Method for reducing cracks in titanium-aluminum alloy printed through selective laser melting

A technology of selective laser melting and titanium-aluminum alloy, which is applied in the direction of additive manufacturing and additive processing, can solve the problems that cracks are difficult to eliminate, no obvious progress has been made, and printed parts are easy to crack, so as to achieve thermal stress reduction, high strength, and enhanced The effect of toughness

Pending Publication Date: 2021-05-07
丹阳层现三维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing studies on selective laser melting of titanium-aluminum alloys all face the problem that cracks are difficult to eliminate and printed parts are easy to crack.
Therefore, no significant progress has been made in the research on reducing cracks in titanium-aluminum alloy formed by selective laser melting

Method used

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  • Method for reducing cracks in titanium-aluminum alloy printed through selective laser melting
  • Method for reducing cracks in titanium-aluminum alloy printed through selective laser melting
  • Method for reducing cracks in titanium-aluminum alloy printed through selective laser melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for reducing cracks in selective laser melting printing of Ti-48Al-2Cr-8Nb alloy.

[0034] (1) Using sponge titanium, high-purity aluminum, electrolytic chromium and niobium as raw materials, according to the atomic percentage Ti: 48%, Al: 48%, Nb: 8%, Cr: 2%, after repeated melting, casting diameter 40mm Ti-48Al-2Cr-8Nb bar stock;

[0035] (2) Under the protection of 99.95% high-purity argon gas, prepare spherical powder through induction atomization equipment without a crucible, and mechanically screen the powder within the range of 20-63 μm;

[0036] (3) Use a laser power of 170W, a scanning speed of 1100mm / s, a scanning distance of 85μm, a powder layer thickness of 40μm, and a laser scanning path set to multiple bending paths that are parallel to each other and aligned end to end and connected. Under this process parameter, the 3D model slicing of printed parts;

[0037] (4) Under the protection of high-purity argon gas, the gas i...

Embodiment 2

[0039] This embodiment provides a method for reducing cracks in selective laser melting printing of Ti-47Al-6Nb alloy.

[0040] (1) Using sponge titanium, high-purity aluminum and niobium as raw materials, according to the atomic percentage Ti: 47%, Al: 47%, Nb: 6%, after repeated melting for many times, cast a Ti-47Al-6Nb bar with a diameter of 40mm;

[0041] (2) Under the protection of argon, spherical powder is prepared by non-crucible induction atomization equipment, and the powder within the range of 20-63 μm is mechanically screened;

[0042] (3) Use a laser power of 180W, a scanning speed of 1000mm / s, a scanning distance of 90μm, a powder layer thickness of 40μm, and a laser scanning path set to multiple bending paths that are parallel to each other and aligned end to end and connected. Under this process parameter, the 3D model slicing of cuboid and stretched parts;

[0043] (4) Under the protection of high-purity argon gas, the gas is washed until the oxygen content ...

Embodiment 3

[0045] This example provides a failure case of reducing cracks in selective laser melting printing Ti-45Al-10Nb alloy.

[0046] (1) Using sponge titanium, high-purity aluminum and niobium as raw materials, according to the atomic percentage Ti: 45%, Al: 45%, Nb: 10%, after repeated melting for many times, cast a Ti-45Al-10Nb bar with a diameter of 40mm;

[0047] (2) Under the protection of argon, spherical powder is prepared by induction atomization equipment without a crucible, and the powder within the range of 10-63 μm is mechanically screened;

[0048] (3) Use a laser scanning speed of 1000mm / s, a scanning distance of 80μm, a powder layer thickness of 40μm, a laser power of 110W-155W, and a gradient of 5W. The corresponding serial numbers are 1-10. Under this process parameter, the cuboid Slice the 3D model;

[0049] (4) Under the protection of high-purity argon gas, the gas is washed until the oxygen content is lower than 300ppm. After the powder is preheated to 100°C, t...

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Abstract

The invention discloses a method for reducing cracks in titanium-aluminum alloy printed through selective laser melting. The method comprises the following steps that (1) high-niobium titanium-aluminum alloy spherical powder is prepared from a titanium-aluminum alloy bar containing a high-niobium component under the protection of inert gas, wherein the powder comprises 43-49 at% of aluminum element, 6-9 at% of niobium element, no more than 2 at% of trace elements and the balance titanium element; (2) selective laser melting is conducted under the protection of high-purity inert gas to form the titanium-aluminum alloy, wherein the scanning speed is higher than or equal to 1000 mm/s, and the thickness of a powder layer is 20-40 microns; and (3) after forming is finished, a titanium-aluminum alloy formed part is obtained after natural cooling, wherein the microstructure of the titanium-aluminum alloy formed part is homogenized into an alpha2 phase, and the volume fraction of the alpha2 phase is larger than or equal to 90%. According to the method, the residual stress caused by the difference of thermal expansion coefficients among different phase regions is reduced, the microstructure of the titanium-aluminum alloy shows high strength and toughness, grains are fine, and therefore cracks are inhibited.

Description

technical field [0001] The invention relates to a method for reducing cracks in selected area laser melting and printing titanium-aluminum alloys, belonging to the field of 3D printing of metal materials. Background technique [0002] Titanium-aluminum-based intermetallic compounds are considered to be ideal substitutes for nickel-based superalloys due to their high creep and oxidation resistance, high elastic modulus and low density, and are the preferred materials for hypersonic vehicles and advanced aero-engines. It is currently the focus of research on lightweight superalloys, which are used in aerospace, automobile industry and other fields. However, titanium-aluminum-based intermetallic compounds have poor room temperature plasticity, high difficulty in forming, and difficult forming. At present, the main processing method in China is precision casting, and then the method of eliminating shrinkage cavity by hot isostatic pressing. However, ingot casting technology ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28C22C14/00B33Y10/00
CPCC22C14/00B33Y10/00
Inventor 杜宇雷王茂松蔡建宁李京晓
Owner 丹阳层现三维科技有限公司
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