Conformity between Mechanics and Microscopic Functions of Hydrogen in Failure
2012; The Iron and Steel Institute of Japan; Volume: 52; Issue: 2 Linguagem: Inglês
10.2355/isijinternational.52.168
ISSN1347-5460
Autores Tópico(s)Nuclear Materials and Properties
ResumoConformity between macro-mechanics and microscopic functions of hydrogen in failure is reviewed in reference to some models of hydrogen embrittlement (HE), focusing on the role of plasticity. Plastic strain localization, a characteristic feature of HE, is consistent with the hydrogen-enhanced creation of vacancies during plastic deformation. Constitutive relations that take into account the presence of voids describe well the ductile fracture process in HE. The effect of hydrogen on increasing the density of strain-induced vacancies likely promotes plastic instability and decreases ductile crack growth resistance, thus leading to enhanced shear localization and a premature failure.
Referência(s)