Results of further X-ray structural investigations of the iron–carbon and iron–nitrogen systems and of related interstitial alloys

Jack, K. H.

doi:10.1107/s0365110x50001075

Cited by 119 publications

(40 citation statements)

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“…8a) resemble the morphology observed for α"-Fe 16 N 2 in ferrite [49]- [51]. The metal atoms in this nitride are arranged in a tetragonally distorted bcc lattice [52]; the nitrogen atoms occupy c-type octahedral interstices in an ordered way. These N atoms lead to only very weak superstructure spots in SADPs (note that the most intense, fundamental spots of α"-Fe 16 N 2 overlap with those of ferrite-matrix spots [53]).…”

Section: Discontinuously Precipitated Nitrides; Later Stagessupporting

confidence: 59%

Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides

Steiner

Meka

Rheingans

et al. 2016

Philosophical Magazine

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. Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides. Philosophical Magazine, 96(15) nitride particles within the ferrite lamellae. The observed structural and compositional changes of the ternary nitrides have been attributed to the thermodynamic and kinetic constraints for the internal precipitation of (misfitting) nitrides in the ferrite matrix.

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Section: Discontinuously Precipitated Nitrides; Later Stagessupporting

confidence: 59%

Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides

Steiner

Meka

Rheingans

et al. 2016

Philosophical Magazine

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“…The complex nature and very small size of the precipitates makes for difficult analysis of images as well as the electron diffraction spot patterns. The purpose of this paper was to investigate key crystallographic aspects of these iron-carbide precipitates and compare results with previous work [3][4][5].…”

Section: Microstructural Featuresmentioning

confidence: 99%

“…Seminal investigations on the early stages of tempering of martensite resulted in the identification of a hexagonal iron-carbide phase, referred to as epsilon-carbide [3,4], and an orthorhombic iron-carbide phase, referred to as etacarbide [5]. In both cases, the chemical compositions are between Fe 2 C and Fe 3 C. These phases are transition phases with very different characteristics than orthorhombic cementite (Fe 3 C or h-carbide), which tends to form at higher tempering temperatures and/or at longer times.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, variations in the carbon contents of the matrix martensite phase and precipitate phase (and possibly other variations) were presumed to have been minimized or eliminated. This paper presents results that initially will be compared with the original 1 and most commonly cited descriptions of the hexagonal epsilon-carbide phase proposed by Jack [3,4] and the orthorhombic eta-carbide phase identified by Hirotsu and Nagakura [5].…”

Section: Introductionmentioning

confidence: 99%

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A Two-Tilt Analysis of Electron Diffraction Patterns from Transition-Iron-Carbide Precipitates Formed During Tempering of 4340 Steel

Thompson

2016

Metallogr. Microstruct. Anal.

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Fine-scale transition-iron-carbide precipitates in a lath martensitic microstructure of 4340 steel tempered at 200°C for 1 h were examined via imaging and electron diffraction techniques with a transmission electron microscope. Region-to-region variations were eliminated by analyzing a small volume of material (about 0.03 lm 3 ) at two tilt conditions. Geometric analyses showed that measured interplanar spacings compared favorably with accepted values from both epsilon-carbide and eta-carbide phases (within 1%), whereas measured interplanar angles were within 1-2% of accepted values. Centered-dark-field imaging identified precisely which reflections were produced from a single group of small precipitates (each about 10 nm in diameter). Consistent indexing schemes are provided for epsilon-and eta-carbide, including the proper angular relationship between the two tilt conditions. An interzonal angle of 17.9 o ± 0.1 o was determined for both candidate phases. The orientation relationship between the observed transition-iron-carbide phase and martensite was determined, and confirmed previous results reported for both carbide phases. Diffracted intensities of several reflections were estimated and compared favorably with those calculated from structure factors derived from idealized crystal structures of both transition-iron-carbide phases. All results are shown to be near-equally consistent with a hexagonal epsilon-carbide phase and an orthorhombic eta-carbide phase.

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“…Essas propriedades são modifi cadas devido à formação de fases cristalinas na superfície das peças, chamadas de nitretos e/ou carbonitretos de ferro (1) , compostas por átomos de carbono, nitrogênio e ferro, onde há a ocorrência da difusão desses elementos na forma atômica ou combinada para o interior do material.…”

Section: Introductionunclassified

Morfologia da camada nitrocarbonetada a plasma do aço DIN 100Cr6

Fontes

Scheid²,

Machado³

et al. 2018

RBAV

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The surface treatments of metallic alloys improve the surface characteristics by the deposition of another material or by surface modification, for instance, with the production of coatings.The nitrocarburizing, considered one of the most important thermochemical treatments, involves the simultaneous diffusion of nitrogen and carbon into the surface. Understanding and controlling the formation of the nitrocarburized layer have considerable industrial interest due to the improvements regarding wear, fatigue, and corrosion resistances of the alloys.In this work, it was performed a surface modification on DIN 100Cr6 steel by plasma nitrocarburizing process. The variables were the treatment temperature (550 °C and 600 °C) and methane concentration in the gas mixture (0%, 1.0%, 1.5%, and 2.0%), por nitrocarbonetação a plasma no aço DIN 100Cr6, variando-se a temperatura de tratamento (550 °C e 600 °C) e a concentração de CH 4 na mistura (0%, 1%, 1,5% e 2%), com tempo de tratamento fixo em 2 horas. As amostras foram caracterizadas por meios das técnicas de DRX, MEV e EDS. Os resultados mostram que a morfologia e a constituição da camada composta são bastante sensíveis à temperatura e à composição química da atmosfera de tratamento. O aumento na quantidade de carbono na mistura gasosa contribui para a formação da fase ε, e o aumento da temperatura promove maiores espessuras da camada composta, da zona de difusão e da camada de micro-porosidade formada.Palavras-chave: Modificação superficial; Aço; Nitrocarbonetação; Metano; Micro-porosidade.

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Results of further X-ray structural investigations of the iron–carbon and iron–nitrogen systems and of related interstitial alloys

Cited by 119 publications

References 1 publication

Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides

Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides

A Two-Tilt Analysis of Electron Diffraction Patterns from Transition-Iron-Carbide Precipitates Formed During Tempering of 4340 Steel

Morfologia da camada nitrocarbonetada a plasma do aço DIN 100Cr6

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