Investigation of small crack behaviour under cyclic loading in a dual phase steel with an FIB tomography technique

ABSTRACT Damage accumulation is investigated in the early stage of fatigue life in a ferritic martensitic dual phase steel. Microcrack initiation and propagation are influenced by microstructure, such as grain boundaries, grain orientation and/or phase distribution morphology. The dominant crack ini...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2007-06, Vol.30 (6), p.556-564
Main Authors: MOTOYASHIKI, Y., BRÜCKNER-FOIT, A., SUGETA, A.
Format: Article
Language:English
Subjects:
3-D analysis
Applied sciences
crack initiation
Cracks
Crystallography
dual phase steel
Dual phase steels
Electron back scatter diffraction
Engineering
Exact sciences and technology
Fatigue failure
Fatigue life
Ferrite
focussed ion beam (FIB)
Fracture mechanics
Materials fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microcracks
slip system
Steel
Three dimensional
Tomography
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Summary:ABSTRACT Damage accumulation is investigated in the early stage of fatigue life in a ferritic martensitic dual phase steel. Microcrack initiation and propagation are influenced by microstructure, such as grain boundaries, grain orientation and/or phase distribution morphology. The dominant crack initiation pattern is one in which microcracks are generated in a ferrite grain along slip bands inclined at a certain angle with respect to the loading direction. Subsurface observation with a focused ion beam (FIB) device and additional crystallographic characterization by means of the electron backscatter diffraction (EBSD) technique show that a slip system having a high Schmid factor value is activated and results in a crack nucleus. The FIB tomography technique with the help of EBSD measurement allows a three‐dimensional investigation of small crack behaviour to be performed.
ISSN:8756-758X
1460-2695
DOI:10.1111/j.1460-2695.2007.01130.x