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A process control method for laser 3D printing of aluminum alloy modified by rare earth with low element burning loss

A rare earth modification and 3D printing technology, applied in the field of aluminum alloy materials, can solve the problems of difficult rapid heat conduction, rare earth element evaporation burning, rare earth element burning, etc., to improve the flow spreading performance, effectively control and reduce, reduce The effect of evaporative burn loss

Active Publication Date: 2019-09-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been corresponding literature reports on the SLM technology forming of rare earth reinforced aluminum-magnesium alloys. However, the unavoidable problem is the burning problem faced by rare earth elements.
The burning loss of rare earth elements comes from two aspects, one is oxidation burning loss, rare earth elements are extremely active, and are easy to combine with oxygen impurities in the powder or residual oxygen content in the forming cavity to form oxides, which leads to the inclusion of formed samples Pores and performance deterioration; on the other hand, due to evaporation or volatile burning, the laser energy used in SLM forming has a Gaussian distribution, and the center energy is very high. Due to the powder bed forming, the heat is not easy to conduct and dissipate quickly. Using the traditional linear scanning strategy can easily lead to Local heat accumulation generates high temperature, which in turn causes evaporation and burning of rare earth elements

Method used

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  • A process control method for laser 3D printing of aluminum alloy modified by rare earth with low element burning loss
  • A process control method for laser 3D printing of aluminum alloy modified by rare earth with low element burning loss
  • A process control method for laser 3D printing of aluminum alloy modified by rare earth with low element burning loss

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Embodiment 1

[0049] The present invention is a process control method for laser 3D printing of rare earth modified and enhanced aluminum alloy with low element burning loss, including powder spreading and laser scanning; specifically, it includes the following steps:

[0050] (1) Establish a three-dimensional model of the formed sample and carry out path planning; the laser scanning strategy adopted includes: using 2mm×2mm partitions, continuous scanning areas are separated by 4 blocks, and the pause at the end of each scanning vector is Δt=0.02s.

[0051] (2) The layered slicing model is imported into the industrial computer of the forming equipment.

[0052] (3) Adjust the forming substrate so that the focal plane is Δh=1700 μm below the forming substrate.

[0053] (4) The pre-alloyed powder is pretreated, the atmosphere used is hydrogen plus argon, the hydrogen content is 10%, the heating temperature is 120°C, and the holding time is 4h.

[0054] (5) Quickly pour pre-alloyed powder (al...

Embodiment 2

[0061] The present invention is a process control method for laser 3D printing of rare earth modified and enhanced aluminum alloy with low element burning loss, including powder spreading and laser scanning; specifically, it includes the following steps:

[0062] (1) Establish a three-dimensional model of the formed sample and perform path planning; the laser scanning strategy adopted includes: using 2mm×2mm partitions, continuous scanning areas are separated by 3 blocks, and the pause at the end of each scanning vector is Δt=0.03s.

[0063] (2) The layered slicing model is imported into the industrial computer of the forming equipment.

[0064] (3) Adjust the forming substrate so that the focal plane is Δh=1600 μm below the forming substrate.

[0065] (4) The pre-alloyed powder is pretreated, the atmosphere used is hydrogen plus argon, the hydrogen content is 15%, the heating temperature is 130°C, and the holding time is 3h.

[0066] (5) Pour the powder quickly, close the ca...

Embodiment 3

[0072] The present invention is a process control method for laser 3D printing of rare earth modified and enhanced aluminum alloy with low element burning loss, including powder spreading and laser scanning; specifically, it includes the following steps:

[0073] (1) Establish a three-dimensional model of the formed sample for path planning. The laser scanning strategy adopted includes: using 2mm×2mm partitions, continuous scanning areas are separated by 2 blocks, and the end of each scanning vector is paused

[0074] Δt = 0.05s.

[0075] (2) The layered slicing model is imported into the industrial computer of the forming equipment.

[0076] (3) Adjust the forming substrate so that the focal plane is Δh=1500 μm below the forming substrate.

[0077] (4) The pre-alloyed powder is pretreated, the atmosphere used is hydrogen plus argon, the hydrogen content is 20%, the heating temperature is 150°C, and the holding time is 2h.

[0078] (5) Pour the powder quickly, close the cav...

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Abstract

The invention belongs to the field of aluminum alloy materials, and relates to a process control method for laser 3D printing of aluminum alloys modified and enhanced by low-element burning loss, including powder spreading and laser scanning; Defocus scanning is carried out in combination of the three; wherein, the partition differential scanning is to uniformly partition the two-dimensional scanning area to obtain a number of scanning blocks, and the block interval scanning is adopted during the scanning process; the intermittent Scanning means that during the scanning process, the laser beam stops scanning every time it travels a scanning vector distance, cools down for a period of time, and then continues scanning; the defocused scanning is to change the focal plane of the laser beam so that the focal plane is located below the formed substrate. It achieves effective control of the temperature of the molten pool in the laser 3D printing process through process regulation methods, and at the same time solves the problem of burning elements in laser additive manufacturing.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and relates to a process control method for laser 3D printing of aluminum alloy modified and enhanced by rare earth with low element burning loss, in particular to a 3D printing process capable of realizing low element burning loss. Background technique [0002] Due to its high specific strength and plasticity, good thermal and electrical conductivity and corrosion resistance, aluminum alloys are widely used in aerospace, traffic lights, ships and other industrial fields. In order to further improve the strength of aluminum alloy, it is usually achieved by adding trace elements to form fine dispersed precipitates in the matrix. Among them, the addition of rare earth elements is particularly significant. It can not only form fine precipitates, but also effectively improve the metallographic structure of the alloy, refine the grains, remove gases and harmful impurities in the alloy, reduce t...

Claims

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Application Information

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IPC IPC(8): B22F3/105C22C21/06
CPCC22C21/06B22F10/00B22F10/32B22F10/366B22F10/368B22F10/28Y02P10/25
Inventor 顾冬冬马成龙石齐民杨建凯张晗
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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