Method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting

A nickel-based superalloy and additive manufacturing technology, applied in additive manufacturing, additive processing, energy efficiency improvement and other directions, can solve problems such as alloy cracks, and achieve the effect of improving microhardness, good microstructure and mechanical properties

Inactive Publication Date: 2018-05-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of hot isostatic pressing and solution aging heat treatment of the cast nickel-based superalloy prepared by EBM, a large number of cracks appeared in the alloy under the strain time effect stress.

Method used

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  • Method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting
  • Method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting
  • Method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) DZ125 nickel-based superalloy samples were prepared using EBM additive manufacturing equipment, and the forming method was as follows figure 1 . The forming method is to manufacture layer by layer from bottom to top along the vertical direction. The electron beam scanning mode of each layer is serpentine scanning, and the scanning mode of the upper layer is perpendicular to the scanning direction of the next layer. The crack morphology and microstructure photos of DZ125 nickel-based superalloy prepared by EBM are as follows figure 2 . from figure 2 In (a), it can be seen that through EBM forming, there are microcracks inside the DZ125 nickel-based superalloy. from figure 2 (b) It can be seen that the γ' phase in the microstructure of DZ125 nickel-based superalloy has irregular morphology and uneven size distribution.

[0025] (2) By changing the EBM preparation parameters, that is, changing the electron beam scanning rate v, scanning current I and scanning l...

Embodiment 2

[0032] (1) take image 3 (c) and the EBM preparation parameters in Table 1c, the crack morphology and microstructure of the DZ125 sample after 1220 ° C, 2 h hot isostatic pressing are as follows Figure 4 (c)(d). from Figure 4 (c) It can be seen that after HIP treatment, the cracks are obviously eliminated. It shows that the process has a significant effect on eliminating cracks. from Figure 4 (d) It can be seen that the γ' morphology has a growing tendency after HIP treatment, and the size distribution is uneven, indicating that the process will affect the microstructure, so subsequent heat treatment is required to adjust the microstructure.

[0033] (2) After 1220°C, 15min solution treatment, and 860°C, 18h aging treatment, the crack morphology and microstructure photos are as follows Figure 5 (c)(d). from Figure 5 It can be seen from (c) that after this treatment process, the purpose of eliminating microscopic cracks in the EBM-formed nickel-based superalloy can ...

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Abstract

The invention discloses a method for removing microcracks from additive manufacturing nickel-base high-temperature alloy components manufactured by electron beam selective melting, and belongs to thetechnical field of high-temperature alloy and additive manufacturing. According to the method disclosed by the invention, additive manufacturing nickel-base high-temperature alloy is treated with heattreatment technologies, including hot isostatic pressing treatment, solid solution treatment and aging treatment in sequence, and compact additive manufacturing nickel-base high-temperature alloy materials without the microcracks can be prepared with the heat treatment technologies, and have excellent microstructure and mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloy and additive manufacturing, and relates to a method for eliminating microcracks of nickel-based high-temperature alloy parts manufactured by electron beam selective melting and additive manufacturing. Through the hot isostatic pressing and subsequent thermal process of the nickel-based superalloy prepared by electron beam selective melting, the internal cracks of the alloy parts can be eliminated, the microstructure can be adjusted, and the mechanical properties can be improved. Background technique [0002] High-energy beam additive manufacturing technology is the main development direction of rapid prototyping of metal parts. The additive manufacturing technology developed in recent years that uses 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/15B22F3/24C22F1/10B33Y10/00
CPCC22F1/10B22F3/15B22F3/24B33Y10/00B22F2998/10B22F2003/248B22F10/00B22F10/36B22F10/28B22F10/64Y02P10/25
Inventor 彭徽史玉亭郭洪波
Owner BEIHANG UNIV
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