Microstructural based hydrogen diffusion and trapping models applied to Fe–C X alloys

Andreas Drexler, Tom Depover, Silvia Leitner, Kim Verbeken, Werner Ecker

Research output: Contribution to journalArticle

Abstract

Hydrogen embrittlement of modern high strength steels consists of different interacting time-dependent mechanisms. One of these mechanisms is hydrogen diffusion and trapping to accumulate hydrogen in critical areas with high mechanical loads. Therefore, understanding hydrogen diffusion and trapping behavior of carbides containing high strength steels is an essential part to effectively increase the hydrogen resistance. For that purpose, a microstructural based model was developed and parametrized to Fe–C–V and Fe–C–Ti alloys. Generalized analytical equations were derived to describe the evolution of different kinds of trap densities with the measured carbide mean radius, annealing temperature or dislocation density. Finally, the models support the idea of hydrogen trapping at carbon vacancies and coherent interface positions. In future, these models are well suited for finite element process simulations of industrial components to predict the local solubility and chemical diffusion as demonstrated in the last section of this work.

Original languageEnglish
Article number154057
JournalJournal of Alloys and Compounds
Volume826
DOIs
Publication statusPublished - Jun 2020
Externally publishedYes

Keywords

  • Carbides
  • Finite element modeling (FEM)
  • Hydrogen embrittlement (HE)
  • Microstructural modeling
  • Thermal desorption spectroscopy (TDS)
  • Trapping

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fields of Expertise

  • Advanced Materials Science

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