Open AccessEstudo do efeito da tensão sobre a permeação por Hidrogênio em Aços API 5L X60 e API 5L X65
Author(s) -
Bruno Araújo Araújo,
Reginaldo Florêncio De Paiva Filho,
Eudésio Oliveira Vilar,
Misael Souto De Oliveira,
Antonio Almeida Silva
Publication year - 2017
Publication title -
principia/revista principia
Language(s) - English
Resource type - Journals
eISSN - 2447-9187
pISSN - 1517-0306
DOI - 10.18265/1517-03062015v1n37p18-26
Subject(s) - materials science , thermal diffusivity , permeation , stress (linguistics) , hydrogen , metallurgy , composite material , chemistry , thermodynamics , biochemistry , linguistics , philosophy , organic chemistry , membrane , physics
Under operating conditions, the oil and gas transmission pipelines can be subjected to high pressures and, at the same time, suffer the effect of acidic substances in the transported hydrocarbons such as H2S, whose action alone or combined with stresses acting in the structure can cause degradation processes of the mechanical properties of the material. Given the importance of the phenomenon, this work has as main objective the realization of hydrogen electrochemical permeation tests in API 5L X60 and API 5L X65 steels under mechanical loading conditions. A device for performing electrochemical permeation tests of hydrogen in the specimens subjected to stress was used for the tests. Thus, it was possible to observe experimentally the influence of stress on the diffusion properties during the experiment. By applying stress on the order of 20% of the yield strength, it was possible to verify the increase of diffusivity of API 5L X60 steel. Furthermore, there was a strong influence of the stress level of permeability, because a large increase of permeability of API 5L X65 steel. The results indicate that the lattice deformation due to imposed mechanical stress has a great influence on the diffusion properties of materials