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Heat Treatment Method for Improving Strength-Plasticity Matching Properties of SLM Forming TC4

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

Active Publication Date: 2019-02-22
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 Strength-Plasticity Matching Properties of SLM Forming TC4
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  • Heat Treatment Method for Improving Strength-Plasticity Matching Properties of SLM Forming TC4

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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 the strength-plasticity matching performance of SLM formed TC4, comprising the following steps: coating a layer of high-temperature anti-oxidation coating on the surface of the TC4 sample after SLM forming, and then putting it into a vacuum atmosphere furnace to evacuate to- 0.1Mpa, filled with argon gas with a purity of 99.99% to raise the vacuum to 0.015Mpa; heat the sample three times and cool it down three times; put the sample after the last cooling down into a hot 40% sodium hydroxide solution After taking it out, remove the high-temperature anti-oxidation coating on the surface of the sample in combination with the sandblasting process. The invention has reasonable design, simple heat treatment scheme and good 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 Patents(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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