Finite difference modelling for understanding the hydrogen assisted cracking in virtual slow strain rate tensile tests

  1. Artola, Garikoitz
  2. Aldazabal, Javier
Revista:
Revista de metalurgia

ISSN: 0034-8570

Año de publicación: 2021

Título del ejemplar: Online First; e201

Volumen: 57

Número: 3

Páginas: 198-198

Tipo: Artículo

DOI: 10.3989/REVMETALM.198 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Revista de metalurgia

Resumen

Se han observado distintos patrones de agrietamiento inducido por hidrógeno en dos aceros pertenecientes al mismo grado para el fondeo de estructuras offshore, cuando son ensayados a tracción a baja velocidad de deformación. Se plantea la hipótesis de que este comportamiento se debe a diferencias en la capacidad de atrape de hidrógeno de ambos aceros. De cara a evaluar la factibilidad de esta hipótesis se propone utilizar una nueva estrategia de modelización mediante diferencias finitas. El modelo está diseñado para emular el efecto del hidrógeno difusible y el hidrógeno atrapado en la nucleación y el crecimiento de grietas durante los ensayos referidos y, en consecuencia, durante la vida en servicio. El efecto de las diferencias en la capacidad de atrape de hidrógeno se ha simulado utilizando el modelo de tensión-difusión-resistencia propuesto. En las simulaciones, un mayor contenido en trampas de hidrógeno ha dado lugar a una menor densidad de grietas, mientras que la ausencia de trampas ha dado lugar a una menor densidad de grietas. Estos resultados se alienan con la hipótesis de partida, dado que las variaciones en capacidad de atrape han modificado el número de grietas nucleadas.

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