Untersuchungen zur Abschreckalterung stickstoffhaltiger Stähle durch Messung der Dämpfung, Koerzitivfeldstärke und Rückbildung

Nacken, Matthias; Rahmann, Joachim

doi:10.1002/srin.196203312

Cited by 15 publications

(3 citation statements)

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“…For the binary system Fe-N, the data as assembled in Reference 12 [25,35,36,[66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85] was chosen according to the recommendations given there. The binary thermodynamic descriptions of the a and c phase were taken from Reference 22; for the choice of parameters to be optimized, see Section IV.…”

Section: A Binary Fe-n Datamentioning

confidence: 99%

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Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

Göhring

Fabrichnaya

Leineweber

et al. 2016

Metall Mater Trans A

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Several thermodynamic descriptions of the Fe-N and Fe-N-C systems were proposed before now. The results of these descriptions significantly deviate from more recently obtained experimental data. The present work provides a revised thermodynamic description of these systems. The new description for the Fe-N system agrees distinctly better with the experimental data especially for the equilibrium of c 0 -Fe 4 N 1Àx and e-Fe 3 N 1+z . The new thermodynamic description for the Fe-N-C system considering the Fe-rich part of the system with less than 33 at. pct N and less than 25 at. pct C excellently agrees with the new experimental data for both the temperatures of the invariant reactions and the phase boundaries. This in particular concerns the temperature range of typical technical nitriding and nitrocarburizing treatments [723 K to 923 K, (450°C to 650°C)], within which three invariant reactions occur in the ternary system.

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Section: A Binary Fe-n Datamentioning

confidence: 99%

“…Various enlarged sections of the phase diagram are shown in Figure 2 to allow a more detailed comparison with both the experimental data [13,15,25,35,36,66,67,[70][71][72][73][74][75][76][78][79][80][81][82]84,87,88] and the previous predictions from References 22 and 24.…”

Section: A the Binary Fe-n Phase Diagrammentioning

confidence: 99%

Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

Göhring

Fabrichnaya

Leineweber

et al. 2016

Metall Mater Trans A

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“…The chemical potential of dissolved nitrogen (or via Eq. [34] x Astrrm [35] [] Burdese [36] 9 Fast, Verrijp [37] o Corney, Turkdogan [28] tx Rawlings, Tambini [38] 9 Nacken, Rahmann [39] o Wdedt, cited in [21] 9 Imai et al [40] 9 Abiko, Imai [41] .......... Kunze [17] ..... Frisk [18] present work Then, depending on the number of composition-temperature data used, a comparison of the calculated and the experimentally assessed phase diagrams may lose its potentially vindicating significance and a (seemingly) correct Fe-N phase diagram can be calculated, although its underlying thermodynamic description is wrong. In the present work, another route is followed in which use of experimental composition-temperature data of the Fe-N phase diagram is circumvented.…”

Section: Calculation Of Phase Boundaries In the Fe-n Systemmentioning

confidence: 99%

An evaluation of the Fe-N phase diagram considering long-range order of N atoms in γ′-Fe4N1-x and ε-Fe2N1-z

Kooi

Somers

Mittemeijer

1996

Metall Mater Trans A

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The chemical potential of nitrogen was described as a function of nitrogen content for the Fe-N phases c~-Fe[N], 7'-Fe4N 1 x, and e-Fe2N ~_z. For c~-Fe[N], an ideal, random distribution of the nitrogen atoms over the octahedral interstices of the bcc iron lattice was assumed; for y'-Fe4Nl_x and e-Fe2N~_~, the occurrence of a long-range ordered distribution of the nitrogen atoms over the octahedral interstices of the close packed iron sublattices (fcc and hcp, respectively) was taken into account. The theoretical expressions were fitted to nitrogen-absorption isotherm data for the three Fe-N phases. The a/ot + y', o~ + y'/y', y'/y' + e, and y' + e/e phase boundaries in the Fe-N phase diagram were calculated from combining the quantitative descriptions for the absorption isotherms with the known composition of NH3/H 2 gas mixtures in equilibrium with coexisting c~ and y' phases and in equilibrium with coexisting y' and e phases. Comparison of the present phase boundaries with experimental data and previously calculated phase boundaries showed a major improvement as compared to the previously calculated Fe-N phase diagrams, where long-range order for the nitrogen atoms in the y' and e phases was not accounted for.

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Anisotropy of the coercive force of iron with magnetic field-oriented Fe8N precipitates

Neuhäuser

Pitsch

1973

Phys. Stat. Sol. (a)

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The increase of the coercive force of iron by Fe N precipitates has already been dealt with in the literature (1 to 4). The contribution of the precipitates on the coercive force has been interpreted with the idealized assumptions that the particles a r e of spherical shape and nonmagnetic ( 5 , 6). Both assumptions a r e not correct because the formation of the plate-shaped Fe N precipitates in supersaturated b.c.c. Fe-N solid solutions takes place on {lo01 cube planes of the ferrite lattice (7,8) and furthermore these precipitates a r e ferromagnetic with the direction of easy magnetization perpendicular to the {lo01 habit plane of the platelets (9). The following note has the aim to demonstrate that there exists an anisotropic influence of the shape and the ferromagnetism of the Fe8N platelets on the coercive force. 8 8In order to measure this anisotropy unambiguously it is necessary to reduce the precipitation of Fe N platelets to one single cube plane. This is obtained by the superposition of an external magnetic field t o the precipitation treatment (10).If such a magnetic field i s applied in an Fe-N single crystal parallel to aaOO>ferrite direction a magnetic field-orienting is performed in the way that there is preferential precipitation of Fe N platelets on that (100) habit plane which is perpendicular to the direction of the external field (10). 8 8 Using this technique Fe N platelets were precipitated in a single crystal of an 8 Fe-O.O7wt%N alloy a s shown in Fig. 1. A disc-shaped specimen with a diameter of. about 6 mm and a thickness of about 0 . 3 mm was cut from this single crystal in such a way that the habit plane normal 5 of the Fe8N platelets was located in the plane of the disc. The coercive force H was measured with a Dr. Forster-typecoercimeter. (3, ll), where the specimen was mounted such that the direction of the saturation field M i.e. the antiparallel direction H was parallel to the disc plane with an angle 9. between d and H . Within the coercimeter the discshaped

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Untersuchungen zur Abschreckalterung stickstoffhaltiger Stähle durch Messung der Dämpfung, Koerzitivfeldstärke und Rückbildung

Cited by 15 publications

References 0 publications

Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

Thermodynamics of the Fe-N and Fe-N-C Systems: The Fe-N and Fe-N-C Phase Diagrams Revisited

An evaluation of the Fe-N phase diagram considering long-range order of N atoms in γ′-Fe4N1-x and ε-Fe2N1-z

Anisotropy of the coercive force of iron with magnetic field-oriented Fe8N precipitates

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