Microscopic mechanism of hydrogen embrittlement in fatigue and fracture

Yukitaka Murakami, Junichiro Yamabe, Hisao Matsunaga

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

The microscope mechanism of hydrogen embrittlement (HE) is overviewed from the viewpoint of Mechanics-Microstructure-Environment Interactions. The plastic deformation (Mechanics) at crack tip for low strength steel is controlled by hydrogen concentration (Environment) to crack tip, eventually resulting in very strong time dependent phenomenon in static fracture and fatigue crack growth. Various typical phenomena in low strength steels which can be understood from the viewpoint of Mechanics-Environment Interactions will be presented. Fracture and fatigue of high strength steels (Microstructure) are strongly influenced by hydrogen. Especially, fatigue crack growth is remarkably accelerated by hydrogen-induced deformation twins. The HE phenomemon of the high-strength steels was applied to a newly inclusion rating method. Hydrogen trapped by nonmetalliec inclusions causes the elimination of fatigue limit at very high cycle fatigue. The values of threshold stress intensity factor KTH in hydrogen for small cracks are much smaller than those for long cracks measured by the standard WOL or CT specimens, which are eventually unconservative for the design of hydrogen components. This phenomenon is similar to the small crack problem in fatigue.

Original languageEnglish
Title of host publicationMaterials Structure and Micromechanics of Fracture VII
Pages3-13
Number of pages11
DOIs
Publication statusPublished - Jan 14 2014
Event7th International Conference on Materials Structure and Micromechanics of Fracture, MSMF 2013 - Brno, Czech Republic
Duration: Jul 1 2013Jul 3 2013

Publication series

NameKey Engineering Materials
Volume592-593
ISSN (Print)1013-9826

Other

Other7th International Conference on Materials Structure and Micromechanics of Fracture, MSMF 2013
CountryCzech Republic
CityBrno
Period7/1/137/3/13

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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