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Nikolay G. Razumov,Anatoly A. Popovich,QingSheng Wang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
This paper presents the results of experimental studies on the treatment of Fe–23Cr–11Mn–1N high-nitrogen stainlesssteel powder alloys, synthesized by the mechanical alloying (MA) of elemental powders in the flow of a thermal plasma. Fe–23Cr–11Mn–1N high-nitrogen stainless steel powder alloys were prepared by MA in the attritor under an argon atmosphere. For spheroidization of Fe–23Cr–11Mn–1N high-nitrogen stainless steel powder alloys, the TekSphero 15 plantmanufactured by Tekna Plasma Systems Inc was used. The studies have shown the possibility of obtaining Fe–23Cr–11Mn–1N high-nitrogen spherical powders steel alloys from the powder obtained by MA. According to the results of a series ofexperiments, it was found that the results of plasma spheroidization of powders essentially depend on the size of the fractiondue to some difference in the particle shape and flowability, and on the gas regime of the plasma torch. It is established thatduring the plasma spheroidization process, some of the nitrogen leaves the alloy. The loss rate of nitrogen depends on thesize of the initial particles.
Tagir Makhmutov,Nikolay Razumov,Artem Kim,Nikolay Ozerskoy,Alina Mazeeva,Anatoliy Popovich 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Spherical powders of CoCrFeNiMnW0.25high-entropy alloy were obtained from elemental powders by mechanical alloying(MA) at various energy modes followed by plasma spheroidization. Samples obtained from low-energy MA-powdershave an inhomogeneous microstructure and phase composition. Samples obtained from MA-powders with homogeneousstructures have a high degree of sphericity and chemical homogeneity; the face-centered cubic solid solution represents thephase composition of the powders. The resulting powders can be used in powder-based additive manufacturing technologies.