Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V

M. Hassanipour, Satoshi Watanabe, Kyosuke Hirayama, Hiroyuki Toda, K. Uesugi, A. Takeuchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Currently, short crack growth behavior and rate variations are not well understood in the literature. This is due to lack of studies regarding the interaction between 3D short crack and microstructure and its effect on crack growth. In order to study this interaction, in situ computed tomography was performed to measure crack growth at sub-grain level (every 5 µm) during a fatigue test in a bimodal Ti-6Al-4V alloy for two crack front regions. This was followed by serial sectioning coupled with electron backscattering diffraction (EBSD) to identify the short crack growth in the microstructure, i.e. α α + β phases and interface. Results show that crack growth has the highest rate in α phase as compared to the α + β phase and the interface in both regions. The crack grows preferably into α phase when compared to the average microstructural fraction in the first region, but it decreases below this fraction in the second region. The crack grows mainly close to crystallographic planes in α grains with the maximum shear stress (favorable planes) in the first region. As the short crack grows into the second region, there is an increase in number of grains enclosed in the plastic zone size. As a result, there is a decrease in the mismatch angle between neighboring cracked grains, which leads to higher deviation from favorable planes causing a local variation in crack growth rate.

Original languageEnglish
Pages (from-to)229-237
Number of pages9
JournalMaterials Science and Engineering A
Volume738
DOIs
Publication statusPublished - Dec 19 2018

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short cracks
Crack propagation
cracks
microstructure
Microstructure
Cracks
interactions
Backscattering
fatigue tests
Tomography
Shear stress
shear stress
Diffraction
Fatigue of materials
backscattering
Plastics
plastics
tomography
Electrons
deviation

All Science Journal Classification (ASJC) codes

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

Cite this

Short crack growth behavior and its transitional interaction with 3D microstructure in Ti-6Al-4V. / Hassanipour, M.; Watanabe, Satoshi; Hirayama, Kyosuke; Toda, Hiroyuki; Uesugi, K.; Takeuchi, A.

In: Materials Science and Engineering A, Vol. 738, 19.12.2018, p. 229-237.

Research output: Contribution to journalArticle

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