Method for preparing TC4/TiAl gradient material through laser synchronous powder feeding

A laser synchronous powder feeding and gradient material technology, applied in metal material coating process, additive manufacturing, additive processing, etc., can solve the problems of high temperature gradient, difficult TC4 substrate, large residual stress, etc., and achieve high energy density, High performance, fine tissue effect

Inactive Publication Date: 2020-06-05
SHENYANG POLYTECHNIC UNIV
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a method for preparing TC4 / TiAl gradient materials by laser synchronous powder feeding, which is mainly used to solve the problem of macroscopic cracks caused by high temperature gradient and large residual stress in the existing preparation process, making it difficult to prepare TiAl alloys on TC4 substrates The problem

Method used

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  • Method for preparing TC4/TiAl gradient material through laser synchronous powder feeding
  • Method for preparing TC4/TiAl gradient material through laser synchronous powder feeding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The steps of this method are:

[0048] Step 1: Weigh the TC4 alloy powder and Ti-48Al-2Cr-2Nb alloy powder according to the mass fraction ratio of 4:1, 3:2, 2:3 and 1:4 respectively, and mix them mechanically for 2 hours to obtain the mixed powder. The particle size of the powder is 50-150 μm;

[0049] Step 2: Use an electric grinder to polish the surface of the TC4 titanium alloy substrate to remove the oxide film, wipe the surface of the substrate with alcohol to remove oil, and then put it into the laser 3D printing equipment (LDM8060 laser synchronization produced by Nanjing Zhongke Yuchen Laser Technology Co., Ltd. powder feeding additive manufacturing equipment), the size of TC4 substrate is 100mm×100mm×10mm;

[0050] Step 3: Put the alloy powder in step 1 into a vacuum drying oven for drying treatment at 150°C / 2h, and then use a pneumatic powder feeder to send the alloy powder into the laser cladding head;

[0051] Step 4: Form 5 layers of 80% TC4 + 20% TiAl gr...

Embodiment 2

[0054] The steps of this method are:

[0055] Step 1: Weigh the TC4 alloy powder and Ti-48Al-2Cr-2Nb alloy powder according to the mass fraction ratio of 4:1, 3:2, 2:3 and 1:4 respectively, and mix them mechanically for 3 hours to obtain the mixed powder. The particle size of the powder is 50-150 μm;

[0056] Step 2: Use an electric grinder to polish the surface of the TC4 titanium alloy substrate to remove the oxide film, wipe the surface of the substrate with alcohol to remove oil, and then put it into the laser 3D printing equipment (LDM8060 laser synchronization produced by Nanjing Zhongke Yuchen Laser Technology Co., Ltd. powder feeding additive manufacturing equipment), the size of TC4 substrate is 100mm×100mm×10mm;

[0057] Step 3: Put the alloy powder in step 1 into a vacuum drying oven for drying treatment at 150°C / 1h, and then use a pneumatic powder feeder to send the alloy powder into the laser cladding head;

[0058] Step 4: Form 5 layers of 80% TC4 + 20% TiAl gr...

Embodiment 3

[0061] The steps of this method are:

[0062] Step 1: Weigh the TC4 alloy powder and Ti-48Al-2Cr-2Nb alloy powder according to the mass fraction ratio of 4:1, 3:2, 2:3 and 1:4 respectively, and mix them mechanically for 2 hours to obtain the mixed powder. The particle size of the powder is 50-150 μm;

[0063] Step 2: Use an electric grinder to polish the surface of the TC4 titanium alloy substrate to remove the oxide film, wipe the surface of the substrate with alcohol to remove oil, and then put it into the laser 3D printing equipment (LDM8060 laser synchronization produced by Nanjing Zhongke Yuchen Laser Technology Co., Ltd. powder feeding additive manufacturing equipment), the size of TC4 substrate is 100mm×100mm×10mm;

[0064] Step 3: Put the alloy powder in step 1 into a vacuum drying oven for drying treatment at 150°C / 1.5h, and then use a pneumatic powder feeder to send the alloy powder into the laser cladding head;

[0065] Step 4: Form 2 layers of 80% TC4+20% TiAl gr...

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Abstract

The invention provides a method for preparing a TC4 / TiAl gradient material through laser synchronous powder feeding. The method comprises the following steps that firstly, TC4 alloy powder and TiAl alloy powder are mixed in four ratios of mass fractions; secondly, an oxidation film of a TC4 titanium alloy substrate is removed, and the surface of the substrate is deoiled; thirdly, the four kinds ofmixed alloy powder obtained in the first step are put into a vacuum drying oven for drying to obtain dried powder; fourthly, four gradient layers are prepared on the TC4 titanium alloy substrate deoiled in the second step by using the four kinds of mixed alloy powder obtained in the first step from bottom to top in sequence, finally, a total TiAl layer is prepared on the gradient layers, and theTC4 / TiAl gradient material is obtained; and fifthly, whole destressing annealing is conducted. By means of the method, uniform transition of the elements Ti and Al is achieved, residual stress is reduced, the interface structure is improved, cracks are prevented from being produced, connection between the titanium alloy and the TiAl alloy is achieved, the using temperature of a part is increased to 700 DEG C or above from about 400 DEG C, and the high-temperature using performance of a hot-end part is improved.

Description

technical field [0001] The invention proposes a method for preparing TC4 / TiAl gradient material by laser synchronous powder feeding, which belongs to the field of advanced manufacturing technology, and is mainly used to solve the problem of macroscopic cracks in the existing preparation process due to high temperature gradient and large residual stress, which are difficult to produce on the TC4 substrate. on the preparation of TiAl alloys. Background technique [0002] With the advancement of science and technology and the rapid development of the aerospace industry, modern structural materials are developing in the direction of both high "strength / weight ratio" and "high fracture toughness". With the continuous increase of the flight distance of aerospace vehicles, it has become an important goal for the design and manufacture of aerospace engines to continuously improve the thrust-to-weight ratio of engines. [0003] Titanium alloy is a lightweight structural material wid...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F7/02C23C24/10C22C14/00B22F3/24B22F1/00B33Y10/00
CPCB22F7/02C23C24/103C22C14/00B22F3/24B33Y10/00B22F2003/248B22F10/00B22F1/065B22F10/25B22F10/34B22F10/36B22F10/64B22F10/50Y02P10/25
Inventor 徐国建井志成马瑞鑫柳晋刘占起王文博杭争翔郑文涛苏允海曲迎东于宝义
Owner SHENYANG POLYTECHNIC UNIV
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