METHOD FOR SELECTIVE LASER SINTERING OF MEDIUM-ENTROPY ALLOY OF Fe-Co-Ni-Cr-C SYSTEM Russian patent published in 2023 - IPC B29C64/153 B22F3/105 C22F1/00 

FIELD: powder metallurgy of alloys.

SUBSTANCE: invention relates to the modes of producing products using additive technologies, to the production of parts using selective laser sintering with complex geometry from a medium-entropy alloy of the Fe-Co-Ni-Cr-C system, which can be used in low-temperature conditions. The method of selective laser sintering of a medium-entropy alloy of the Fe-Co-Ni-Cr-C system involves using as a starting material a powder of a medium-entropy alloy Fe₆₅(CoNi)₂₅Cr_9.5C_0.5 with the following ratio of components in atomic percent (at.%): 65 iron, 12.5 cobalt, 12.5 nickel, 9.5 chromium, 0.5 carbon, the formation of a product from which is carried out on a steel substrate, and the direction of laser movement when fusing each subsequent layer changes by 67°. The distance between the tracks and the thickness of the applied layer according to the simulation results are 50 mcm and 30 mcm, respectively. The product is formed using the following process parameters: beam power - 200-250 W, scanning speed 1600-2200 mm/s, while the pore volume fraction of the finished samples ranges from 0.1% to 0.3%.

EFFECT: method is provided for selective laser sintering of a medium-entropy alloy of the Fe-Co-Ni-Cr-C system, which has a structure with a pore volume fraction not exceeding 0.1% to 0.3% and high mechanical properties of the alloy.

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