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

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

9 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

Access to Document

10.1016/j.matchar.2019.109930

Cite this

@article{1bb896c3d15a4a1d8c738fd42d03df05,

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.",

year = "2019",

month = dec,

doi = "10.1016/j.matchar.2019.109930",

language = "English",

volume = "158",

journal = "Materials Characterization",

issn = "1044-5803",

publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Dislocation motion at a fatigue crack tip in a high-nitrogen steel clarified through in situ electron channeling contrast imaging

AU - Habib, Kishan

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.

PY - 2019/12

Y1 - 2019/12

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.

UR - http://www.scopus.com/inward/record.url?scp=85075463003&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85075463003&partnerID=8YFLogxK

U2 - 10.1016/j.matchar.2019.109930

DO - 10.1016/j.matchar.2019.109930

M3 - Article

AN - SCOPUS:85075463003

VL - 158

JO - Materials Characterization

JF - Materials Characterization

SN - 1044-5803

M1 - 109930

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this