Additive manufacturing method of ultrafine-grained materials

An additive manufacturing and ultra-fine grain technology, applied in the field of additive manufacturing, can solve the problems of uneven structure and performance of large-scale workpieces, the inability to realize the preparation of parts with complex shapes, and the inability to prepare parts with complex shapes. Industrial production application, deposition efficiency and high density, effect of fine grain

Inactive Publication Date: 2018-03-27
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method can prepare large-sized bulk ultra-fine-grained metal materials, but there are some shortcomings in industrial production: such as ECAP industrial production equipment is expensive, extrusion dies are severely worn, etc., which lead to high production costs, and are often used in profiles and bars. The ARB process is suitable for the production of plates, but the material cracks in the production process are difficult to solve, resulting in a decline in product quality and yield; the HPT process is suitable for the production and processing of bars, but the structure and properties of large-sized workpieces are not uniform
It can be seen that the existing technology is only suitable for the preparation of ultra-fine grain bulk materials with simple shapes, and cannot prepare parts with complex shapes.
Chinese patent application No. 201310479359.7 discloses a method for preparing ultra-fine-grained titanium-based composite materials through equal-diameter curved channel deformation. After multi-pass equal-diameter angular extrusion deformation, ultra-fine-grained titanium can be obtained. Titanium-based bulk composites with high strength and good plasticity, but cannot realize the preparation of parts with complex shapes

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] A kind of additive manufacturing method of ultrafine grain metal or alloy material of the present invention, comprises the following steps:

[0022] (1) Al metal powder with an average particle size of 15 μm and Al metal powder with an average particle size of 25 μm 2 o 3 The ceramic powder was mixed thoroughly for 30 minutes in a tubular mixer at a volume ratio of 90:10. Weigh 2 kg of the powder mixture, put it in a vacuum drying oven, and evacuate to 0.5×10 -3 Pa, the drying temperature is set at 80° C., and the drying time is 6 hours.

[0023] (2) Pour the dried mixed powder into the powder feeder, use an 80-mesh filter screen at the low-end chute, and the powder feeding rate is 10g / min. The high-pressure gas is helium with a purity >99.9%, the gas pressure is 1MPa, and the temperature of the gas heater is set at 400°C. The distance between the outlet of the spray gun and the surface of the substrate is 12 mm, and the moving speed of the spray gun is 100 mm / min. ...

Embodiment 2

[0027] A kind of additive manufacturing method of ultrafine grain metal or alloy material of the present invention, comprises the following steps:

[0028] (1) Mix Zn metal powder with an average particle size of 5 μm and SiC ceramic powder with an average particle size of 10 μm in a tubular mixer at a volume ratio of 70:30 for 60 minutes. Weigh 2 kg of the powder mixture, put it in a vacuum drying oven, and evacuate to 1×10 -3 Pa, the drying temperature is set at 60° C., and the drying time is 12 hours.

[0029] (2) Pour the dried mixed powder into the powder feeder, use an 80-mesh filter screen at the low-end chute, and the powder feeding rate is 15g / min. The high-pressure gas is helium with a purity >99.9%, the gas pressure is 1.5MPa, and the temperature of the gas heater is set at 350°C. The distance between the outlet of the spray gun and the surface of the substrate is 15 mm, and the moving speed of the spray gun is 100 mm / min. After multiple passes of spraying, the t...

Embodiment 3

[0033] A kind of additive manufacturing method of ultrafine grain metal or alloy material of the present invention, comprises the following steps:

[0034] (1) Mix nickel alloy powder with an average particle size of 25 μm and TiN ceramic powder with an average particle size of 45 μm in a tubular mixer at a volume ratio of 80:20 for 30 minutes. Weigh 2 kg of the powder mixture, put it in a vacuum drying oven, and evacuate to 1×10 -2 Pa, the drying temperature is set to 750°C, and the drying time is 10 hours.

[0035] (2) Pour the dried mixed powder into the powder feeder, use an 80-mesh filter screen at the low-end chute, and the powder feeding rate is 12g / min. The high-pressure gas is helium with a purity >99.9%, the gas pressure is 0.5MPa, and the temperature of the gas heater is set at 550°C. The distance between the outlet of the spray gun and the surface of the substrate is 10 mm, and the moving speed of the spray gun is 100 mm / min. After multiple passes of spraying, t...

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Abstract

The invention discloses an additive manufacturing method of ultrafine-grained materials. The method comprises the steps of firstly, raw material preparing, wherein metal powder and ceramic powder areevenly mixed and are subject to vacuum drying, cold spraying powder is obtained, and the volume ratio of the metal powder to the ceramic powder is 70 to 90 : 30 to 10; secondly, cold spraying deposition forming, wherein the cold spraying powder prepared in the first step is sprayed to a base body or the surface of a pre-deposited body, and a cold spraying deposition body of a ceramic doped metal base composite material is formed; thirdly, stirring friction processing, wherein the cold spraying deposition body is placed on a stirring friction body, a stirring tool is adjusted to be aligned withthe deposition body, under high-speed rotation, and sinks and is pressed into the cold spraying deposition body under high-speed rotation to carry out stirring, the stirring tool head is moved, and covers the whole to-be-machined area to carry out stirring friction machining treatment, and the cold spraying deposition area of an uniform superfine-grained structure is obtained. According to the method, the preparing of the ultrafine-grained materials with the complex shape parts is achieved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to an additive manufacturing method for ultrafine-grained materials. Background technique [0002] When the average grain size is in the range of 100nm to 1 μm, it is defined as ultrafine grained material (Ultrafine Grained, UFG), and when the average grain size is greater than 1 μm, it is defined as coarse grained material (Coarse Grained, CG). Compared with traditional coarse-grained materials, ultra-fine-grained materials have many excellent mechanical properties such as low melting point, high toughness, and high strength. The preparation methods of ultra-fine-grained materials usually include severe plastic deformation methods such as equal-channel bending channel deformation (ECAP), cumulative rolling deformation (ARB), high-pressure torsional deformation (HPT), and the like. The above method can prepare large-sized bulk ultra-fine-grained metal materials, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08B33Y10/00B33Y70/00
Inventor 王强牛文娟王文王快社翟乐
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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