A Laser Additive Manufacturing Method for High Stability Particle Dispersion Strengthened Titanium Alloy

A technology of dispersion strengthening and high stability, which is applied in the field of titanium alloy materials, can solve problems such as poor fluidity of molten pool, and achieve excellent effects of creep and durability

Active Publication Date: 2021-12-07
北京煜鼎增材制造研究院股份有限公司
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Problems solved by technology

[0006] However, during the laser additive manufacturing process, due to the lack of agitation in the molten pool formed by the laser, the fluidity in the molten pool is not good, which easily causes the particles used for stability enhancement to segregate at the grain boundary and partially evenly distribute in the entire tissue.

Method used

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  • A Laser Additive Manufacturing Method for High Stability Particle Dispersion Strengthened Titanium Alloy
  • A Laser Additive Manufacturing Method for High Stability Particle Dispersion Strengthened Titanium Alloy
  • A Laser Additive Manufacturing Method for High Stability Particle Dispersion Strengthened Titanium Alloy

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Embodiment 1

[0035] (1) First, TC11 (its nominal composition is shown in Table 1 below, wt.%) is selected as the titanium alloy main body in the present invention, and Y, CaAl, and Th alloy powders of 150-300 μm are added to the TC11 alloy powder to obtain 500 g Mix the alloy powder and put it into a ball mill jar. In order to make Y, CaAl, and Th play a stable and strengthening role and avoid segregation that may be caused by their addition, the addition amount of Y, CaAl, and Th is respectively according to the TC11 alloy powder The mass ratio is 0.6wt.%-8wt.%. Add 500 g of 440C wear-resistant steel balls with a diameter of 20-130 mm, fill the tank with argon gas and seal the tank, so that the entire ball milling process can be carried out in an oxygen-free environment to avoid rapid oxidation of the fresh surface produced during ball milling; make the high-energy ball mill, First use 250 rpm premixing for 30 minutes to ensure that the alloy powder is evenly mixed, then use 600 rpm for h...

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Abstract

The invention discloses a laser additive manufacturing method for high-stability particle dispersion strengthened titanium alloy, comprising the following steps: 1) preparing nanocrystalline powder mixed with titanium alloy, Y, Ca, Al, and Th; 2) mixing The nanocrystalline powder is directly sent into the molten pool formed by the laser beam through the powder feeding tube; 3) The mixed gas of argon and oxygen is blown through the side blowing tube to stir the laser molten pool; 4) The laser beam, the powder feeding tube and the side The blowpipe oscillates synchronously for laser additive forming. In order to solve the high stability and uniformity of titanium alloy as a high-temperature alloy with dispersion-strengthened particles added, the present invention proposes to prepare nanocrystalline powder by high-energy ball milling process, and through reasonable control of powder feeding rate and gas feeding rate, combined with appropriate laser melting Deposition process parameters, so as to realize the excellent and high stability particle dispersion strengthened titanium alloy prepared by laser additive technology.

Description

technical field [0001] The invention relates to the technical field of titanium alloy materials, in particular to a laser additive manufacturing method for high-stability particle dispersion strengthened titanium alloy. Background technique [0002] With the advancement of science and technology and the rapid development of the aerospace industry, titanium alloys have become one of the lightweight structural materials widely used in the aerospace field due to a series of advantages such as low density, high specific strength, and excellent corrosion resistance. TC11 titanium alloy (nominal composition is Ti-6.5Al-3.5Mo-1.5Zr-0.3Si), is a heat-resistant titanium alloy of α-β type titanium alloy, the alloy also has good hot working processability (including conventional process Performance and superplasticity), can be welded and machined in various ways, its β heat treatment and isothermal forging have been extensively researched and developed rapidly. Through thermal deforma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/25B22F10/50B22F10/322B22F1/00B22F9/04B22F12/50B22F12/10B33Y10/00B33Y70/00B33Y40/00C22C32/00C22C14/00C22C1/05
CPCB22F10/25B22F10/50B22F10/322B22F9/04B22F12/50B22F12/10B33Y10/00B33Y70/00B33Y40/00C22C32/0031C22C14/00C22C1/05B22F2009/043Y02P10/25
Inventor 不公告发明人
Owner 北京煜鼎增材制造研究院股份有限公司
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