Nitrogen uptake by an Fe–V alloy: Quantitative analysis of excess nitrogen

Hosmani, Santosh S.; Schacherl, R. E.; Mittemeijer, E. J.

doi:10.1016/j.actamat.2006.02.017

Cited by 67 publications

(74 citation statements)

References 24 publications

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“…Using the nitrogen diffusion coefficient data from [22] and data for c S N a from [19], it follows from Eq. 1 that 55 h of nitriding at 580°C is more than enough to realize homogeneous, through nitriding of the foil specimen.…”

Section: Pre-nitridingmentioning

confidence: 99%

“…In order to resolve this dilemma, this study has been devoted to a quantitative, experimental analysis of the various types of absorbed nitrogen. To this end, nitrogen-absorption isotherms have been determined: a nitrogen-absorption isotherm shows the dependence of the amount of nitrogen taken up by a (homogeneously) nitrided specimen as a function of the nitriding potential (directly related to the chemical potential of nitrogen [3,4]) at a specific temperature for fixed nitride-precipitation morphology [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nitrogen absorption by Fe-1.04at.%Cr alloy: uptake of excess nitrogen

Hosmani¹,

Schacherl

Mittemeijer

2008

J Mater Sci

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By dedicated pre-nitriding (at 580°C in an ammonia/hydrogen gas atmosphere) and de-nitriding (at 470°C in a hydrogen gas atmosphere) experiments, performed on Fe-1.04at.%Cr alloy, it could be demonstrated that the uptake of ''excess'' nitrogen by the nitrided ferritic matrix is not due to the presence of iron in chromiumnitride precipitates, as it was suggested previously. The determination of nitrogen-absorption isotherms for these pre-nitrided and de-nitrided Fe-1.04at.%Cr alloy specimens revealed that the total amount of excess nitrogen in the alloy is composed of two parts: (a) nitrogen adsorbed at the precipitate/matrix interface, and (b) nitrogen dissolved interstitially in the ferrite matrix strained by the misfit between (coherent) the CrN precipitates and the matrix.

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Section: Pre-nitridingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen absorption by Fe-1.04at.%Cr alloy: uptake of excess nitrogen

Hosmani¹,

Schacherl

Mittemeijer

2008

J Mater Sci

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“…5; the absorption-isotherms for pure α-Fe have been drawn as straight lines passing through the points C on the ordinates, using data from Ref. 33).…”

Section: Table 1) Values For the Nitrogen Levels A B And C For The mentioning

confidence: 99%

“…Upon nitriding of iron-based binary alloys containing alloying elements with a strong affinity for nitrogen, such as Cr [10][11][12][13][14][15][16][17][18][19][20][21], Al [22][23][24][25][26][27], V [28][29][30][31][32][33] and…”

Section: Introductionmentioning

confidence: 99%

Normal and excess nitrogen uptake by iron-based Fe–Cr–Al alloys: the role of the Cr/Al atomic ratio

Jung

Schacherl

Bischoff

et al. 2011

Philosophical Magazine

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“…The nitrogen which is responsible for the porosity development is the less strongly bonded dissolved nitrogen. [18] Until now the attention was largely devoted to pore development in the iron-nitride compound layer, whereas little attention was paid on pore development in nitrogen ferrite and nitrogen austenite. Yet, as shown in this work, such pore formation in the nitrogen diffusion zone is a generally occurring phenomenon, leading to pore fractions of possibly 10 vol.…”

Section: Introductionmentioning

confidence: 99%

Pore Formation Upon Nitriding Iron and Iron-Based Alloys: The Role of Alloying Elements and Grain Boundaries

Schwarz

Göhring

Meka

et al. 2014

Metall Mater Trans A

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Pure iron and a series of iron-based Fe-Me alloys (with Me = Al, Si, Cr, Co, Ni, and Ge) were nitrided in a NH 3 /H 2 gas mixture at 923 K (650°C). Different nitriding potentials were applied to investigate the development of pores under ferrite and austenite stabilizing conditions. In all cases, pores developed in the nitrided microstructure, i.e., also and strikingly pure ferritic iron exhibited pore development. The pore development is shown to be caused by the decomposition of (homogeneous) nitrogen-rich Fe(-Me)-N phase into nitrogen-depleted Fe(-Me)-N phase and molecular N 2 gas. The latter, gas phase can be associated with such high pressure that the surrounding iron-based matrix can yield. Thermodynamic assessments indicate that continued decomposition, i.e., beyond the state where yielding is initiated, is possible. Precipitating alloying-element nitrides, i.e., AlN, CrN, or Si 3 N 4 , in the diffusion zone below the surface, hinder the formation of pores due to the competition of alloying-element nitride (Me x N y ) precipitation and pore (N 2 ) development; alloying elements reducing the solubility of nitrogen enhance pore formation. No pore formation was observed upon nitriding a single crystalline pure iron specimen, nitrided under ferrite stabilizing conditions, thereby exhibiting the essential function of grain boundaries for nucleation of pores.

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Nitrogen uptake by an Fe–V alloy: Quantitative analysis of excess nitrogen

Cited by 67 publications

References 24 publications

Nitrogen absorption by Fe-1.04at.%Cr alloy: uptake of excess nitrogen

Nitrogen absorption by Fe-1.04at.%Cr alloy: uptake of excess nitrogen

Normal and excess nitrogen uptake by iron-based Fe–Cr–Al alloys: the role of the Cr/Al atomic ratio

Pore Formation Upon Nitriding Iron and Iron-Based Alloys: The Role of Alloying Elements and Grain Boundaries

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