Initiation of hydrogen induced cracks at secondary phase particles
Aurélie Laureys, Margot Pinson, Lisa Claeys, tim Deseranno, Tom Depover, Kim Verbeken
Abstract
The goal of this work is to propose a general mechanism for hydrogen induced crack initiation in steels based on a microstructural study of multiple steel grades. Four types of steels with strongly varying microstructures are studied for this purpose, i.e. ultra low carbon (ULC) steel, TRIP (transformation induced plasticity) steel, Fe-C-Ti generic alloy, and pressure vessel steel. A strong dependency of the initiation of hydrogen induced cracks on the microstructural features in the materials is observed. By use of SEM-EBSD characterization, initiation is found to always occur at the hard secondary phase particles in the materials.
Topics & Concepts
Materials scienceElectron backscatter diffractionPlasticityMicrostructureMetallurgyAlloyHydrogenPhase (matter)Carbon steelComposite materialChemistryOrganic chemistryCorrosionHydrogen embrittlement and corrosion behaviors in metalsNuclear Materials and PropertiesMaterial Properties and Failure Mechanisms