Hydrogen-affected fatigue crack propagation at various loading frequencies and gaseous hydrogen pressures in commercially pure iron

•Intergranular fracture occurs without clear modification in crack tip plasticity.•Transgranular fracture occurs with great reduction of crack tip plasticity.•Crack tip plasticity reduction is associated with fatigue crack growth enhancement.•Mechanism models of hydrogen-affected fatigue crack growt...

Full description

Saved in:
Bibliographic Details
Published in:International journal of fatigue 2019-04, Vol.121, p.197-207
Main Authors: Shinko, Tomoki, Hénaff, Gilbert, Halm, Damien, Benoit, Guillaume, Bilotta, Giovambattista, Arzaghi, Mandana
Format: Article
Language:English
Subjects:
Acoustics
Automatic
Biomechanics
Chemical Sciences
Coalescing
Commercially pure iron
Crack propagation
Crack tip plasticity
Crack tips
Electric power
Electromagnetism
Engineering Sciences
Fatigue crack propagation
Fatigue failure
Fluid mechanics
Fracture mechanics
Gas pressure
Grain boundaries
Hydrogen
Hydrogen embrittlement
Intergranular fracture
Iron
Material chemistry
Materials and structures in mechanics
Materials fatigue
Mathematical Physics
Mechanics
Physics
Polymers
Quantum Physics
Reactive fluid environment
Sharpening
Stress intensity factors
Thermics
Vibrations
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Intergranular fracture occurs without clear modification in crack tip plasticity.•Transgranular fracture occurs with great reduction of crack tip plasticity.•Crack tip plasticity reduction is associated with fatigue crack growth enhancement.•Mechanism models of hydrogen-affected fatigue crack growth are proposed.•Frequency and hydrogen pressure dependencies can be explained by proposed models. Hydrogen-Affected Fatigue Crack Growth (HAFCG) in commercially pure iron has been characterized in terms of hydrogen gas pressure, loading frequency and stress intensity factor range ΔK. A higher hydrogen gas pressure decreases the critical value of ΔK triggering the HAFCG enhancement, and a lower loading frequency increases the HAFCG enhancement. Intergranular FCG in the non-accelerated regime is likely caused by the hydrogen-induced microvoid coalescence along the grain boundary, while a brittle cyclic cleavage fracture in the accelerated regime can be explained in terms of crack tip sharpening and hydrogen-enhanced decohesion process.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2018.12.009