Differences in the microstructure of iron mechanically processed powder alloyed with interstitial and substitutional elements

Rawers, J. C.; Krabbe, Rick; Cook, Dianne; Kim, T.H.

doi:10.1016/s0965-9773(97)00039-1

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…37-4% of the total infused nitrogen is entrapped into the crystal interstitial sites for the milling durations of 24-144 h. Hence, it is straightforwardly inferred that the considerable amount of nitrogen is distributed among the other sites of the structure consisting of the defects and amorphous phase. Compared to other researches [24,25], the minor contribution of the crystal interstitial sites to the supersaturation in this work is attributed to the development of the considerable contents of the amorphous phase providing more preferential sites for nitrogen atoms. Note that the amorphization reaction in the Fe-Cr-Mn-N system is more active than the Fe-N system studied in Refs.…”

Section: Estimation Of Interstitial Nitrogen Content In the Nanocrystalscontrasting

confidence: 57%

“…Since the mismatch strain of solute nitrogen is reduced in the defects, a high proportion of nitrogen atoms are diffused down to the defects. Mossbauer studies of high-nitrogen iron powders prepared by MA have signified that a considerable amount of infused nitrogen accumulates at grain boundaries [24,25].…”

Section: Structural Evolution During Mamentioning

confidence: 99%

“…Note that the amorphization reaction in the Fe-Cr-Mn-N system is more active than the Fe-N system studied in Refs. [24,25]. Eventually, it is noted that aspects of sintering and mechanical behaviors of these mechanically alloyed Cr-Mn-N stainless steels have been recently focused [34][35][36][37].…”

Section: Estimation Of Interstitial Nitrogen Content In the Nanocrystalsmentioning

confidence: 99%

“…Most of them have attributed the nitrogen supersaturation to preferential sites at dislocation elastic stress fields and nanograin boundaries developed during MA. Typically, Rawers et al [24,25] have shown that in Fe-4.1N and Fe-1.36N alloys prepared by MA, 50% and 25% of nitrogen are entrapped into the crystal interstitial sites, respectively. To our knowledge, no systematic work has been reported on the contribution of the crystal interstitial sites to the nitrogen supersaturation of stainless steels.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Salahinejad

Amini

Ghaffari

et al. 2010

Journal of Alloys and Compounds

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Section: Estimation Of Interstitial Nitrogen Content In the Nanocrystalscontrasting

confidence: 57%

Section: Structural Evolution During Mamentioning

confidence: 99%

Section: Estimation Of Interstitial Nitrogen Content In the Nanocrystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Salahinejad

Amini

Ghaffari

et al. 2010

Journal of Alloys and Compounds

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“…En [18] , J.C. Rawers et al concluyen tras varios análisis mediante difracción de rayos-X y espectroscopía Mössbauer que tras el proceso de aleación mecánica la concentración de elementos substitucionales (y también intersticiales) en el interior de los granos es muy pequeña, y que la mayoría de ellos se encuentran en borde de grano. De esta manera, la mayor parte de los átomos de niobio tras la molienda se deberían encontrar en los bordes de grano, por lo que han de ser "arrastrados" por estos en su movimiento, ralentizando en gran medida su velocidad.…”

Section: Figure 5 Evolution Of Crystallite Size (Nm) As a Function Ounclassified

Estudio de la estabilidad térmica de polvo de hierro nanoestructurado en función del tipo de refuerzo (Nb, NbC) y de su contenido

Fuentes-Pacheco¹,

Campos²,

Torralba³

2011

REVMETAL

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En aceros estructurales, la reducción del tamaño de grano es el único mecanismo que permite un aumento significativo tanto de la resistencia como de la tenacidad del material [1] . Este concepto ha sido utilizado con éxito en los aceros microaleados [2] , en los que la combinación de tratamientos termomecánicos (ciclos sucesivos de deformación y recristalización de la austenita) con la presencia de elementos de microaleación (EMAs), proporciona un tamaño medio de grano ferrítico típicamente de 10 µm, y un tamaño mínimo alcanzable comercialmente de alrededor de 1 µm [3] . Los elementos de microaleación (Nb, Ti, V) son elementos formadores de carburos/nitruros que precipitan uniformemente en la microestructura dificultando el crecimiento de grano y modificando las condiciones de recristalización de la austenita.Los aceros microaleados no se han desarrollado mediante técnicas pulvimetalúrgicas debido a ciertas dificultades técnicas, como son la imposibilidad de realizar tratamientos termomecánicos durante un ResumenEn los aceros estructurales, una estrategia efectiva para incrementar tanto la resistencia como la tenacidad es disminuir el tamaño de grano, tal y como ponen de manifiesto los aceros microaleados. Para retrasar e incluso inhibir el crecimiento de grano existen dos mecanismos básicos: la presencia de partículas de una segunda fase ("particle pinning") y la presencia de elementos en solución sólida substitucional ("solute drag"). El efecto de la presencia de NbC para inhibir el crecimiento del grano asutenítico está más que demostrado. Sin embargo, no está claro cuál de los dos mecanismos (particle pinning o solute drag) es el más efectivo para retener el grano ferrítico. Para comprobarlo se han preparado polvos de hierro nanoestructurado mediante aleación mecánica, reforzados bien con niobio, bien con NbC. El presente trabajo tiene como objetivo estudiar la estabilidad térmica de la ferrita de dichos polvos en función del tipo de refuerzo (Nb en forma elemental o NbC) y de su contenido. Palabras claveNiobio; Aleación mecánica; Aceros microaleados sinterizados; Estabilidad térmica; Polvo nanoestructurado; Crecimiento de grano ferrítico. Thermal stability of nanostructured iron powder as a function of amount and nature of reinforcement (Nb or NbC) AbstractIn structural steels, an effective strategy to succeed in increasing both strength and toughness is the grain refining, like in microalloyed steels. To delay or even inhibit the grain growth there are two basic mechanisms: particle pinning and solute drag. The effect of the presence of small particles of NbC to inhibit the austenitic grain growth is well known. However, it is not so clear which mechanism will be more effective to delay ferritic grain growth. In order to confirm it, nanostructured iron powders reinforced with Nb and NbC have been prepared by mechanical alloying. The main objective of this work is, therefore, to study the thermal stability of the nanostructured powder as a function of the reinforce type (elemental Nb or NbC) and its conte...

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Thermal analysis, microstructure and impurity phases evolution in Fe14Cr ferritic steel powders ball-milled in air and under an argon atmosphere

Mihalache

Mercioniu

Aldica

et al. 2018

J Therm Anal Calorim

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Differences in the microstructure of iron mechanically processed powder alloyed with interstitial and substitutional elements

Cited by 14 publications

References 4 publications

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Crystal interstitial sites contribution to nitrogen supersaturation in mechanically alloyed Fe–Cr–Mn–N alloys

Estudio de la estabilidad térmica de polvo de hierro nanoestructurado en función del tipo de refuerzo (Nb, NbC) y de su contenido

Thermal analysis, microstructure and impurity phases evolution in Fe14Cr ferritic steel powders ball-milled in air and under an argon atmosphere

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