Short-term creep properties and fracture surface of 18 Ni (300) maraging steel plasma nitrided
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Plasma nitriding of a solution annealed and aged 300 grade maraging steel was studied aiming to
increase the creep resistance. The surface microhardness reached 1,140 HV, producing 50 μm layer
composed of ε-Fe3N and γ’-Fe4N nitrides at the uppermost sample layer. The inner core remained
unaltered presenting typical plate-like martensite microstructure of maraging steels with average
microhardness of 604 HV. Surface RMS roughness in the nanometric scale increase from 52 nm to
71 nm. The continuous layer of iron nitrides seems to behave as a barrier for oxidation and for inward
oxygen diffusion improving the creep resistance by reducing the steady-state creep rate (εs) in 52-65%
when compared with the literature results. Dominant creep mechanism is controlled by dislocations
climb. Fracture surfaces of specimens presented ductile failure consisting of equiaxed and bi-modal
dimples in the fibrous zone surrounded by 45º shear lip. Nitrided sample presented a reduced ductility,
associated to the hard surface layer.
Como referenciar
REIS, ADRIANO G. dos; REIS, DANIELI A.P.; ABDALLA, ANTONIO J.; COUTO, ANTONIO A.; OTUBO, JORGE. Short-term creep properties and fracture surface of 18 Ni (300) maraging steel plasma nitrided. Materials Research, p. 1-8, 2017. DOI: 10.1590/1980-5373-mr-2016-0744. Disponível em: http://repositorio.ipen.br/handle/123456789/28525. Acesso em: 30 Dec 2025.
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