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Laser additive manufacturing method capable of reducing cracking sensitivity

A technology of laser additive manufacturing and manufacturing methods, applied in the direction of additive manufacturing, additive processing, etc., can solve the problems of reducing the manufacturing efficiency of laser additive manufacturing technology, the difficulty of controlling the consistency of tissue performance, and the complicated and cumbersome turnover process, etc., to achieve stress The accumulation level is autonomously controllable, ensuring the consistency of organization and performance, and reducing the effect of cracking sensitivity

Pending Publication Date: 2021-03-30
CAPITAL AEROSPACE MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has connecting areas and segmented bonding interfaces, and it is difficult to control the consistency of tissue properties with other parts. At the same time, it must cooperate with special tooling, interspersed with multiple heat treatments, and removal of oxide layers. The turnover process is complicated and cumbersome, and the production cycle is long. Reduce Improve the manufacturing efficiency of laser additive manufacturing technology

Method used

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  • Laser additive manufacturing method capable of reducing cracking sensitivity
  • Laser additive manufacturing method capable of reducing cracking sensitivity
  • Laser additive manufacturing method capable of reducing cracking sensitivity

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as Figure 1-2 As shown, taking laser additive manufacturing of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy as an example, a laser additive manufacturing method that reduces crack sensitivity is characterized in that it includes the following steps:

[0024] In the first step, the titanium alloy powder with a particle size specification of 60-150 μm is loaded into the powder feeder, and the oxygen content in the powder must be greater than 0.08wt%;

[0025] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas with a purity of 99.999%;

[0026] In the third step, when the argon oxygen content in the working room is less than 50ppm, the titanium alloy additive manufacturing is started; under the action of the laser, the synchronously fed titanium alloy powder is continuously melted and deposited on the substrate;

[0027] The fourth step is to remove the laser powder feeding head after continuously depositing...

Embodiment 2

[0032] Such as Figure 1-2 As shown, taking laser additive manufacturing of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy as an example, a laser additive manufacturing method that reduces crack sensitivity includes the following steps:

[0033] In the first step, the titanium alloy powder with a particle size specification of 60-150 μm is loaded into the powder feeder, and the oxygen content in the powder must be greater than 0.08wt%;

[0034] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas with a purity of 99.999%;

[0035]In the third step, when the argon oxygen content in the working room is less than 50ppm, the titanium alloy additive manufacturing is started; under the action of the laser, the synchronously fed titanium alloy powder is continuously melted and deposited on the substrate; during the deposition process, through the control The energy density in the deposition area is 41~50J / mm 2 , the width-to-he...

Embodiment 3

[0041] Such as Figure 1-2 As shown, taking laser additive manufacturing of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy as an example, a laser additive manufacturing method that reduces crack sensitivity is characterized in that it includes the following steps:

[0042] In the first step, the titanium alloy powder with a particle size specification of 60-150 μm is loaded into the powder feeder, and the oxygen content in the powder must be greater than 0.08wt%;

[0043] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas with a purity of 99.999%;

[0044] In the third step, when the argon oxygen content in the working room is less than 50ppm, the titanium alloy additive manufacturing is started; under the action of the laser, the synchronously fed titanium alloy powder is continuously melted and deposited on the substrate; during the deposition process, through the control The energy density in the deposition area is 4...

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Abstract

The invention provides a laser additive manufacturing method capable of reducing cracking sensitivity. Internal stress and distortion energy are preset, laser synchronous heat treatment is cooperatively coupled, the recrystallization scale in the continuous deposition forming process is controlled, the internal stress is moderately released on line, a long-strip-shaped continuous grain boundary alpha is converted into a broken line shape or an interrupted shape, the stress level and the cracking sensitivity are reduced, and meanwhile, the plasticity reserve of a deposited component is improvedby controlling the recrystallization degree, the anti-cracking capacity under high stress is improved, cracking-free one-time continuous forming of a large titanium alloy additive manufacturing component can be conveniently achieved through a short process, subsequent heat treatment is not needed for regulating and controlling the structure performance, and direct engineering application can be achieved.

Description

technical field [0001] The invention relates to the field of laser processing of metal materials, in particular to a laser additive manufacturing method for reducing crack sensitivity. Background technique [0002] Laser additive manufacturing of large titanium alloy components has a large temperature gradient, high cooling rate, long continuous deposition time, internal mechanical restraint stress, solid phase transition stress, solidification shrinkage stress and thermal stress, etc. Severe warping deformation and macroscopic cracking occurred during the process. On the other hand, the titanium alloy components manufactured by laser additive manufacturing have a columnar grain structure macroscopically, and the columnar grain boundaries are all long continuous grain boundaries α, which are extremely easy to crack under long-term stress, and belong to the extremely easy cracking position. The macroscopic cracking caused by the above two reasons is difficult to control, whi...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F10/64B33Y10/00B33Y40/20B33Y70/00C22C14/00C22F1/18C22F1/02
CPCB22F3/24C22C14/00B33Y10/00B33Y40/20B33Y70/00C22F1/183C22F1/02B22F2003/248Y02P10/25
Inventor 谢勇周庆军严振宇王福德
Owner CAPITAL AEROSPACE MACHINERY
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