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A method for in-situ heat treatment of metal parts manufactured by electron beam selective melting and additive manufacturing

A technology of additive manufacturing and selective melting, which is applied in the direction of additive manufacturing, improvement of process efficiency, improvement of energy efficiency, etc., can solve the problems of increased manufacturing costs, achieve the effect of improving surface finish and eliminating microscopic holes

Active Publication Date: 2017-10-31
成都航大新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But HIP processing will lead to increased manufacturing costs

Method used

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  • A method for in-situ heat treatment of metal parts manufactured by electron beam selective melting and additive manufacturing
  • A method for in-situ heat treatment of metal parts manufactured by electron beam selective melting and additive manufacturing
  • A method for in-situ heat treatment of metal parts manufactured by electron beam selective melting and additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: In-situ heat treatment of TC4 alloy

[0027] EBM equipment is used to process six TC4 alloy test blocks at the same time, and the size is 20mm×20mm×80mm. One of the test blocks was processed by the normal process, the electron beam current was 4.5mA, the scanning speed was 700m / s, the Focus Offset value was 3, and no secondary remelting in-situ heat treatment was performed. For the remaining 5 test blocks, the electron beam Focus Offset values ​​were set to 3, 10, 20, 40, and 60 for in-situ remelting treatment, and the electron beam current and scanning speed were not changed during the remelting process. figure 2 It is the surface morphology of TC4 alloy treated with different processing parameters. from figure 2 In (a), it can be seen that there are obvious electron beam scanning traces on the surface of the unremelted sample. After the second remelting treatment, the surface state of the sample changes, and the surface of the sample obtained when the ...

Embodiment 2

[0031] Example 2: In-situ heat treatment of Inconel625 alloy

[0032] EBM equipment is used to process 4 pieces of Inconel625 alloy test blocks at the same time, and the sizes are all One of them (denoted as 1# test block) was processed by normal process, the processing electron beam current was 4.5mA, the scanning speed was 500m / s, the Focus Offset value was 20, and no secondary remelting in-situ heat treatment was performed. The parameters of the in-situ heat treatment for the other two test blocks were respectively: the electron beam current was 4.5mA, the scanning speed was 1000m / s, and the Focus Offset value was 20 (denoted as 2# test block); the electron beam current was 4.5mA, and the scanning speed was 400m / s, Focus Offset value is 40 (recorded as 3# test block). Image 6 The cross-sectional metallographic pictures and Figure 7 The electron backscatter diffraction (EBSD) images are the microscopic analysis results of the Inconel625 alloy before and after the remelt...

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Abstract

The invention discloses a method for realizing in-situ heat treatment of metal parts manufactured by electron beam selective melting and additive manufacturing, and relates to the technical fields of additive manufacturing and heat treatment. The present invention adds a second heating and remelting step after the melting step of the forming area to melt the forming area. The secondary heating and remelting parameters include electron beam scanning speed, electron beam current, scanning offset and focal spot size. The invention can implement in-situ heat treatment during the processing and molding process of the parts, thereby eliminating some microscopic holes in the parts, and at the same time can improve the surface finish of the parts, realize the control of the microstructure and realize the regulation and control of the mechanical properties of the formed parts within a certain range.

Description

technical field [0001] The invention relates to a method for in-situ heat treatment of additively manufactured metal parts, in particular to a method for in-situ heat treatment of electron beam selective melting and additively manufactured metal parts. By performing in-situ heating or remelting heat treatment on metal parts during the forming process, some microscopic holes can be eliminated, the surface finish of the parts can be improved, and the microstructure can be adjusted, so as to realize the regulation of the mechanical properties of the formed parts within a certain range. Background technique [0002] High-energy beam 3D printing technology is the main development direction of rapid prototyping of metal parts. The 3D printing technology developed in recent years using high-energy beams (electron beams, laser beams, plasma beams, etc.) as heat sources is the main development direction for rapid prototyping of metal parts, which can greatly improve the production ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F3/24
CPCB22F3/24B22F2003/248B22F10/00B22F10/364B22F10/28B22F10/366B22F10/362Y02P10/25
Inventor 彭徽郭洪波汤一彪宫声凯徐惠彬
Owner 成都航大新材料有限公司
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