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.
KW - Crack coalescence
KW - Dislocations motion
KW - Electron channeling contrast imaging
KW - High nitrogen steel
KW - In situ test
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U2 - 10.1016/j.matchar.2019.109930
DO - 10.1016/j.matchar.2019.109930
M3 - Article
AN - SCOPUS:85075463003
SN - 1044-5803
VL - 158
JO - Materials Characterization
JF - Materials Characterization
M1 - 109930
ER -