Hydrogen effects in multiaxial fracture of cold-drawn pearlitic steel wires

[Display omitted] •Hydrogen enhances the effect of microstructural anisotropy on fracture surface.•H promotes crack path deflection (mixed-mode growth) in cold drawn pearlitic steel.•H diffusing at diverse planes causes multicraking in notched samples of drawn steel.•Oriented microstructure induces...

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Bibliographic Details
Published in:Engineering fracture mechanics 2017-04, Vol.174, p.243-252
Main Authors: Toribio, J., Vergara, D., Lorenzo, M.
Format: Article
Language:English
Subjects:
Anisotropy
Cold drawing
Crack propagation
Cracking (fracturing)
Deflection
Fatigue cracking
Fatigue failure
Fracture mechanics
Fractures
Hydrogen
Hydrogen embrittlement
Materials fatigue
Microstructural orientation
Microstructure
Pearlitic steels
Steel
Strength anisotropy
Tearing
Topography
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Summary:[Display omitted] •Hydrogen enhances the effect of microstructural anisotropy on fracture surface.•H promotes crack path deflection (mixed-mode growth) in cold drawn pearlitic steel.•H diffusing at diverse planes causes multicraking in notched samples of drawn steel.•Oriented microstructure induces strength anisotropy leading to multi-axial fracture.•Fracture process zone is shifted to the wire centre in drawn wires (H environment). Heavily drawn pearlitic steel wires have a markedly oriented microstructure as a consequence of the manufacturing process by cold drawing, thereby becoming anisotropic materials in the matter of fatigue and fracture behaviour. Such a micro-arrangement influences hydrogen assisted fracture (HAF) and produces multiaxial fracture in the form of cracking path deflection. In this paper, the influence of microstructural anisotropy in cold-drawn pearlitic steels on the hydrogen-assisted micro-damage path is analysed in terms of the so-called tearing topography surface (TTS). Results reveal that hydrogen enhances the key role of the oriented microstructure in the anisotropic behaviour.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2016.12.020