Structural and magnetic characterization of martensitic Maraging-350 steel

Nunes, G. C. S.; Sarvezuk, P.W.C.; Biondo, Valdecir; Blanco, Marìa Cecilia; Nunes, M.V.S.; Andrade, Ankilma do Nascimento; Paesano, Andrea

doi:10.1016/j.jallcom.2015.06.008

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…This steel material is a soft ferromagnetic and residual induction and coercive field increase linearly with the maximum applied field of a minor loop until 250 Oe. Both magnetic parameters show an asymptotical tendency beyond this value (250 Oe) [5].…”

Section: Introductionmentioning

confidence: 89%

“…Observed superparamagnetic properties indicate high defection of the crystal structures of the Fe-oxides produced during fretting [4]. Characterization of structural and magnetic properties of martensitic Maraging-350 steel was performed by Nunes et al [5]. This steel material is a soft ferromagnetic and residual induction and coercive field increase linearly with the maximum applied field of a minor loop until 250 Oe.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Magnetic Phases in LC200N Steel by Backscattering Mössbauer Spectrometry

2017

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In this paper we identified iron phases in three different samples of highly corrosion-resistant steel LC200N using the Mössbauer spectrometry which is particularly suited method for this purpose. Special emphasis is put upon magnetically active crystalline phases. The samples had different thermal history: (1) hardened, (2) hardened with consequent rapid quenching in liquid nitrogen, (3) non-hardened and prepared in a disc form with two sides ("as cut" and polished). Both ferritic magnetic phases and non-magnetic austenite phase were found in these samples. Relative content ratios between these phases were determined for each type of the samples and their respective sides. Higher amount of magnetic phases was found in non-hardened sample and on polished sides of all samples in general. The elemental characterization was accomplished by neutron activation analysis.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Identification of Magnetic Phases in LC200N Steel by Backscattering Mössbauer Spectrometry

2017

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“…Due to misfit of the Bragg reflection (2 0 0) on the metallic phases and the knowledge that some maraging steels present tetragonal distortion [14][15][16], a second model (tetragonal version) was created using equivalent tetragonal structures for these phases.…”

Section: Xrd Analysismentioning

confidence: 99%

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

et al. 2021

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Maraging steels are martensitic steels hardened by precipitation of intermetallic compounds in thermal aging, with good machining properties and high strength, fracture toughness and corrosion resistance, being used in aircraft parts and rocket motor-case, tooling applications and nuclear plants. During thermal aging in steam atmosphere a protective and corrosion resistant oxide layer is formed over the bulk. In this work, conventional Bragg-Brentano geometry was used to identify the phases formed in four specimens of maraging steel grade 300 with different surface finishes that were previously solution annealed twice at (950 ± 5) °C for 1 h, air-cooled, and submitted to oxidation process under positive pressure about 1.5 kPa of steam at (480 ± 5) °C for 6 h, followed by forced air-cooling. Diffraction patterns were measured employing CuKα radiation, ranging 20º < 2θ < 85º and the Rietveld method was used to better characterize the structures identified. Through Rietveld refinements it was possible to conclude that the layer formed during heat treatment process is constituted by a transition metallic phase with a quasi-cubic face centered unit cell, and an oxide layer that includes hematite, magnetite and a spinel structure type MFe2O4, where M could be an alloying element, for all analyzed samples.

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“…Maraging steels, basically Fe-Ni-Co-Ti alloys with low carbon content, are often used in the ultracentrifuge envelope,. Thus, their microstructural matrix consists in a relatively soft martensitic structure (BCC-body centered cubic) [1,2] some research compare this structural with low tetragonality [3]. Nonetheless, these materials exhibit excellent mechanical properties at the aged condition due to precipitation hardening of intermetallic phases such as Ni 3 (Ti, Mo) and Fe 2 Mo [2,4].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, these materials exhibit excellent mechanical properties at the aged condition due to precipitation hardening of intermetallic phases such as Ni 3 (Ti, Mo) and Fe 2 Mo [2,4]. Besides, some previous works has shown that the nickel atoms in the Ni 3 Ti unit cell can be replaced by cobalt and iron atoms, while titanium atoms can be replaced by molybdenum atoms [3]. It is important to note that distortions could have been observed while performing high temperature aging, due to the formation of reverse austenite (Fe x Ni).…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Iron Oxide Grown On 18% Ni-Co-Mo-Ti Ferrous Base Alloy Aged Under Superheated Steam Atmosphere

Cardoso

Igreja

Garcia

et al. 2021

Preprint

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18% Ni-Co-Mo-Ti Ferrous base alloys are special materials, widely used in the industry of isotopic enrichment after specific annealing and aging thermal treatment. The desirable high mechanical properties can then be attained by adequate aging heat treatment, answering the structural materials specifications required by defense applications in aerospace and nuclear engineering. For instance, the isotopic enrichment, in rocket engine envelope application, when associated with high temperature and chemical residues like acidic solutions, can induce corrosion and hydrogen embrittlement in martensite structures. To limit these corrosion and hydrogen embrittlement phenomena, an adherent and protective layer of iron oxides can be grown on the material surface by using adequate atmosphere during the aging treatment. Due to its application in strategic areas, the characterization of these oxide layers in maraging steels is of importance as well as the understanding of their growth kinetics. For this purpose, several techniques, such as Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Glow Discharge Optical Emission Spectroscopy (GDOES), Microabrasive wear testing, Hardness, Grazing Incidence X-ray Diffraction (GIXRD) and X-ray Photoelectron Spectroscopy (XPS), have been performed for chemical and structural characterization of the oxide films formed after vapor exposed thermal aging at 510°C . The oxide layer consists mostly in two sub-layers composed by magnetite (Fe3O4) and an external layer of hematite (Fe2O3). A thick interface between the oxide layer and the bulk is enriched in Ti and Mo, whereas the analyses of deep bulk material show an enriched area with Ni and Co.

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Structural and magnetic characterization of martensitic Maraging-350 steel

Cited by 12 publications

References 16 publications

Identification of Magnetic Phases in LC200N Steel by Backscattering Mössbauer Spectrometry

Identification of Magnetic Phases in LC200N Steel by Backscattering Mössbauer Spectrometry

Oxide layer characterization by XRD and Rietveld refinements in maraging steel 300 aged in steam atmosphere

Structural Characterization of Iron Oxide Grown On 18% Ni-Co-Mo-Ti Ferrous Base Alloy Aged Under Superheated Steam Atmosphere

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