Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性

Motomichi Koyama; Kishan Habib; Tatsuo Yokoi; Eisaku Sakurada; Nobuyuki Yoshimura; Kohsaku Ushioda; Kaneaki Tsuzaki; Hiroshi Noguchi

doi:10.2355/tetsutohagane.TETSU-2019-091

Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性

Translated title of the contribution: Thermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel

Motomichi Koyama, Kishan Habib, Tatsuo Yokoi, Eisaku Sakurada, Nobuyuki Yoshimura, Kohsaku Ushioda, Kaneaki Tsuzaki, Hiroshi Noguchi

Materials Design Division

Research output: Contribution to journal › Article › peer-review

Abstract

We investigated the effect of solute nitrogen on threshold stress intensity factor range, ΔK_th, of the growth of small cracks using a water-quenched Fe-0.011N (wt.%) binary alloy, in terms of strain-age hardening. Fatigue tests were carried out for micro-notched specimens at 20°C and 160°C at a frequency of 30 Hz with a stress ratio of –1. The nitrogen effect on ΔK_th at room temperature was significant, but smaller than the carbon effect. On the other hand, the thermal stability of the strain aging effect on ΔK_th was higher in the Fe-0.011N steel than in Fe-C steels containing supersaturated carbon, because the nitrogen solubility above room temperature is higher than the carbon solubility in ferritic steels.

Translated title of the contribution	Thermal Stability of Resistance to Propagation of Mechanically Small Fatigue-cracks in an Fe-N Binary Ferritic Steel
Original language	Japanese
Pages (from-to)	130-138
Number of pages	9
Journal	Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume	106
Issue number	6
DOIs	https://doi.org/10.2355/tetsutohagane.TETSU-2019-091
Publication status	Published - 2020 Jun

ASJC Scopus subject areas

Condensed Matter Physics
Physical and Theoretical Chemistry
Metals and Alloys
Materials Chemistry

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10.2355/tetsutohagane.TETSU-2019-091

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Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性. / Koyama, Motomichi; Habib, Kishan; Yokoi, Tatsuo; Sakurada, Eisaku; Yoshimura, Nobuyuki; Ushioda, Kohsaku; Tsuzaki, Kaneaki; Noguchi, Hiroshi.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 106, No. 6, 06.2020, p. 130-138.

Research output: Contribution to journal › Article › peer-review

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title = "Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性",

abstract = "We investigated the effect of solute nitrogen on threshold stress intensity factor range, ΔKth, of the growth of small cracks using a water-quenched Fe-0.011N (wt.%) binary alloy, in terms of strain-age hardening. Fatigue tests were carried out for micro-notched specimens at 20°C and 160°C at a frequency of 30 Hz with a stress ratio of –1. The nitrogen effect on ΔKth at room temperature was significant, but smaller than the carbon effect. On the other hand, the thermal stability of the strain aging effect on ΔKth was higher in the Fe-0.011N steel than in Fe-C steels containing supersaturated carbon, because the nitrogen solubility above room temperature is higher than the carbon solubility in ferritic steels.",

keywords = "High-cycle fatigue, Nitrogen steel, Small crack growth, Strain aging, Threshold stress intensity factor range",

author = "Motomichi Koyama and Kishan Habib and Tatsuo Yokoi and Eisaku Sakurada and Nobuyuki Yoshimura and Kohsaku Ushioda and Kaneaki Tsuzaki and Hiroshi Noguchi",

note = "Publisher Copyright: Copyright {\textcopyright} 2020 The Iron and Steel Institute of Japan",

year = "2020",

month = jun,

doi = "10.2355/tetsutohagane.TETSU-2019-091",

language = "Japanese",

volume = "106",

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AU - Koyama, Motomichi

AU - Habib, Kishan

AU - Yokoi, Tatsuo

AU - Sakurada, Eisaku

AU - Yoshimura, Nobuyuki

AU - Ushioda, Kohsaku

AU - Tsuzaki, Kaneaki

AU - Noguchi, Hiroshi

PY - 2020/6

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N2 - We investigated the effect of solute nitrogen on threshold stress intensity factor range, ΔKth, of the growth of small cracks using a water-quenched Fe-0.011N (wt.%) binary alloy, in terms of strain-age hardening. Fatigue tests were carried out for micro-notched specimens at 20°C and 160°C at a frequency of 30 Hz with a stress ratio of –1. The nitrogen effect on ΔKth at room temperature was significant, but smaller than the carbon effect. On the other hand, the thermal stability of the strain aging effect on ΔKth was higher in the Fe-0.011N steel than in Fe-C steels containing supersaturated carbon, because the nitrogen solubility above room temperature is higher than the carbon solubility in ferritic steels.

AB - We investigated the effect of solute nitrogen on threshold stress intensity factor range, ΔKth, of the growth of small cracks using a water-quenched Fe-0.011N (wt.%) binary alloy, in terms of strain-age hardening. Fatigue tests were carried out for micro-notched specimens at 20°C and 160°C at a frequency of 30 Hz with a stress ratio of –1. The nitrogen effect on ΔKth at room temperature was significant, but smaller than the carbon effect. On the other hand, the thermal stability of the strain aging effect on ΔKth was higher in the Fe-0.011N steel than in Fe-C steels containing supersaturated carbon, because the nitrogen solubility above room temperature is higher than the carbon solubility in ferritic steels.

KW - High-cycle fatigue

KW - Nitrogen steel

KW - Small crack growth

KW - Strain aging

KW - Threshold stress intensity factor range

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Fe-N 二元フェライト鋼における微小疲労き裂進展抵抗の熱的安定性

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