Quantitative investigation on deep hydrogen trapping in tempered martensitic steel

Rongjian Shi, Lin Chen, Zidong Wang, Xu Sheng Yang, Lijie Qiao, Xiaolu Pang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

In this work, the correlation between different microstructural components and hydrogen trapping with high density in tempered niobium carbide (NbC)-precipitated martensitic steel was quantitatively investigated using a combination of electrochemical hydrogen permeation experiments and thermal desorption spectroscopy. The martensite lath and a high density of dislocations, which constitute the reversible hydrogen trapping sites, with a density of 2.24 × 1020 cm−3 in Fe-0.05C-1.10Mn-4.50Ni-0.50Cr-0.50Mo-0.05Nb wt.% martensitic steel. The dislocation with high density could disperse the hydrogen distribution. Furthermore, the uniformly distributed NbC nanoprecipitates, the high-angle grain boundaries, and the grain-boundary precipitates were found to act as irreversible hydrogen traps, with a density of 1.00 × 1020 cm−3. These deep hydrogen trapping sites could not only trap hydrogen irreversibly, but also can inhibit the accumulation of hydrogen. The interpretation of hydrogen trapping is significant to enhance the hydrogen embrittlement resistance of high-strength martensitic steels.

Original languageEnglish
Article number157218
JournalJournal of Alloys and Compounds
Volume854
DOIs
Publication statusPublished - 15 Feb 2021

Keywords

  • Hydrogen embrittlement
  • Hydrogen traps
  • Martensitic steels
  • Precipitation
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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