Dislocation motion at a fatigue crack tip in a high-nitrogen steel clarified through in situ electron channeling contrast imaging

Kishan Habib; Motomichi Koyama; Toshihiro Tsuchiyama; Hiroshi Noguchi

doi:10.1016/j.matchar.2019.109930

Dislocation motion at a fatigue crack tip in a high-nitrogen steel clarified through in situ electron channeling contrast imaging

Kishan Habib, Motomichi Koyama, Toshihiro Tsuchiyama, Hiroshi Noguchi

Strength of materials

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11 Citations (Scopus)

Abstract

The dislocation motion was observed at the tip of a fatigue crack in the high nitrogen steel (HNS) by in situ test through electron channeling contrast imaging. No dislocation motion was observed near the crack tip even at a stress amplitude higher than the fatigue limit. In contrast, dislocation pileup was observed a bit from the crack tip with very narrow dislocation spacing. In addition, with increasing number of cycles, the dislocations were extended to stacking fault. The stacking fault showed a reversible behavior of shrink and expansion, which may influence in enhancing the crack growth resistance of the HNS.

Original language	English
Article number	109930
Journal	Materials Characterization
Volume	158
DOIs	https://doi.org/10.1016/j.matchar.2019.109930
Publication status	Published - Dec 2019

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matchar.2019.109930

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title = "Dislocation motion at a fatigue crack tip in a high-nitrogen steel clarified through in situ electron channeling contrast imaging",

abstract = "The dislocation motion was observed at the tip of a fatigue crack in the high nitrogen steel (HNS) by in situ test through electron channeling contrast imaging. No dislocation motion was observed near the crack tip even at a stress amplitude higher than the fatigue limit. In contrast, dislocation pileup was observed a bit from the crack tip with very narrow dislocation spacing. In addition, with increasing number of cycles, the dislocations were extended to stacking fault. The stacking fault showed a reversible behavior of shrink and expansion, which may influence in enhancing the crack growth resistance of the HNS.",

author = "Kishan Habib and Motomichi Koyama and Toshihiro Tsuchiyama and Hiroshi Noguchi",

note = "Funding Information: This work was financially supported by JSPS KAKENHI ( JP16H06365 ). MK are grateful to “Kazato Reaserch Foundation” for the financial support of this work. Appendix A Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",

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AU - Koyama, Motomichi

AU - Tsuchiyama, Toshihiro

AU - Noguchi, Hiroshi

N1 - Funding Information: This work was financially supported by JSPS KAKENHI ( JP16H06365 ). MK are grateful to “Kazato Reaserch Foundation” for the financial support of this work. Appendix A Publisher Copyright: © 2019 Elsevier Inc.

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N2 - The dislocation motion was observed at the tip of a fatigue crack in the high nitrogen steel (HNS) by in situ test through electron channeling contrast imaging. No dislocation motion was observed near the crack tip even at a stress amplitude higher than the fatigue limit. In contrast, dislocation pileup was observed a bit from the crack tip with very narrow dislocation spacing. In addition, with increasing number of cycles, the dislocations were extended to stacking fault. The stacking fault showed a reversible behavior of shrink and expansion, which may influence in enhancing the crack growth resistance of the HNS.

AB - The dislocation motion was observed at the tip of a fatigue crack in the high nitrogen steel (HNS) by in situ test through electron channeling contrast imaging. No dislocation motion was observed near the crack tip even at a stress amplitude higher than the fatigue limit. In contrast, dislocation pileup was observed a bit from the crack tip with very narrow dislocation spacing. In addition, with increasing number of cycles, the dislocations were extended to stacking fault. The stacking fault showed a reversible behavior of shrink and expansion, which may influence in enhancing the crack growth resistance of the HNS.

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Dislocation motion at a fatigue crack tip in a high-nitrogen steel clarified through in situ electron channeling contrast imaging

Abstract

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