RT info:eu-repo/semantics/article
T1 Influence of charging conditions on simulated temperature-programmed desorption for hydrogen in metals
A1 Díaz Portugal, Andrés
A1 Cuesta Segura, Isidoro Iván
A1 Martínez Pañeda, Emilio
A1 Alegre Calderón, Jesús Manuel
K1 Hydrogen trapping
K1 Thermal desorption
K1 Gaseous charging
K1 Finite Element modelling
K1 Resistencia de materiales
K1 Strength of materials
AB Failures attributed to hydrogen embrittlement are a major concern for metals so a better understanding of damage micro-mechanisms and hydrogen diffusion within the metal is needed. Local concentrations depend on transport phenomena including trapping effects, which are usually characterised by a temperature-programmed desorption method often referred to as Thermal Desorption Analysis (TDA). When the hydrogen is released from the specimen during the programmed heating, some desorption peaks are observed that are commonly related to detrapping energies by means of an analytical procedure. The limitations of this approach are revisited here and gaseous hydrogen charging at high temperatures is simulated. This popular procedure enables attaining high concentrations due to the higher solubility of hydrogen at high temperatures. However, the segregation behaviour of hydrogen into traps depends on charging time and temperature. This process and the subsequent cooling alter hydrogen distribution are numerically modelled; it is found that TDA spectra are strongly affected by the charging temperature and the charging time, both for weak and strong traps. However, the influence of ageing time at room temperature after cooling and before desorption is only appreciable for weak traps.
PB Elsevier
SN 0360-3199
YR 2020
FD 2020-09
LK http://hdl.handle.net/10259/5662
UL http://hdl.handle.net/10259/5662
LA eng
NO Ministry of Economy and Competitiveness of Spain through grants MAT2014-58738 and RTI2018-096070-B-C33.
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024