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A kind of powder used in laser melting deposition stainless steel matrix composite material and its preparation method

A technology of laser melting deposition and composite materials, which is applied in the field of powder and preparation of TiC reinforced stainless steel matrix composite materials by laser melting deposition. The effect of production cycle, good mechanical properties and high mechanical properties

Active Publication Date: 2019-12-06
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • 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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  • A kind of powder used in laser melting deposition stainless steel matrix composite material and its preparation method
  • A kind of powder used in laser melting deposition stainless steel matrix composite material and its preparation method
  • A kind of powder used in laser melting deposition stainless steel matrix composite material and its preparation method

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preparation example Construction

[0032] The invention relates to a powder used for laser melting deposition of a stainless steel matrix composite material and a preparation method. The powder composition comprises 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), it is easy to block the nozzle of the powder feeder during laser melting deposition processing, and the synthesized TiC is enhanced when the powder particle size is larger (greater than 180 μm). There are many internal defects in stainless steel matrix composites. When the powder particle size is within this range, the powder utili...

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 TiC and Ti alloy powder is 90:7:3 to prepare in-situ synthesis of TiC reinforced stainless steel matrix composite powder. The prepared alloy powder needs to be ground and mixed in a planetary ball mill or a mortar for 2 h. The powder was dried in a vacuum drying oven at 80°C for 2h. Using a fiber laser processing system, 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 overlap ratio of large-area laser beam scanning is 40%. It was carried out in a gas protective chamber with an Ar gas flow of 400 L / h. During laser irradiation, Cr 3 C 2 It is d...

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 TiC and Ti alloy powder is 81:12:7 to prepare in-situ synthesis of TiC reinforced stainless steel matrix composite powder. The prepared alloy powder needs to be ground and mixed in a planetary ball mill or a mortar for 3 hours. The powder was dried in a vacuum drying oven at 80 °C for 5 h. A fiber laser processing system is used, the laser output power is 2kW, the spot diameter is 5 mm, the scanning speed is 8 mm / s, the powder feeding rate is 11 g / min, and the overlap ratio of large-area laser beam scanning is 40%. In the chamber, the flow rate is 450 L / h. During laser irradiation, Cr 3 C 2 It is decomposed into free Cr and C atoms, and...

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Abstract

The invention relates to a powder used in laser melting deposition of stainless steel-based composite materials and a preparation method. The mass fraction of the stainless steel alloy powder is selected to be 69%-90%; Cr 3 C 2 The mass fraction of powder is 7%-20%; the mass fraction of Ti powder is 3%-11%. Using laser melting deposition in-situ reaction synthesis reinforcement phase technology, TiC reinforced stainless steel matrix composite material is prepared, which significantly shortens the At this stage, the production cycle of metal matrix composite materials is prepared to improve manufacturing efficiency and precision, so that the prepared composite materials have uniform and dense structure and good mechanical properties, thereby significantly improving the service life of laser melting deposited stainless steel components, while reducing the addition of precious metals. Reducing the production cost of stainless steel has huge economic and social benefits.

Description

technical field [0001] The invention is applicable to the field of laser additive manufacturing, in particular to a powder used for laser melting deposition of TiC reinforced stainless steel-based composite materials and a preparation method. Background technique [0002] Stainless steel is widely used in food, petroleum, chemical, nuclear power plants, marine installations and construction industries due to its excellent corrosion resistance in seawater and acid-base media. 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 reinforcing phase into stainless steel to prepare TiC-reinforced stainless steel matrix composites. Among different metal matrix composites, particle-reinforced metal matrix composites have received extensive attention due to their isotropic char...

Claims

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Application Information

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Patent Type & Authority Patents(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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