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Preparation method capable of synchronously improving strength and plasticity of additive manufactured titanium alloy

An additive manufacturing and titanium alloy technology, which is applied in the field of preparation that can simultaneously improve the strength and plasticity of additively manufactured titanium alloys, can solve problems such as reducing material strength, reduce plug stress, hinder dislocation movement, and reduce dislocation. The effect of wrong slip length

Active Publication Date: 2017-04-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

An unavoidable disadvantage of this method is that it reduces the strength of the material
At present, in the field of additive manufacturing, there is no technical method that can simultaneously improve the strength and plasticity of titanium alloys

Method used

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  • Preparation method capable of synchronously improving strength and plasticity of additive manufactured titanium alloy
  • Preparation method capable of synchronously improving strength and plasticity of additive manufactured titanium alloy
  • Preparation method capable of synchronously improving strength and plasticity of additive manufactured titanium alloy

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0027] Specifically, the invention improves the strength and plasticity of the titanium alloy by forming the α / β interface phase during the laser cladding deposition and selective laser melting process of additive manufacturing, and its effect is similar to "fine grain strengthening"; it can be used for strengthening and toughening The preparation of titanium alloy material provides a preparation method for the strengthening and toughening of titanium alloy (Ti-6Al-4V) by additive manufacturing.

[0028] Among the present invention, the Ti-6Al-4V titanium alloy is realized in this way: in an argon-filled inert atmosphere protection chamber, with a high-energy all-solid-state laser as a laser source, the Ti-6Al-4V (O≤0.20wt.%) ) alloy powders were continuously melted and deposited layer by lay...

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Abstract

The invention discloses a preparation method capable of synchronously improving strength and plasticity of an additive manufactured titanium alloy. The preparation method comprises the following steps: (1) Ti-6Al-4V alloy powder with a particle size of -90-+325 meshes is put in a powder feeder, wherein the oxygen content of the powder is not higher than 0.20 wt.%; (2) a substrate is fixed on a worktable of an argon-charged inert atmosphere machining chamber; (3) in the argon-charged inert atmosphere machining chamber, when the oxygen content is lower than 100 ppm, a titanium alloy is formed through additive manufacturing; and (4) under the effect of a laser source, the synchronously fed Ti-6Al-4V alloy powder is continuously molten and deposited on the substrate; in the deposition process, the energy density of the deposition area and the size of the deposition area are controlled to obtain 103-104 k / s cooling speed in the liquid-solid transformation process and to obtain 100-400 k / s cooling speed in the process of converting from a beta phase to an alpha phase; and a Ti-6Al-4V alloy part with an alpha / beta interface phase is prepared.

Description

technical field [0001] The invention relates to the field of advanced manufacturing of metal materials, in particular to a preparation method capable of simultaneously improving the strength and plasticity of titanium alloys manufactured by additive manufacturing. Background technique [0002] Due to the advantages of high specific strength, good thermal strength, and corrosion resistance, titanium alloys are widely used in aviation, aerospace, navigation and other industrial fields. α phase and β phase are two phases that exist stably in titanium alloy (Ti-6Al-4V) at room temperature, and their ratio, shape, distribution, etc. determine the performance of titanium alloy. Traditional manufacturing techniques (such as forging) usually use a suitable process route to adjust the proportion, morphology and distribution of α-phase and β-phase, so as to achieve the best organizational state to meet the use requirements. Due to the rapid heating and cooling characteristics of lase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/77B22F10/25B22F10/366B22F12/41B22F10/36B22F10/38B22F10/32Y02P10/25
Inventor 赵庄陈静隋尚谭华林鑫黄卫东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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