Phase identification during aging of some nitrided ferrous materials

Hinojosa, G.; Oseguera, J.; Schabes-Retchkiman, P.S.

doi:10.1016/s0040-6090(99)00196-0

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…The dissolved N hardens the matrix by solid solution hardening and the α ", if it is minute in size, can hardens it by precipitation hardening. 12,13) When the contribution of the alloy nitride to hardening is evaluated, we need to reduce the amount of dissolved N and the fine α ". In order to transform dissolved N and fine α " into coarse γ ' -Fe 4 N, which contributes less to hardening, some of the nitrocarburized square-bar specimens were aged in a vacuum furnace at 673 K for 2 hours.…”

Section: Alloy Preparation and Heat Treatmentmentioning

confidence: 99%

Hardening Behavior in Diffusion Zone of Fe–Mn and Fe–Cr Binary Alloys Nitrocarburized after Cold Working

Yuya

Miyamoto

2022

ISIJ Int.

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Section: Alloy Preparation and Heat Treatmentmentioning

confidence: 99%

Hardening Behavior in Diffusion Zone of Fe–Mn and Fe–Cr Binary Alloys Nitrocarburized after Cold Working

Yuya

Miyamoto

2022

ISIJ Int.

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“…An interatomic distance of [100] α" direction is close to that of [100] matrix , the difference within 0.3%. 19,20) This difference is small enough that α" precipitates on the matrix (001) plane coherently or semi-coherently. Therefore, the fine α" precipitates observed in the TEM photos can harden the matrix by precipitation hardening.…”

Section: Effect Of α"-Fe 16 N 2 On Hardnessmentioning

confidence: 99%

Effect of Pre-heat Treatment on Hardening Behavior in Gas Nitrocarburized Carbon Steel

et al. 2016

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To investigate the effect of the pre-heat treatments on hardening behavior in plane carbon steel during gas nitrocarburizing process, Fe-0.4mass%C-0.2mass%Si-0.8mass%Mn steel was nitrocarburized after pre-heat treatments, normalizing and low-temperature annealing. Hardness and nitrogen concentration in nitrocarburized layer of the normalized and annealed steel was lower than that of steel without pre-heat treatment. Nitrocarburized microstructure was observed by transmission electron microscopy. The observation showed that iron nitrides α"-Fe 16 N 2 were precipitated. The α"-Fe 16 N 2 grains formed in the normalized and annealed steel was larger than that in the steel without pre-heat treatment. These results suggest that both the nitrogen concentration and precipitation behavior of α"-Fe 16 N 2 in the nitrocarburizing process contribute to the difference of the amount of hardening between the pre-heat treated steel and steel without pre-heat treatment.

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“…A hardened layer is supported by the high nitrogen martensite and iron nitride. [9][10][11][12][13] To further improve the properties of nitrided surface, some post treatments after the nitriding process were examined [14][15][16][17] , such as the aging process [15][16][17] . A. Alsaran et al 15) found that a large hardening phenomenon occurred by aging after nitriding-quenching treatment and the surface hardness in the low alloy steel reached to 1000 HV caused by the hard α -Fe 16 N 2 phase.…”

Section: Introductionmentioning

confidence: 99%

Wear Resistance of Industrial Pure Iron Treated by Nitriding and Quenching Followed by Aging Process

et al. 2016

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The wear resistance of iron nitrides compound layers and a high nitrogen martensite phase formed in the material surface for industrial pure iron, treated by nitriding and quenching followed by aging process were studied experimentally. Both the compound layer without pores by lowering the nitriding temperature and the high nitrogen martensite phase, showed the same tendency to high wear resistance. On the other hand, the pores in the compound layer made by the longer nitriding time decreased the wear resistance due to the acceleration of crack propagation. Metal ows were observed at the ε-phase in the compound layer very close to the surface after a sliding test. However, no strain hardening was observed. It was also found that the metal ows on a large part of the martensite layer and the hardness increased considerably.These results revealed that the high hardness ε-phase shows high wear resistance due to the plastic deformation, whereas the nitrogen martensite shows high wear resistance by the plastic deformation accompanied with the strain hardening.

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Phase identification during aging of some nitrided ferrous materials

Cited by 9 publications

References 10 publications

Hardening Behavior in Diffusion Zone of Fe–Mn and Fe–Cr Binary Alloys Nitrocarburized after Cold Working

Hardening Behavior in Diffusion Zone of Fe–Mn and Fe–Cr Binary Alloys Nitrocarburized after Cold Working

Effect of Pre-heat Treatment on Hardening Behavior in Gas Nitrocarburized Carbon Steel

Wear Resistance of Industrial Pure Iron Treated by Nitriding and Quenching Followed by Aging Process

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