Structure and physical and mechanical properties of heat-resistant austenitic steel implanted with nitrogen ions
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This paper investigates the structural state and physical and mechanical properties of austenitic steel 55Kh20G9AN4 treated with concentrated fluxes of nitrogen ions. It is shown that ion beam treatment of the steel at temperatures of 620–870 K is accompanied by the formation of nitrogen-modified layers up to 50 μm thick. Ion nitriding at 720–870 K leads to the formation of nanosized particles of CrN and the α-(Fe, Ni) phase in a surface layer of the steel, its higher magnetic properties, and an increase in microhardness up to 1700 HV 0.05. It is found that the maximum wear resistance of the surface steel layers treated with nitrogen ions is achieved after treatment at temperatures of 770–820 K and increases by 6 × 102 times as compared with the initial state. It is shown that the reduction of hardness and wear resistance of the steel after ion beam treatment at 870 K is associated with the increased content of the austenitic γ phase and sizes of particles of CrN and α-(Fe, Ni) in the ion-modified layer.
Keywordsaustenitic steel ion beam nitriding structure phase composition hardness wear resistance magnetic properties
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