.5wt% of Ni, 0.8-1.3wt% of Mo, and V is less than or equal to 0.2wt%.
  3. 3. The low alloy high strength steel powder core wire for arc additive manufacturing according to claim 1, wherein the carbon steel strip comprises less than or equal to 0.12wt% of C, less than or equal to 1.00wt% of Mn, less than or equal to 0.75wt% of Si, less than or equal to 0.040 wt% of P, less than or equal to 0.03wt% of S, and the balance of Fe and unavoidable impurities.
  4. 4. A preparation method of the low-alloy high-strength steel powder core wire for arc additive manufacturing, which is characterized in that the preparation method comprises the following steps: (1) Mixing and drying the powder core, namely placing the weighed powder core into a V-shaped mixer to be uniformly mixed, and placing the mixed powder core into drying equipment to be dried; (2) Filling the flux-cored powder, namely punching the carbon steel strip into a U shape, then putting the flux-cored powder in the step (1) into a U-shaped groove for filling, and then closing the U-shaped groove through rolling; (3) And (3) drawing and sizing the welding wire, namely carrying out primary drawing on the closed carbon steel belt to gradually reduce the diameter of the closed carbon steel belt, and then carrying out multipass drawing and sizing drawing.
  5. 5. The method for preparing the low-alloy high-strength steel powder core wire for arc additive manufacturing according to claim 4, wherein the drying temperature of the core powder in the step (1) is 80-120 ℃ and the drying time is 1-3 hours.
  6. 6. The method for preparing the low-alloy high-strength steel powder core wire for arc additive manufacturing according to claim 4, wherein the bandwidth of the carbon steel wire in the step (2) is 9-12mm, the thickness is 0.4-0.6mm, and the filling rate of the core powder is 20% -28%.
  7. 7. The method for preparing the low-alloy high-strength steel cored wire for arc additive manufacturing according to claim 4, wherein the diameter of the wire after the primary drawing in the step (3) is 4-5mm, and the wire is drawn into a welding wire with the diameter of 0.9-1.4mm by multiple sizing.
  8. 8. The method for preparing the low-alloy high-strength steel powder core wire for arc additive manufacturing according to claim 4, wherein the granularity of each substance in the flux-cored powder in the step (1) is 100-200 meshes so as to ensure that the granularity of the powder is uniform.

Description

Low-alloy high-strength steel powder core wire for arc additive manufacturing and preparation method thereof Technical Field The invention relates to the field of materials for arc additive manufacturing, in particular to a low-alloy high-strength steel powder core wire for arc additive manufacturing and a preparation method thereof. Background The low-alloy high-strength steel takes important place in the fields of ship manufacturing, petroleum pipelines, heavy machinery, bridge engineering and the like by virtue of the advantages of excellent mechanical properties, weldability, low cost and the like. With the development of industry, the demand for low alloy high strength steel members is gradually shifted to the direction of enlargement, weight reduction and complexity. However, the conventional forging, casting or machining methods are difficult to meet the manufacturing requirements of large-scale complex low-alloy high-strength steel components, and limit the full play of the high-performance application value of the high-strength steel components. In recent years, rapid advances in arc additive manufacturing technology have provided new approaches to solving this problem. The technology has successfully manufactured low alloy high strength steel components such as industrial valves, petroleum pipelines, large ships, double-arm stern shaft brackets, nuclear power emergency pump pipelines and the like, and has been put into practical engineering application. The low-alloy high-strength steel arc additive manufacturing technology uses an arc as a heat source, adopts a low-alloy high-strength steel powder core wire as a filling metal, and stacks the melted metal layer by layer according to a preset path by controlling the movement track of an arc welding gun through a program, so that the integral rapid forming of a large complex low-alloy high-strength steel member is realized. Compared with other manufacturing technologies, the low-alloy high-strength steel arc additive manufacturing technology has remarkable advantages in realizing die-free, rapid and full-compact near-net forming of large-size, high-performance and complex metal parts. Although the arc additive manufacturing technology shows wide application prospect in the field of low alloy high-strength steel, the low alloy high-strength steel wire special for arc additive manufacturing is deficient at present, commercial welding wires are mainly adopted to replace the arc additive manufacturing technology at present, the defects of alloy element burning loss, coarse microstructure and the like easily occur in the additive manufacturing process, so that the strong plasticity is poor in matching, and the structure has obvious preferential growth in the additive manufacturing process, so that the mechanical property of a component has obvious anisotropy, and the application and popularization of the arc additive manufacturing technology for low alloy high-strength steel are limited. Therefore, the development of the low-alloy high-strength steel wire material for arc additive manufacturing with good strong plastic matching and low anisotropy has important engineering application value. Disclosure of Invention The invention aims to solve the primary technical problem, and aims to provide a low-alloy high-strength steel powder core wire for arc additive manufacturing, which has excellent mechanical properties and lower anisotropism, aiming at the defects of the prior art. The invention solves the first technical problem by adopting the technical scheme that the low alloy high-strength steel powder core wire for arc additive manufacturing consists of a flux-cored powder and a carbon steel strip wrapping the flux-cored powder, wherein the flux-cored powder consists of an alloy component and a slag system component, and is characterized in that: The alloy comprises 1.5-3.0wt% of ferrosilicon powder, 3.5-5.0wt% of electrolytic manganese, 1.5-3.0wt% of chromium powder, 7.5-9.5wt% of nickel powder, 6.5-9.0wt% of ferromolybdenum powder, less than or equal to 1.2wt% of ferrovanadium powder, and the balance of iron powder and unavoidable impurities; The slag system comprises, by mass, 4-7wt% of sodium titanate and potassium titanate, 1-8wt% of bismuth oxide, 5-15wt% of titanium dioxide, 3-10wt% of fluoride, 2-3wt% of potassium feldspar and 1-3wt% of aluminum powder. And in the arc additive manufacturing process, the silicon and the manganese mainly play a role of combined deoxidation to generate silicate with low density and low melting point. However, when the ferrosilicon and electrolytic manganese contents are excessively high, a large amount of inclusions are generated in the continuous additive manufacturing process. These inclusions are difficult to quickly float up in the molten pool and drain, thus remain inside the material, resulting in a significant decrease in the material properties. Therefore, the mass fraction of the ferrosilicon is controlled t