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Electronic beam added material manufacturing method of molybdenum base alloy powder

A molybdenum-based alloy and manufacturing method technology, applied in the field of metal additive manufacturing, can solve problems such as powder splashing, spheroidization, and electron beam additive manufacturing process parameters that have not developed molybdenum-based alloys, and achieve uniform structure of components

Active Publication Date: 2019-08-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electron beam additive manufacturing process parameters of molybdenum-based alloys have not been developed at present, and there are technical problems such as spheroidization and powder splashing during the preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step (1), prepare raw material spherical Mo-Ti-Zr alloy powder (TZM powder), control fluidity=20s / 50g, particle size range 55~85μm, wherein d 10 Controlled at 58μm, d 50 Controlled at 72μm, d 90 Controlled at 82μm;

[0024] Step (2), carrying out three-dimensional modeling and structural optimization of the TZM component to be formed;

[0025] In step (3), the molding chamber and the substrate are cleaned, the substrate is leveled, the molding chamber is evacuated to an air pressure of 0.08Pa, and then filled with argon to an air pressure of 0.16Pa.

[0026] Step (4), preheat the substrate and the powder bed, the substrate preheating temperature is 1040°C, set the contour melting parameters: the number of electron beam splits is 40, the scanning jump speed is 1500m / s, the scanning beam current is 2mA, and the scanning speed is 0.4m / s; filling line melting parameters: filling line spacing 0.2mm, filling line point spacing 0.1mm, rotation angle 90°, scanning speed 0.3...

Embodiment 2

[0030] Step (1), prepare raw material spherical Mo-Re powder, control fluidity=27s / 50g, particle size range 55~85μm, wherein d 10 Controlled at 60μm, d 50 Controlled at 69μm, d 90 Controlled at 80μm;

[0031] Step (2), three-dimensional modeling and structural optimization of the Mo-Re component to be formed;

[0032] In step (3), the molding chamber and the substrate are cleaned, the substrate is leveled, the molding chamber is evacuated to an air pressure of 0.07Pa, and then filled with argon to an air pressure of 0.19Pa.

[0033] Step (4), preheat the substrate and the powder bed, the substrate preheating temperature is 1010°C, set the contour melting parameters: the number of electron beam splits is 40, the scanning jump speed is 1500m / s, the scanning beam current is 2mA, and the scanning speed is 0.4m / s; filling line melting parameters: filling line spacing 0.2mm, filling line point spacing 0.1mm, rotation angle 90°, scanning speed 0.3m / s, small beam current 2mA scan ...

Embodiment 3

[0037] Step (1), prepare raw material spherical Mo-La 2 o 3 Powder, fluidity control = 16s / 50g, particle size range 55-85μm, where d 10 Controlled at 59μm, d 50 Controlled at 71μm, d 90 Controlled at 81μm;

[0038] Step (2), the Mo-La to be molded 2 o 3 3D modeling and structural optimization of components;

[0039] In step (3), the molding chamber and the substrate are cleaned, the substrate is leveled, the molding chamber is evacuated to an air pressure of 0.06Pa, and then filled with argon to an air pressure of 0.20Pa.

[0040] Step (4), preheat the substrate and the powder bed, the substrate preheating temperature is 1060°C, set the contour melting parameters: the number of electron beam splits is 40, the scanning jump speed is 1500m / s, the scanning beam current is 2mA, and the scanning speed is 0.4m / s; filling line melting parameters: filling line spacing 0.2mm, filling line point spacing 0.1mm, rotation angle 90°, scanning speed 0.3m / s, small beam current 3mA sca...

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PUM

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Abstract

The invention discloses an electronic beam added material manufacturing method of molybdenum base alloy powder. The particle size of the used molybdenum base alloy powder is 55-85 microns; and when powder layers are scanned by electronic beams, a twice scanning mode is adopted. The molybdenum base alloy electronic beam added material manufacturing process finds out manufacturing process parametersof added materials with the highest compactness, and adopts the twice scanning mode to solve the nodulizing and powder splashing problems in the manufacturing of the electronic beam added materials to improve the compactness of components to the casting level.

Description

technical field [0001] The invention belongs to the technical field of metal additive manufacturing, and in particular relates to an electron beam additive manufacturing method of molybdenum-based alloy powder. Background technique [0002] The refractory metal molybdenum-based alloy has the advantages of good electrical and thermal conductivity, small thermal expansion coefficient, excellent high-temperature strength, etc., and has a high melting point and strong corrosion resistance. It is often used as high-temperature components, such as engine nozzles and rocket noses. Cones, aircraft leading edge, etc. Some precision high-temperature components are difficult to manufacture by powder metallurgy and machining methods due to their complex structures and high dimensional accuracy requirements, or the material utilization rate is low, so they are prepared by near-net shape additive manufacturing processes. However, the development of additive manufacturing process for moly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F10/00B22F10/362B22F10/32B22F10/36B22F10/28B22F10/34B22F10/366Y02P10/25
Inventor 巩前明干建宁杜锴黄逸伦李愉珧林峰赵海燕
Owner TSINGHUA UNIV
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