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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  • 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 the microcracks in the workpiece are eliminated; however, through the composition 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 sys

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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

Examples

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Example Embodiment

[0044]Example 1

[0045]This embodiment provides a method of eliminating the crack in a metal material, and samples A and B are treated;

[0046]The sample A, B is placed in the heat treatment furnace, and the furnace is evacuated to the furnace to inhibit the sample oxidation. The sample is raised to 1285 ° C, the temperature rise rate is 10 ° C / min, and the target temperature is raised to the target temperature. After 5 min, then after cooling at a rate of 2 ° C / min, it was carried out at a rate of 2 ° C / min, that is, the pressure of the thermatic pressure treatment of the heat is 0 MPa, and finally the furnace is cooled to room temperature, and the sample is removed;

[0047]The density value of the sample A (after treatment) was tested using an Aqui Mide density test method. At this time, its density is increased to 99.86%.figure 2 Contrast the density before and after the sample A processes.

[0048]It was analyzed by X-CT test technology to analyze the sample B (after treatment) int...

Example Embodiment

[0050]Example 2

[0051]This embodiment provides a method of eliminating the crack in a metal material, and the sample C and D are treated;

[0052]The sample C and D were placed in the heat treatment furnace. After the furnace was evacuated, high-purity argon was introduced into the sample oxidation. The sample was raised to 1285 ° C, the temperature increase rate was 10 ° C / min, and the target temperature was insulated. After 5 minutes, the static pressure was started by pressure, and the static pressure was 7 MPa and the booster rate was 2.5 MPa / min. The post-rear pressure is constant and cooled to 1200 ° C at a rate of 2 ° C / min, and then cooled to room temperature, remove the sample;

[0053]The density value of the sample C (after treatment) was tested by the Aqui Mide density test method. At this time, the density was increased to 99.99%.Figure 4 Contracted the density before and after the sample C treatment.

[0054]The X-CT test technology was used to analyze the sample D (after ...

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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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