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Powder material for laser melting deposition stainless steel-based composite material, and preparation method

A technology of laser melting deposition and composite material, which is applied in the field of powder and preparation of laser melting deposition TiC reinforced stainless steel matrix composite material, can solve the problems of poor bonding between reinforcement and matrix, easy segregation of reinforcement, high cost, etc. The effect of production cycle, good mechanical properties and short production cycle

Active Publication Date: 2018-06-29
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the research on the manufacturing process of metal matrix composites often focused on the traditional external reinforcement composite method, but people found that there were many problems in the traditional composite technology, such as poor bonding between the reinforcement and the matrix, the reinforcement was easy to segregate, and the process was complicated. expensive, etc.

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  • Powder material for laser melting deposition stainless steel-based composite material, and preparation method
  • Powder material for laser melting deposition stainless steel-based composite material, and preparation method
  • Powder material for laser melting deposition stainless steel-based composite material, and preparation method

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preparation example Construction

[0032] The invention relates to a powder used for laser melting deposition of stainless steel matrix composite materials and a preparation method thereof. The alloy powder components include stainless steel alloy powder, Cr 3 C 2 powder and Ti powder, the mass fraction of the stainless steel alloy powder is 69%-90%; Cr 3 C 2 The mass fraction of powder is 7%-20%; the mass fraction of Ti powder is 3%-11%. The particle size of alloy powder is 50-180 μm, Cr 3 C 2 The purity of powder and Ti powder is not less than 99.9%.

[0033] The alloy powder with a particle size of 50-180 μm is selected because, when the powder particle size is small (less than 50 μm), the laser melting deposition process is easy to block the powder feeder nozzle, and when the powder particle size is large (greater than 180 μm), the synthesized TiC is enhanced. There are many internal defects in stainless steel matrix composites. If the particle size of the powder is within this range, the utilization ...

Embodiment 1

[0041] Stainless steel alloy powder, Cr 3 C 2 The mass ratio of powder and Ti powder is 90:7:3, and the in-situ synthesis of TiC reinforced stainless steel matrix composite material is prepared by laser melting deposition technology. The specific preparation process steps are:

[0042] According to stainless steel alloy, Cr 3 C 2 The mass ratio of Ti alloy powder and Ti alloy powder is 90:7:3 to prepare in-situ synthesized TiC reinforced stainless steel matrix composite material powder. The prepared alloy powder needs to be ball milled in a planetary ball mill or ground and mixed in a mortar for 2 h, and the uniformly mixed The powder was dried in a vacuum oven at 80 °C for 2 h. The fiber laser processing system is adopted, the laser output power is 2 kW, the spot diameter is 5 mm, the scanning speed is 8 mm / s, the powder feeding rate is 11 g / min, and the overlapping rate of large-area laser beam scanning is 40%. It was carried out in a gas-protected room with an Ar gas fl...

Embodiment 2

[0044] Stainless steel alloy powder, Cr 3 C 2 The mass ratio of powder and Ti powder is 81:12:7, and the in-situ synthesis of TiC reinforced stainless steel matrix composite material is prepared by laser melting deposition. The specific preparation process steps are:

[0045] According to stainless steel alloy, Cr 3 C 2 The mass ratio of Ti alloy powder and Ti alloy powder is 81:12:7 to prepare in-situ synthesized TiC reinforced stainless steel matrix composite powder. The alloy powder needs to be ball milled in a planetary ball mill or ground and mixed in a mortar for 3 h, and the uniformly mixed The powder was dried in a vacuum oven at 80°C for 5 h. The fiber laser processing system is adopted, the laser output power is 2 kW, the spot diameter is 5 mm, the scanning speed is 8 mm / s, the powder feeding rate is 11 g / min, and the overlapping rate of large-area laser beam scanning is 40%. It is carried out in an air chamber with a flow rate of 450 L / h. During laser irradiati...

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Abstract

The invention relates to a powder material for a laser melting deposition stainless steel-based composite material, and a preparation method. The preparation method comprises the steps of selecting the following components in mass fraction: 69 percent to 90 percent of stainless steel alloy powder, 7 percent to 20 percent of Cr3C2 powder, and 3 percent to 11 percent of Ti powder, and compounding; and utilizing a laser melting deposition in-situ reaction synthesis reinforcement phase technology for preparing a TiC reinforced stainless steel-based composite material. The production cycle for preparing the metal-based composite material at the present stage is remarkably reduced, the manufacturing efficiency and the manufacturing accuracy are improved, and the prepared composite material is uniform and compact in structure and favorable in mechanical performance, so that the service life of the laser melting deposition stainless steel component is remarkably prolonged; and meanwhile, the adding of precious metal is reduced, so that the production cost of the stainless steel is reduced, and great economic benefit and social benefit are realized.

Description

technical field [0001] The invention is applicable to the field of laser additive manufacturing, and in particular relates to a powder used for laser melting deposition of TiC reinforced stainless steel-based composite materials and a preparation method. Background technique [0002] Due to its excellent corrosion resistance in seawater and acid-base media, stainless steel is widely used in food, petroleum, chemical, nuclear power plants, marine installations and construction industries. However, due to its low hardness (about 200HV), the corrosion resistance of stainless steel is poor, which reduces the service life of stainless steel and limits the application range of stainless steel. This defect can be overcome by introducing a hard ceramic reinforcement phase into stainless steel to prepare TiC reinforced stainless steel matrix composites. Among different metal matrix composites, particle-reinforced metal matrix composites have attracted extensive attention due to thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/23C22C33/02B33Y10/00B33Y70/00
CPCC22C33/0228B22F3/23B33Y10/00B33Y70/00B22F10/00B22F10/322B22F10/25B22F10/34B22F10/36Y02P10/25
Inventor 张松吴臣亮王冲张瀚方崔雪宗洧安张春华
Owner SHENYANG POLYTECHNIC UNIV
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