On the Ion Nitrided Layers of Iron Binary Alloys

Takase, Takao; Nakamura, Yasuhiko; Sumitomo, Makoto; Kita, Kiyoshi; Ono, Hyoe

doi:10.2320/jinstmet1952.40.7_663

Cited by 14 publications

(5 citation statements)

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“…39,40. In the literature, detailed information on the influence of Si on the compound-layer formation is lacking (for example, see Refs. [41][42][43]. Against this background, in this work Fe-Si alloys (Fe-2 at.…”

Section: Introductionmentioning

confidence: 96%

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Meka

Schubert

Bischoff

et al. 2020

Metall Mater Trans A

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The influence of Si, substitutionally dissolved in ferritic Fe-2 at. pct Si and Fe-4.5 at. pct Si alloys, on the nucleation and growth of c¢ iron nitride upon controlled gaseous nitriding was investigated. The nitrided specimens were characterized by XRD, light microscopy, TEM, EELS, EPMA and EBSD. The combination of difficult and thus delayed precipitation of (1) silicon nitride, because of a large misfit with the ferrite matrix, and (2) c¢ iron nitride, because of the negligible solubility of Si, was shown to lead to a series of unusual, nonequilibrium phenomena: high nitrogen supersaturation, development of Si-containing metastable c¢ phase of peculiar morphology, precipitation of amorphous silicon nitride in c¢ and development of e nitride at thermodynamic conditions unlikely to allow its formation.

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Section: Introductionmentioning

confidence: 96%

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Meka

Schubert

Bischoff

et al. 2020

Metall Mater Trans A

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“…Therefore, alloying of strong nitride forming elements, such as Ti, Al, V, Cr and so on, is necessary to obtain substantial surface hardening, and precipitation behaviours of alloy nitrides have been studied so far. [1][2][3][4][5][6][7][8][9][10][11][12][13] Equilibrium alloy nitrides for these elements are TiN, VN and CrN of NaCl (B1) structure and AlN of wurtzite (ZnS type) structure in usual steels. On the other hand, Jack 7 and Rickerby et al 8,9 investigated the microstructure of various gaseous nitrided Fe-Ti alloys and reported the formation of metastable mixed substitutional (M)-nitrogen (N) atom cluster based on indirect experiments.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of nanosized nitrides in plasma nitrided Fe–M (M = Al, Cr, Ti, V) alloys

Miyamoto

Tomio²,

Aota

et al. 2011

Materials Science and Technology

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Nanosized alloy nitrides or alloying element (M)-Nitrogen(N) cluster formed in plasma nitriding of Fe-M binary alloys were investigated by means of high resolution TEM. Specimen surface of the Fe-Cr alloys was hardened by the formation of disk shaped CrN of NaCl structure, which is ,2 nm thick and 10 nm in diameter. In nitrided Fe-Al specimen, two kinds of AlN nitrides of metastable NaCl type and stable wurtzite type were formed near the specimen surface. Both of these were much larger than CrN. Contrasting to these specimens, in nitrided Fe-Ti and Fe-V alloys, high density M-N clusters of few nanometres diameter, many of which were monolayered lying on {001} a , were formed, leading to larger hardness increase than that in Fe-Cr and Fe-Al alloys. The formation of M-N clusters in nitriding is explained by the thermodynamical analysis of phase separation between M/N poor and M/N rich bcc phases.

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“…Moreover, 0.3 pct Si is not able to increase the hardness in the internal nitriding layer, i.e., the diffusion layer. [21,22] 0.3 pct of Si is too little to increase Vickers hardness so much as to be seen in Figure 5. Therefore, the fine nitrides are the most likely to be manganese nitrides.…”

Section: A Nitriding Of the Ultrafine Ferrite-cementite Steelmentioning

confidence: 90%

Fatigue Properties of Nitrided Ultrafine Ferrite-Cementite Steels under Rotating Bending Fatigue Testing

Furuya

Hirukawa

Matsuoka

et al. 2008

Metall Mater Trans A

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Fatigue tests under rotating bending were conducted on nitrided ultrafine ferrite-cementite steels. The ultrafine ferrite-cementite steels included carbon-increased and phosphorus-added versions to investigate the effects of grain growth suppression during nitriding. In the carbonincreased versions, grain growth was successfully suppressed both in the nitrided layer and in the core region. On the other hand, the low-carbon versions showed grain growth in the core region, even in the phosphorus-added types, although grain growth was suppressed in the nitrided layer. In the fatigue tests, many of the nitrided specimens revealed fish-eye fractures originating from inclusions located in or beneath the nitrided layer. In spite of the occurrence of fish-eye fractures, the fatigue strength of the carbon-increased versions was markedly improved due to nitriding, whereas it was a little improved in the low-carbon versions. The fatigue strength of the nitrided specimens was closely related to hardness at the fracture origin, even when fish-eye fractures occurred. This was why nitriding markedly improved the fatigue strength of the carbon-increased versions in which grain growth was successfully suppressed and high hardness was maintained beneath the nitrided layer.

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On the Ion Nitrided Layers of Iron Binary Alloys

Cited by 14 publications

References 0 publications

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Unusual Iron Nitride Formation Upon Nitriding Fe-Si Alloy

Precipitation of nanosized nitrides in plasma nitrided Fe–M (M = Al, Cr, Ti, V) alloys

Fatigue Properties of Nitrided Ultrafine Ferrite-Cementite Steels under Rotating Bending Fatigue Testing

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