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Preparation method of high-compactness, high-hardness and high-abrasion-resistance Ti6Al4V blocky alloys

A high-density, high-hardness technology, applied in the field of additive manufacturing, can solve problems such as limited wear resistance, reduced hardness, and cumbersome process procedures, and achieve the effects of low surface roughness, high density, and high dimensional accuracy

Inactive Publication Date: 2019-03-29
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] "Selective laser melting of Ti based on powder properties" published by Sun Jianfeng et al. 6 al 4 V Surface Roughness Research" (China Laser, 2016(7): 98-107), the adopted scheme: 80W laser power, 200mm / s scanning speed, and an orthogonal stacking fault scanning strategy with a thickness of 0.02mm, the existing problems : The prepared single-melt channel sample has low density, and the molded part has irregular groove-like surface
[0006] In the article "Sliding wear of selective laser melting processed Ti6Al4V un der boundary lubrication conditions" (Wear, 2016) published by Zhu Y et al., it adopts the scheme of laser power -200W, scanning speed -600mm / s, layer thickness -50μm. Problem: Although the Ti prepared under this process 6 al 4 The hardness of V alloy can reach ~440HV, but it contains more hole defects, and the improvement of its wear resistance is extremely limited.
[0007] In the article "Microstructural evolution and microhardness of aselective-lase r-melted Ti–6Al–4V alloy after post heat treatments.Journal of Alloys&Compounds" (2016,672:643-652) published by WuSQ et al. Effect of different heat treatment systems on Ti 6 al 4 The influence of V alloy structure and properties, existing problems: obtaining Ti under the optimal heat treatment system 6 al 4 The microhardness of V alloy reaches up to 420HV, and the process procedure is cumbersome, which increases its preparation cost
[0008] Published by Zhang Qi, et al. "The influence of selective laser cladding and precision forging joint forming process on the microstructure and mechanical properties of Ti6Al4V alloy" (Transactions of Nonferrous Metals Society of China, 2017,27(5):1036- 1042) in the article, which adopts the scheme of SLM additive manufacturing and water quenching after precision forging, the existing problem: although the existence of voids is reduced under high strain rate and large deformation, the hardness is also reduced after water quenching
[0009] In summary, although different processes or post-treatment programs can be used to increase its density, improve structure and hardness, and wear resistance, they cannot be achieved at the same time.

Method used

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  • Preparation method of high-compactness, high-hardness and high-abrasion-resistance Ti6Al4V blocky alloys
  • Preparation method of high-compactness, high-hardness and high-abrasion-resistance Ti6Al4V blocky alloys
  • Preparation method of high-compactness, high-hardness and high-abrasion-resistance Ti6Al4V blocky alloys

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Experimental program
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Effect test

Embodiment 1

[0056] This embodiment provides a preparation method for preparing a high hardness and high wear resistance Ti6Al4V bulk alloy, the process of which is as follows:

[0057] 1) First, design the 3D model. After importing, the Eplus 3D printing software that comes with the EOS equipment will layer the 3D model at 0.03mm per layer, and build a 2mm support on the Ti6Al4V substrate. In this embodiment, CATIA software is used to design a three-dimensional model.

[0058] 2) Clean the 3D printer machine tool to ensure that it does not contain impurities and other metal powders, and correct the level of the scraper.

[0059] 3) The working cavity of the 3D printing machine tool is protected by the inert gas argon, and the pressure in the cavity is set to 0.4GPa.

[0060] 4), the Ti 6 Al 4 V substrate is heated to 70°C.

[0061] 5), such as figure 1 Shown: Using Ti 6 Al 4 The particle size of V alloy powder, its d(0.1)=23.644μm, d(0.5)=36.105μm, d(0.9)=54.721μm, its particle siz...

Embodiment 2

[0071] Based on the preparation process of the above-mentioned Example 1, for the preparation of a high-density, high-hardness, high-wear-resistant Ti 6 Al 4 V block alloy, different process parameters are used in this embodiment, the preheating temperature of the substrate is 80°C, the pressure in the cavity is set to 0.5GPa, and the process parameters of laser selective melting are as follows: laser power 260W, scanning speed 1.3m / s, the overlap ratio is 50 μm, and the Ti printed in this example 6 Al 4 V block alloy parts, the density reaches 99.9%, the hardness reaches 412HV, and the wear resistance is 0.37×10 - 3 mm 3 ·N -1 min -1 .

Embodiment 3

[0073] Based on the preparation process of the above-mentioned Example 1, for the preparation of a high-density, high-hardness, high-wear-resistant Ti 6 Al 4 V block alloy, different process parameters are used in this embodiment, the preheating temperature of the substrate is 90°C, the pressure in the cavity is set to 0.6GPa, and the process parameters of laser selective melting are set as follows: laser power 290W, scanning speed 1.4 m / s, the overlap rate is 60μm, and the Ti printed by this embodiment 6 Al 4 V block alloy parts, the density reaches 99.9%, the hardness reaches 410HV, and the wear resistance is 0.36×10 -3 mm 3 ·N -1 min -1 .

[0074] To obtain Ti by this preparation method 6 Al4 V bulk alloy for performance analysis:

[0075] Figure 3a , Figure 3b For the preparation of Ti 6 Al 4 Scanning electron micrographs of V bulk alloys, such as Figure 3a As shown in the electron microscopy photos, it can be seen that a checkerboard structure is formed pa...

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Abstract

The invention provides a preparation method of high-compactness, high-hardness and high-abrasion-resistance Ti6Al4V blocky alloys. The method comprises the steps that a 3D printer layers a three-dimensional mode according to the set layer thickness, builds a support and preheats a Ti6Al4V base board, Ti6Al4V alloy powder is loaded into a printing work cavity of the 3D printer and is spread out, then the Ti6Al4V alloy powder in a remaining powder cavity is sent into the printing work cavity and is spread out according to the layer thickness, after the Ti6Al4V alloy powder is spread out, the Ti6Al4V alloy powder is subjected to laser selective melting, and Ti6Al4V blocky alloy parts are obtained after printing is finished. The compactness of the prepared Ti6Al4V blocky alloy achieves 99.9%,the hardness is improved by 30-50% to achieve 400-440 HV compared with Ti6Al4V alloys in a rolled state, and the abrasion resistance is 1-5 times that of the Ti6Al4V alloys in the rolled state.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a high-density, high-hardness, high-wear-resistant Ti 6 Al 4 Preparation of V bulk alloys. Background technique [0002] Laser selective melting technology is a kind of additive manufacturing. It is a precision metal additive manufacturing technology that can form any complex functional parts. Directly driven by the CAD model, the accumulation of materials layer by layer or point by point to form solid parts is an emerging advanced manufacturing technology that has received widespread attention in recent years. [0003] Laser selective melting technology is a kind of additive manufacturing. Compared with traditional processing and manufacturing methods, it can manufacture shapes and complex parts that are difficult or difficult to process by traditional methods, and can effectively save materials and reduce processing procedures. Thereby greatly reducing production costs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00B22F3/105B33Y10/00B33Y70/00
CPCC22C1/0458C22C14/00B33Y10/00B33Y70/00B22F10/00B22F10/66B22F10/28B22F10/366B22F10/38B22F10/47Y02P10/25
Inventor 王俊鞠江康茂东高海燕周阳梁加淼何树先刘雅辉李敏张震
Owner SHANGHAI JIAO TONG UNIV
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