Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel

Shohei Ueki; Yoji Mine; Xinyu Lu; Yu Lung Chiu; Paul Bowen; Kazuki Takashima

doi:10.1016/j.scriptamat.2021.114045

Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel

Shohei Ueki, Yoji Mine^*, Xinyu Lu, Yu Lung Chiu, Paul Bowen, Kazuki Takashima

^*Corresponding author for this work

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

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Abstract

Strain accumulation ahead of the fatigue crack tip in the martensite lath of a medium-carbon steel was examined using a three-dimensional electron backscatter diffraction (3D-EBSD) technique. The objective of this study is to explain the crack propagation mechanism due to the activation of out-of-plane slips with their Burgers vectors having no component of the crack growth direction, which exhibits high resistance to fatigue crack growth. The 3D-EBSD analysis revealed little misorientation in the crystal, concurrent with the fatigue crack propagation in the coarse laths oriented favourably for dislocation glide in their longitudinal directions. This suggests that these laths contributed to strain accommodation. In contrast, strain preferentially accumulated in the coarse laths oriented unfavorably for the longitudinal slip, promoting crack propagation. These indicate that the geometrical anisotropy and distribution of martensite laths dominate the fatigue crack propagation resistance in martensitic carbon steel.

Original language	English
Article number	114045
Number of pages	6
Journal	Scripta Materialia
Volume	203
Early online date	12 Jun 2021
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114045
Publication status	Published - Oct 2021

Bibliographical note

Funding Information:
The authors are indebted to Mr. Yosuke Maeguchi, Kumamoto University, for his assistance in micro-mechanical tests. This work was supported in part by a Grant-in-Aid for Scientific Research (A) JP20H00311 and (B) JP19H02464 from the Japan Society for the Promotion of Science (JSPS). SU gratefully acknowledges the support of the ‘JSPS Overseas Challenge Program for Young Researchers’. This study used the plasma-FIB microscope at the centre for Electron Microscopy at the University of Birmingham, UK.

Publisher Copyright:
© 2021

Keywords

Deformation structure
Fatigue
Martensitic steels
Micro-mechanical test
Slip

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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title = "Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel",

abstract = "Strain accumulation ahead of the fatigue crack tip in the martensite lath of a medium-carbon steel was examined using a three-dimensional electron backscatter diffraction (3D-EBSD) technique. The objective of this study is to explain the crack propagation mechanism due to the activation of out-of-plane slips with their Burgers vectors having no component of the crack growth direction, which exhibits high resistance to fatigue crack growth. The 3D-EBSD analysis revealed little misorientation in the crystal, concurrent with the fatigue crack propagation in the coarse laths oriented favourably for dislocation glide in their longitudinal directions. This suggests that these laths contributed to strain accommodation. In contrast, strain preferentially accumulated in the coarse laths oriented unfavorably for the longitudinal slip, promoting crack propagation. These indicate that the geometrical anisotropy and distribution of martensite laths dominate the fatigue crack propagation resistance in martensitic carbon steel.",

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note = "Funding Information: The authors are indebted to Mr. Yosuke Maeguchi, Kumamoto University, for his assistance in micro-mechanical tests. This work was supported in part by a Grant-in-Aid for Scientific Research (A) JP20H00311 and (B) JP19H02464 from the Japan Society for the Promotion of Science (JSPS). SU gratefully acknowledges the support of the {\textquoteleft}JSPS Overseas Challenge Program for Young Researchers{\textquoteright}. This study used the plasma-FIB microscope at the centre for Electron Microscopy at the University of Birmingham, UK. Publisher Copyright: {\textcopyright} 2021",

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AU - Bowen, Paul

AU - Takashima, Kazuki

N1 - Funding Information: The authors are indebted to Mr. Yosuke Maeguchi, Kumamoto University, for his assistance in micro-mechanical tests. This work was supported in part by a Grant-in-Aid for Scientific Research (A) JP20H00311 and (B) JP19H02464 from the Japan Society for the Promotion of Science (JSPS). SU gratefully acknowledges the support of the ‘JSPS Overseas Challenge Program for Young Researchers’. This study used the plasma-FIB microscope at the centre for Electron Microscopy at the University of Birmingham, UK. Publisher Copyright: © 2021

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N2 - Strain accumulation ahead of the fatigue crack tip in the martensite lath of a medium-carbon steel was examined using a three-dimensional electron backscatter diffraction (3D-EBSD) technique. The objective of this study is to explain the crack propagation mechanism due to the activation of out-of-plane slips with their Burgers vectors having no component of the crack growth direction, which exhibits high resistance to fatigue crack growth. The 3D-EBSD analysis revealed little misorientation in the crystal, concurrent with the fatigue crack propagation in the coarse laths oriented favourably for dislocation glide in their longitudinal directions. This suggests that these laths contributed to strain accommodation. In contrast, strain preferentially accumulated in the coarse laths oriented unfavorably for the longitudinal slip, promoting crack propagation. These indicate that the geometrical anisotropy and distribution of martensite laths dominate the fatigue crack propagation resistance in martensitic carbon steel.

AB - Strain accumulation ahead of the fatigue crack tip in the martensite lath of a medium-carbon steel was examined using a three-dimensional electron backscatter diffraction (3D-EBSD) technique. The objective of this study is to explain the crack propagation mechanism due to the activation of out-of-plane slips with their Burgers vectors having no component of the crack growth direction, which exhibits high resistance to fatigue crack growth. The 3D-EBSD analysis revealed little misorientation in the crystal, concurrent with the fatigue crack propagation in the coarse laths oriented favourably for dislocation glide in their longitudinal directions. This suggests that these laths contributed to strain accommodation. In contrast, strain preferentially accumulated in the coarse laths oriented unfavorably for the longitudinal slip, promoting crack propagation. These indicate that the geometrical anisotropy and distribution of martensite laths dominate the fatigue crack propagation resistance in martensitic carbon steel.

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Effect of geometric lath orientation on fatigue crack propagation via out-of-plane dislocation glide in martensitic steel

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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