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Method for eliminating cracks in additive manufacturing metal material

A metal material and additive manufacturing technology, which is applied in the field of crack elimination in additive manufacturing metal materials, can solve problems such as changing alloy composition, affecting alloy performance, and inability to process printed parts, so as to achieve tensile strength and elongation. The effect of improving the comprehensive mechanical properties

Pending Publication Date: 2021-05-28
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN110918992A discloses a method for additive manufacturing of high-temperature alloys. By controlling the proportion range of elements such as C and B in the alloy powder, the tendency of cracking in the process of additive manufacturing of high-temperature alloys is eliminated, and microcracks in the workpiece are eliminated; The method of adjusting to improve the hot cracking susceptibility of the alloy will change the alloy composition, which will also affect the properties of the alloy, so only some alloy systems are suitable for this method
The principle of this technology is similar to that of hot isostatic pressing, that is, applying pressure in the high-temperature area of ​​the solid metal to achieve crack healing. However, this method needs to mechanically pressurize the mold to achieve the compaction of the block, so it can only deal with rules such as blocks or columns. The structure of the complex structure cannot be processed, and the ability to manufacture components with complex shapes is the core advantage of additive manufacturing technology

Method used

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  • Method for eliminating cracks in additive manufacturing metal material
  • Method for eliminating cracks in additive manufacturing metal material
  • Method for eliminating cracks in additive manufacturing metal material

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Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a method for eliminating cracks in additive manufacturing metal materials, and samples A and B are processed;

[0046] Put the samples A and B into the heat treatment furnace, and after vacuuming the furnace body, pass high-purity argon gas to suppress the oxidation of the samples. The samples are heated up to 1285°C with the furnace, and the heating rate is 10°C / min, rising to the target temperature After holding for 5 minutes, then cooling to 1200°C at a rate of 2°C / min, that is, the pressure of hot isostatic pressing at this time is 0 MPa, and finally cooling to room temperature with the furnace, and taking out the sample;

[0047] The density value of the sample A (after treatment) was tested by the Archimedes density test method, and its density was increased to 99.86% at this time. figure 2 The density of sample A before and after treatment was compared.

[0048] The internal defect space of sample B (after treatment) was analyzed by x-C...

Embodiment 2

[0051] This embodiment provides a method for eliminating cracks in additive manufacturing metal materials, and samples C and D are processed;

[0052] Put the samples C and D into the heat treatment furnace. After vacuuming the furnace body, pass high-purity argon gas to suppress the oxidation of the samples. The samples are heated up to 1285°C with the furnace, and the heating rate is 10°C / min, and they are kept at the target temperature. After 5 minutes, the furnace body was pressurized by air pressure, the isostatic pressure was 7MPa, and the pressurization rate was 2.5MPa / min. Then keep the pressure constant and cool to 1200°C at a rate of 2°C / min, then cool to room temperature with the furnace, release the pressure, and take out the sample;

[0053] The density value of sample C (after treatment) was tested by the Archimedes density test method, and its density was increased to 99.99% at this time. Figure 4 The density of sample C before and after treatment was compared...

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Abstract

The invention relates to a method for eliminating cracks in an additive manufacturing metal material. The elimination method comprises the following steps of heating the additive manufacturing metal material with the cracks, preserving heat, then carrying out isostatic pressing treatment at the preserving temperature, and performing cooling to obtain the additive manufacturing metal material with the cracks eliminated. According to the elimination method, an intercrystalline liquid film is formed by a trace remelting method, the cracks are backfilled to form a solid-liquid two-phase coexistence state, then the re-solidification rate is controlled to realize uniform solidification shrinkage of the material, isostatic pressure can be applied in the process to inhibit the generation of shrinkage cavities, finally, crack healing and component densification are realized, and meanwhile, the comprehensive mechanical property of the component can be improved.

Description

technical field [0001] The invention relates to the field of defect elimination, in particular to a method for eliminating cracks in additively manufactured metal materials. Background technique [0002] At present, additive manufacturing technology is a digital manufacturing technology that achieves moldless forming of components by adding and accumulating materials layer by layer. It organically integrates "material preparation / precise forming" and discretizes the manufacture of three-dimensional complex shape parts into simple two-dimensional plane shape layer by layer superposition, which overcomes the limitations of traditional processes that are difficult or impossible to process, and can realize real free manufacture. Metal laser additive manufacturing technology integrates the advantages of low cost, short process, high performance, and "shape control / controllability" integration, which can provide a new and effective solution for the preparation of difficult-to-mac...

Claims

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Application Information

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IPC IPC(8): B22F10/64B22F10/66B22F3/24B22F3/15B33Y40/20
CPCB22F3/24B22F3/15B33Y40/20B22F2003/248Y02P10/25
Inventor 胡小刚朱强
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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