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A method to improve the mechanical properties of additively manufactured austenitic steel

An additive manufacturing and austenitic steel technology, applied in the direction of improving energy efficiency, additive manufacturing, additive processing, etc., can solve the problems of low reuse rate of raw material powder, insufficient precision of formed parts, complicated preparation process, etc. Reduce material defects, save costs, and ensure the effect of mechanical properties

Active Publication Date: 2022-04-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this patent is complicated and cumbersome, including ball milling and mixing of yttrium oxide and 316L powder, forming and drawing, arc additive materials, etc.
In addition, compared with laser additive manufacturing technology, arc additive manufacturing technology has disadvantages such as insufficient precision of formed parts and low reuse rate of raw material powder.

Method used

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  • A method to improve the mechanical properties of additively manufactured austenitic steel
  • A method to improve the mechanical properties of additively manufactured austenitic steel
  • A method to improve the mechanical properties of additively manufactured austenitic steel

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Add 23.53g of yttrium nitrate hexahydrate and 5000g of 316L spherical powder into an appropriate amount of absolute ethanol, and make the yttrium nitrate hexahydrate completely dissolve in dehydrated ethanol by mechanical stirring, and the 316L spherical powder is completely wetted in absolute ethanol , to obtain a solid-liquid mixture, dry the solid-liquid mixture, and then reduce it under a hydrogen atmosphere at 450°C for 6h to obtain a preliminary composite spherical powder, add 5g of pure yttrium powder to the preliminary composite spherical powder, and combine the pure yttrium powder with The preliminary composite spherical powder is ball milled to make it fully mixed, so as to prepare the composite spherical powder for additive manufacturing. The prepared composite spherical powder was used as a printing precursor powder, and 0.25wt.% Y 2 o 3 Composite material doped with 316L, the volume energy density used is 70J / mm 3 , the printing layer thickness is 50μm, t...

Embodiment 2

[0043] Add 170.57g of yttrium nitrate hexahydrate and 6000g of 316L spherical powder into an appropriate amount of absolute ethanol, and use ultrasonic vibration to completely dissolve the yttrium nitrate hexahydrate in absolute ethanol and completely wet the 316L spherical powder in absolute ethanol. Obtain a solid-liquid mixture, dry the solid-liquid mixture, and then reduce it under a hydrogen atmosphere at 600 ° C for 2 hours to obtain a preliminary composite spherical powder. Add 10 g of pure yttrium powder to the preliminary composite spherical powder. The composite spherical powder is ball milled to make it fully mixed, so as to prepare the composite spherical powder for additive manufacturing. The prepared composite spherical powder was used as a printing precursor powder, and 1.0wt.% Y 2 o 3 Composite material doped with 316L, the volume energy density used is 200J / mm 3 , the printing layer thickness is 50μm, the overlap between the melting channels is 10%, and the ...

Embodiment 3

[0045] Add 785.84g of lanthanum nitrate hexahydrate and 6000g of 316L spherical powder into an appropriate amount of deionized water, completely dissolve lanthanum nitrate hexahydrate in deionized water by mechanical stirring, and completely wet the 316L spherical powder in deionized water to obtain solid-liquid Mixture, dry the solid-liquid mixture, and then reduce it under a hydrogen atmosphere at 500°C for 4 hours to obtain a preliminary composite spherical powder, add 20g of pure lanthanum powder to the preliminary composite spherical powder, and compare the pure lanthanum powder and the preliminary composite spherical powder The powder is ball milled to make it fully mixed to prepare a composite spherical powder for additive manufacturing. The prepared composite spherical powder was used as a printing precursor powder, and 1.0wt.% La was prepared by selective laser melting technology (SLM) 2 o 3 Composite material doped with 316L, the volume energy density used is 150J / m...

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Abstract

The invention provides a method for improving the mechanical properties of austenitic steel by additive manufacturing. The soluble rare earth oxide salt and 316L spherical powder are added to absolute ethanol or deionized water, so that the soluble rare earth oxide salt is in the solution, and the 316L spherical powder is The powder is completely wetted to obtain a solid-liquid mixture; the solid-liquid mixture is dried and evaporated, and then calcined and reduced to obtain a preliminary composite spherical powder; the mixed powder of the preliminary composite spherical powder and rare earth elemental powder is ball milled to make it fully mixed, Composite spherical powder is obtained; using composite spherical powder as raw material, the composite spherical powder layer is printed layer by layer through additive manufacturing technology to melt and solidify, and at the same time, rapid laser remelting is performed on each solidified layer to prepare rare earth Oxide doped 316L composite. The invention adjusts the microstructure of the composite material by adding rare earth oxides to improve the mechanical properties of the material.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing of metal composite materials, in particular to a method for improving the mechanical properties of austenitic steel manufactured by additive manufacturing. Background technique [0002] At present, as an advanced process technology, additive manufacturing technology is widely used in materials such as metals, polymers and ceramics. This technology can directly form three-dimensional parts with complex shapes directly from powder, without the need for time-consuming mold design process, and is a kind of "bottom-up" near-net-shaping manufacturing. [0003] 316L austenitic steel is widely used as a structural material for nuclear reactors due to its good ductility, corrosion resistance, oxidation resistance, and relatively low cost. However, the low mechanical properties of 316L austenitic steel limit its application at high temperature. Compared with the 316L austenitic steel manufa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02B22F10/28B22F1/16B22F9/04B33Y10/00B33Y40/10B33Y70/10
CPCC22C33/0235B22F10/28B22F9/04B33Y10/00B33Y40/10B33Y70/10C22C32/0026B22F2009/043Y02P10/25
Inventor 马宗青胡章平杨振文刘永长
Owner TIANJIN UNIV
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