Heat treatment method for improving defects in additive manufacturing of beta-type titanium alloy

A heat treatment method and additive manufacturing technology, applied in the field of additive manufacturing, can solve the problems of complex process, accumulation of process processes, increase of manufacturing cycle and cost, etc., to achieve the effect of simple process flow, improved strength, and reduced anisotropy

Pending Publication Date: 2022-04-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the invention still has the following problems: it involves the accumulation of various processes, multiple heat treatments such as heating and heat preservation increase the manufacturing cycle and cost, and the process is relatively complicated.

Method used

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  • Heat treatment method for improving defects in additive manufacturing of beta-type titanium alloy
  • Heat treatment method for improving defects in additive manufacturing of beta-type titanium alloy
  • Heat treatment method for improving defects in additive manufacturing of beta-type titanium alloy

Examples

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Embodiment 1

[0048] This embodiment provides a heat treatment method for improving defects in additively manufactured β-type titanium alloys. The Ti-41Nb alloy used in this embodiment is obtained through a selective laser melting process. The specific parameters for processing the Ti-41Nb alloy are: using TruPrint1000 instrument , power 120W, scanning speed 900mm / s, scanning distance 80 microns, layer thickness 20 microns. The microstructure analysis of Ti-41Nb alloy found that it contains obvious defects such as undissolved particles and pores, and the original structure has a large number of {001} oriented columnar grains parallel to the construction direction.

[0049] The melting point of Ti-41Nb alloy under normal pressure is about 1800°C. The Ti-41Nb alloy is pressurized at 4GPa with a six-sided top press and heated to 1000°C. A β-type titanium alloy with dense and significantly improved compressive yield strength.

[0050] refer to figure 2 , image 3 as shown, figure 2 It is ...

Embodiment 2

[0054] This embodiment provides a heat treatment method for improving defects in additively manufactured β-type Ti-15Mo alloys. The Ti-15Mo alloy used in this embodiment is obtained through a selective laser melting process. The specific parameters for processing the Ti-15Mo alloy are: TruPrint1000 instrument, power 130W, scanning speed 900mm / s, scanning distance 80 microns, layer thickness 20 microns. The support structure was added during the construction process, and the thermal accumulation effect was strengthened. The microstructure analysis found that it contained obvious defects such as undissolved and pores, and there were a large number of {001}-oriented columnar crystals parallel to the construction direction in the original structure.

[0055] The melting point of the Ti-15Mo alloy under normal pressure is about 1800°C. The Ti-15Mo alloy is pressurized at 6GPa with a six-sided top press and heated to 900°C. Ti-Mo alloy with dense and significantly improved compressi...

Embodiment 3

[0058] This example provides a heat treatment method for improving the anisotropy in additively manufactured β-type Ti-36Nb-2Ta-3Zr-0.3O alloy. The Ti-36Nb-2Ta-3Zr-0.3O alloy used in this example passes through the selection Obtained by laser melting process, the specific parameters for processing Ti-36Nb-2Ta-3Zr-0.3O alloy are: using TruPrint1000 instrument, power 170W, scanning speed 300mm / s, scanning distance 80 microns, layer thickness 20 microns. The support structure was added during the construction process, and the thermal accumulation effect was strengthened. The microstructure analysis found that it contained obvious defects such as pores, and there were a large number of {001}-oriented columnar crystals parallel to the construction direction in the original structure.

[0059] The Ti-36Nb-2Ta-3Zr-0.3O alloy was pressurized at 6GPa with a six-sided top press and heated to 1500°C. After holding the pressure for 20 minutes, it was cooled by water to obtain a compact str...

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Abstract

The invention provides a heat treatment method for improving defects in an additive manufacturing beta-type titanium alloy, which comprises the following steps: providing the additive manufacturing beta-type titanium alloy, and the additive manufacturing beta-type titanium alloy contains the defects of pores and undissolved particles; the additive manufacturing beta-type titanium alloy is pressurized to preset pressure, and after the additive manufacturing beta-type titanium alloy is heated to preset temperature, the additive manufacturing beta-type titanium alloy is subjected to heat treatment; and cooling treatment is conducted, and the beta-type titanium alloy compact in structure is obtained. The method is simple in technological process, short in period, low in cost and small in subsequent machining allowance, defects are effectively improved on the basis of additive manufacturing of the beta-type titanium alloy, meanwhile, the structure can be improved and weakened through heat treatment, the anisotropy of the material is reduced, and then the strength, plasticity, fatigue resistance and other performance of the beta-type titanium alloy are improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a heat treatment method for improving defects in additively manufactured β-type titanium alloys. Background technique [0002] At present, due to its layer-by-layer superimposed deposition and fast cooling rate, additive manufacturing metal materials generally have better comprehensive performance compared with metals prepared by traditional preparation methods, so that they are widely used in aerospace, medical plants, etc. There are better application prospects in other fields. [0003] But at the same time, there are also some problems in the additive manufacturing of β-type titanium alloys, which limit its further application to a certain extent. On the one hand, similar to traditional casting parts, additive manufacturing of β-type titanium alloys will also have defects such as pores, cracks, and undissolved particles, which will adversely affect the subseque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18B22F10/64C22C14/00B33Y40/20B33Y70/00
CPCC22F1/183B22F10/64C22C14/00B33Y40/20B33Y70/00
Inventor 董安平李仲杰蔡学成邢辉许浩何林杜大帆孙宝德
Owner SHANGHAI JIAO TONG UNIV
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