Microstructural effects on fatigue crack growth behavior of a microalloyed steel

Fatigue Crack Growth and Fracture Toughness in a Dual Phase Steel: Effect of Increasing Martensite Volume Fraction

“…This indicates the increase of fatigue crack resistance. A similar phenomenon was reported by other authors; Laurito et al [35] mention that in the heat-treated conditions, the harder phases scattered over the softer ferritic phase, thus creating a tendency if the crack to deviate from these phases and to propagate principally through the ferrite, resulting in a more complex crack path, decreasing the fatigue crack growth velocity, Akay et al [36] shows that increasing of harder phase (martensite) on low carbon steel results in an increase of fatigue life, Idris et al [37] mentions that when the martensite volume fraction increases, there is more possibility that the cracks find martensite islands on their way, which makes the crack path much difficult, decreasing the crack propagation velocity. This is according to the reported by Zhao et al [38], who mentions that the exists directly the relationship between the fatigue limit and tensile strength, which occurs when increasing in a tensile strength results in an increase on fatigue limit, which is possible achieve when increasing the martensite content in the dual phase steel.…”

The influence of microstructure on the fatigue crack growth rate in marine steels in the Paris Region

“…Q345 is common structural steel in China and used in the nuclear industry and petrochemical plants. Laurito 53 studied FCGR in intercritical isothermally quenched grain modified steel designated as RD480. Though the chemical composition is comparable with other steels, the properties of the microstructure generated may differ significantly due to this heat treatment.…”

Contributions of Grain Size and Crystal Orientation to Fatigue Crack Deflection and Branching Behavior in Low Carbon Steel Plates

“…The similar effects of pearlite particle morphology have been observed in the references. [11][12][13] It has been also clarified that these enhanced fatigue crack growth resistances are attributed to the effects not only of crack closure but also of crack tip stress shielding due to crack deflection, branching and friction contacts of crack surfaces in the crack wake. 14) There have been lots of works on crack closure and crack tip stress shielding behavior from the mechanical point of view.…”