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.