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Heat treatment method for improving SLM forming TC4 strength-plasticity matching performance

A heat treatment method and matching performance technology, applied in the direction of energy efficiency improvement, process efficiency improvement, additive manufacturing, etc., can solve the problems of plasticity difference, strength-plasticity matching performance difficult to meet the requirements of industrial engineering applications, and small plasticity improvement.

Active Publication Date: 2017-07-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For SLM forming TC4 titanium alloy parts, the traditional heat treatment process can achieve plasticity improvement, but the plasticity improvement is small, and the strength-plasticity matching performance is difficult to meet the requirements of industrial engineering applications
Bey Vrancken, Lore Thijs et al performed 850℃ / 2h / FC heat treatment on SLM forming TC4, which increased the elongation of the sample from 7.36±1.32% to 12.84±1.36%; 20℃ / 90min / AC annealing treatment, the elongation of the sample reaches 11.0-13.0%; but the plasticity of the sample still has a certain difference from the traditional forging and casting

Method used

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  • Heat treatment method for improving SLM forming TC4 strength-plasticity matching performance
  • Heat treatment method for improving SLM forming TC4 strength-plasticity matching performance
  • Heat treatment method for improving SLM forming TC4 strength-plasticity matching performance

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Experimental program
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Effect test

Embodiment 1

[0030] The Ti-6Al-4V powder particles with an average particle size of 45 μm and the composition shown in the parameter attached table 1 are used as the raw material for SLM forming. According to the process parameters shown in the parameter attached table 2, the forming size specification is 644mm, and the diameter of the working section is 3mm. Tensile specimen with a gauge length of 15mm, the specific size parameters are attached figure 2 .

[0031] Parameter Schedule 1

[0032]

[0033] Parameter Schedule 2

[0034]

[0035]

[0036] Use the wire cutting process to separate the tensile sample from the substrate, and then uniformly dip-coat a layer with a thickness of 0.2-0.3mm on the surface of the tensile sample, bonded by alumina, silicon oxide, boron carbide refractory and silicate High temperature anti-oxidation coating composed of additives.

[0037] Put the sample coated with high-temperature anti-oxidation coating into a vacuum atmosphere furnace, evacu...

Embodiment 2

[0044] The Ti-6Al-4V powder particles with an average particle size of 45 μm and the composition shown in the parameter attached table 1 are used as the raw material for SLM forming. According to the process parameters shown in the parameter attached table 2, the forming size specification is 644mm, and the diameter of the working section is 3mm. Tensile specimen with a gauge length of 15mm, the specific size parameters are attached figure 2 .

[0045] Parameter Schedule 1

[0046]

[0047] Parameter Schedule 2

[0048]

[0049]Use the wire cutting process to separate the tensile sample from the substrate, and then uniformly dip-coat a layer with a thickness of 0.2-0.3mm on the surface of the tensile sample, bonded by alumina, silicon oxide, boron carbide refractory and silicate High temperature anti-oxidation coating composed of additives.

[0050] Put the sample coated with high-temperature anti-oxidation coating into a vacuum atmosphere furnace, evacuate until the...

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Abstract

The invention provides a heat treatment method for improving SLM forming TC4 strength-plasticity matching performance. The heat treatment method comprises the following steps that the surface of a TC4 sample obtained after SLM forming is coated with a high-temperature anti-oxidization coating, then the TC4 sample is put into a vacuum atmosphere furnace to be vacuumized to -0.1 Mpa and is filled with argon with the purity being 99.99%, and vacuum is increased to 0.015 Mpa; the sample is subjected to three times of heating and three times of cooling; and the sample obtained after the last time of cooling is put into a hot 40% sodium hydroxide solution, and after the sample is taken out, the high-temperature anti-oxidization coating on the surface of the sample is removed through combination with a sand blast process. The heat treatment method is reasonable in design, simple in heat treatment scheme and good in heat treatment effect.

Description

technical field [0001] The invention relates to a selective laser melting (Selective Laser Melting, SLM) forming process and a titanium alloy heat treatment process, in particular to a heat treatment method for improving the strength-plasticity matching performance of SLM formed Ti-6Al-4V (TC4). Background technique [0002] Ti-6Al-4V (TC4) titanium alloy is widely used in aerospace, shipbuilding, chemical industry, weapons, medical treatment, automobile and other fields due to its high specific strength, good corrosion resistance and high heat resistance. However, the traditional forging and casting process has problems such as time-consuming and long cycle when processing complex titanium alloy parts, so it is necessary to seek new processes and methods. [0003] SLM laser selective melting technology is an additive manufacturing technology that emerged in the 1990s. It can use lasers to quickly melt metal powder according to a certain scanning strategy based on the three-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/02C22C14/00B22F3/105B22F3/24B33Y10/00B33Y40/00
CPCC22C14/00C22F1/008C22F1/02C22F1/183B22F3/24B33Y10/00B33Y40/00B22F2003/248B22F2998/10B22F10/00B22F10/66B22F10/366B22F10/28B22F10/64B22F2201/11Y02P10/25
Inventor 廖文和肖振楠刘婷婷张长东杨涛段声勤
Owner NANJING UNIV OF SCI & TECH
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