Laser additive manufacturing method capable of conveniently obtaining fine equiaxed grains

An equiaxed grain and laser additive technology, which is applied in laser additive manufacturing of metal materials and in the field of laser additive manufacturing, can solve problems such as difficulty in completely ensuring product quality consistency, changes in material characteristics, and unfavorable comprehensive performance, and achieve suitable Effects on mass industrial production and high-performance manufacturing

An equiaxed grain and laser additive technology, which is applied in laser additive manufacturing of metal materials and in the field of laser additive manufacturing, can solve problems such as difficulty in completely ensuring product quality consistency, changes in material characteristics, and unfavorable comprehensive performance, and achieve suitable Effects on mass industrial production and high-performance manufacturing

CN112593106AActive Publication Date: 2021-04-02CAPITAL AEROSPACE MACHINERY
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  • Laser additive manufacturing method capable of conveniently obtaining fine equiaxed grains
  • Laser additive manufacturing method capable of conveniently obtaining fine equiaxed grains

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, taking laser additive manufacturing of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy as an example, a laser additive manufacturing method that can conveniently obtain fine equiaxed grains is characterized in that it includes the following steps:

[0028] In the first step, the titanium alloy powder with a particle size distribution of 160-240 μm and an oxygen content greater than 0.08% is loaded into the powder feeder;

[0029] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas, and the purity of argon gas is not less than 99.999%;

[0030] In the third step, when the argon oxygen content in the working room is less than 30ppm, the additive manufacturing of titanium alloy is started;

[0031] In the fourth step, under the action of laser, the titanium alloy powder is melted and deposited on the substrate;

[0032] In the fifth step, after the deposition is completed, the argon protect...

Embodiment 2

[0037] A laser additive manufacturing method that can conveniently obtain fine equiaxed grains is characterized in that it comprises the following steps:

[0038] In the first step, the titanium alloy powder with a particle size distribution of 160-240 μm and an oxygen content greater than 0.08% is loaded into the powder feeder;

[0039] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas, and the purity of argon gas is not less than 99.999%;

[0040] In the third step, when the argon oxygen content in the working room is less than 30ppm, the additive manufacturing of titanium alloy is started;

[0041] In the fourth step, under the action of laser, the titanium alloy powder is melted and deposited on the substrate;

[0042] In the fifth step, after the deposition is completed, the argon protection chamber is opened, and the deposited titanium alloy is taken out;

[0043] The sixth step is to put the deposited tita...

Embodiment 3

[0047] A laser additive manufacturing method that can conveniently obtain fine equiaxed grains is characterized in that it comprises the following steps:

[0048] In the first step, the titanium alloy powder with a particle size distribution of 160-240 μm and an oxygen content greater than 0.08% is loaded into the powder feeder;

[0049] In the second step, the substrate is fixed on the workbench of an inert processing chamber filled with argon gas, and the purity of argon gas is not less than 99.999%;

[0050] In the third step, when the argon oxygen content in the working room is less than 30ppm, the additive manufacturing of titanium alloy is started;

[0051] In the fourth step, under the action of laser, the titanium alloy powder is melted and deposited on the substrate;

[0052] In the fifth step, after the deposition is completed, the argon protection chamber is opened, and the deposited titanium alloy is taken out;

[0053] The sixth step is to put the deposited tita...

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Abstract

The invention discloses a laser additive manufacturing method capable of conveniently obtaining the fine equiaxed grains. The preset internal stress and distortion energy in a solidification process are regulated and controlled, a mixed structure of columnar crystals with the dislocation density larger than 10<18> m<-2>, the volume fraction ranging from 71% to 85% and the width ranging from 0.28 mm to 0.45 mm and equiaxed crystals with the volume fraction ranging from 15% to 29% and the diameter ranging from 110 [mu]m to 200 [mu]m is obtained, the columnar crystals and the equiaxed crystals are evenly distributed in a staggered mode, and the distance between the adjacent columnar crystals is 2.5 to 4.5 mm. On the basis of the sedimentary structure, triple heat treatment is accurately matched, a fine equiaxed grain structure with the volume fraction not lower than 95% and the diameter not larger than 40 [mu]m is obtained, and high-performance manufacturing of large titanium alloy components can be achieved. While fine and uniform full equiaxed crystal preparation is realized, material components are not changed, the adaptability to special-shaped complex structures is high, the additive manufacturing efficiency is not reduced obviously, and the the laser additive manufacturing method is suitable for batch industrial production.

Description

technical field [0001] The invention relates to the field of laser additive manufacturing of metal materials, in particular to a laser additive manufacturing method that can conveniently obtain fine equiaxed grains. Background technique [0002] Due to the advantages of low density, high specific strength and good corrosion resistance, titanium alloys have been widely used in the aerospace field. Laser additive manufacturing technology is an advanced manufacturing technology that uses lasers to melt and accumulate parts layer by layer based on a three-dimensional CAD model. This technology has the characteristics of high manufacturing flexibility, large size of formable components, high forming efficiency and material utilization rate, short manufacturing cycle, and no need for molds. It has great advantages in the manufacture of complex structural parts of difficult-to-machine materials such as large titanium alloys. [0003] The unique local ultrafast heating, ultrafast c...

Claims

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Application Information

Patent Timeline
02 Apr 2021
Publication
CN112593106A
IPC
C22C1/04; B22F3/105; C22C14/00; B33Y10/00; B33Y80/00; B33Y40/20; C22F1/18; C21D1/78
CPC
C22C1/0458; B22F3/105; C22C14/00; B33Y10/00; B33Y80/00; B33Y40/20; C22F1/183; C21D1/78
Inventors
谢勇; 周庆军