Preparation method of oxide dispersion strengthening steel spherical powder for 3D printing

A dispersion-strengthened, spherical powder technology, applied in the field of 3D printing, can solve the problems of nano-oxide particle growth, difficulty in large-scale production, and limited application, and achieve simple preparation process, low production cost, and less introduction of impurities Effect

Active Publication Date: 2021-03-09
中科南京绿色制造产业创新研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The principle is to melt the powder through plasma, and improve the sphericity and fluidity by relying on its own spheroidization effect or modification of the powder morphology. However, there are two problems in this method: (1) the nanoclusters in the powder are in the Oxide particles are formed after melting, and the powder undergoes secondary melting and solidification during the 3D printing process after spheroidization, causing the formed nano-oxide particles to grow rapidly in the melt or burnt into slag; (2) the technology There are problems such as high cost and difficulty in large-scale production, which limit its application in the production of oxide dispersion strengthened steel powder raw materials for 3D printing
[0007] That is, there is still a lack of a spheroidizing treatment method for mechanically alloyed oxide dispersion-strengthened steel powders to achieve low-cost preparation of high-quality 3D printing oxide dispersion-strengthened steel spherical powders

Method used

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  • Preparation method of oxide dispersion strengthening steel spherical powder for 3D printing
  • Preparation method of oxide dispersion strengthening steel spherical powder for 3D printing
  • Preparation method of oxide dispersion strengthening steel spherical powder for 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The oxide dispersion strengthened steel powder whose composition is Fe-16Cr-0.5Ti-0.5Y is selected as the raw material, which is obtained by high-energy ball milling according to the formula, and its SEM image is as follows figure 1 As shown, it can be found that the powder is irregular and flat, with extremely poor sphericity and fluidity, and cannot be directly 3D printed.

[0068] Weigh 100g of powder raw material and add it to the fluidized bed. Zirconia ceramic particles with a particle size range of 125-250μm are used as the auxiliary medium of the jet mill. Weigh 10g of the zirconia powder and add it to the fluidized bed, and pass through the argon gas to discharge the fluidized bed. Inner air, the gas velocity is 0.6m / min, and the time is 60min. Put the fluidized bed into the resistance furnace to ensure that the powder raw material flow area is located in the heating constant temperature area and the gas inlet / outlet is far away from the heating area. After 5 m...

Embodiment 2

[0072] The difference between Example 2 and Example 1 is that the composition of the oxide dispersion strengthened steel powder in Example 1 is changed from Fe-16Cr-0.5Ti-0.5Y ferrite to Fe-18Cr-8Ni- For 0.5Ti-0.5Y austenite, the jet milling time was reduced from 60min to 15min, the experimental temperature was increased from 600°C to 850°C, and other experimental conditions remained unchanged.

[0073] The powder sphericity measured by SEM is 76 (d1 / da), the fluidity measured by Hall flow meter is 19.8s / 50g, and the oxygen increment is 1800ppm. It shows that the change of the oxide dispersion strengthened steel powder matrix and composition will not significantly affect the feasibility of the method. Although reducing the jet milling time will shorten the spheroidization time of the powder, the increase in temperature can promote the metal powder. Softening effect, reducing hardness, thereby strengthening the effect of powder spheroidization treatment.

Embodiment 3

[0075] The difference between this Example 2 and Example 1 is that the jet mill auxiliary medium in Example 1 is changed from zirconia ceramic particles to tungsten carbide ceramic particles, and 100 g of oxide dispersion strengthened steel powder raw materials are weighed, and tungsten carbide ceramic particles are weighed. Since the particle is larger than the zirconia powder, 20g is weighed, and the oxide dispersion strengthened steel powder raw material and tungsten carbide ceramic particles are added to the fluidized bed at the same time.

[0076] The powder sphericity measured by SEM is 81 (d1 / da), the fluidity measured by Hall flow meter is 18.8s / 50g, and the oxygen increment is 400ppm. Since tungsten carbide has a higher hardness than zirconia, it has a better effect when assisting jet milling.

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Abstract

The invention relates to a preparation method of oxide dispersion strengthening steel spherical powder for 3D printing. The preparation method comprises the following steps of (1) after mixing gas atomization pre-alloyed powder and rare earth oxide powder, and carrying out high-energy ball milling to obtain the oxide dispersion strengthening steel powder; (2) after mixing the obtained oxide dispersion strengthening steel powder with a jet milling medium, adding the mixture into a fluidized bed, and discharging air in the fluidized bed to obtain the material carrying fluidized bed; and (3) heating the obtained material carrying fluidized bed, introducing mixed gas, controlling the flow of the mixed gas after the fluidized state of the powder in the material carrying fluidized bed is stable,and cooling after preset reaction time is reached, thereby obtaining the steel spherical powder from the material carrying fluidized bed. The method has the advantages of simple preparation process,low production cost, high efficiency, small impurity introduction amount, easy realization of engineering amplification and the like, the sphericity degree is greater than 75d1/da, the granularity is10 microns-100 microns, the fluidity numerical value is less than 20s/50g, and the oxygen content is less than 3500 ppm.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a preparation method of oxide dispersion strengthened steel spherical powder for 3D printing. Background technique [0002] Oxide dispersion strengthened steel has the advantages of good high temperature creep performance, excellent radiation damage resistance and high structural stability in extreme environments, and is considered to be an ideal candidate material for key components of fourth-generation nuclear reactors. Its excellent mechanical properties and structural stability are mainly derived from the dispersed distribution of nano-oxide particles inside the matrix, which strengthen the metal matrix by pinning dislocations and grain boundaries, and strengthen the metal matrix by irradiating voids and helium bubbles. Efficient trapping of defects suppresses radiation damage. The traditional preparation route of oxide dispersion strengthened steel is to use high-energy mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00C22C32/00
CPCB22F9/04C22C32/0026B22F2009/043B22F1/145Y02P10/25
Inventor 李少夫杨亚锋崔景毅胡超权王宇枭
Owner 中科南京绿色制造产业创新研究院
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