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  4. Effect of hydrogen in mixed gases on the mechanical properties of steels - theoretical background and review of test results
 
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2021
Journal Article
Title

Effect of hydrogen in mixed gases on the mechanical properties of steels - theoretical background and review of test results

Abstract
This review summarizes the thermodynamics of hydrogen (H2) in mixed gases of nitrogen (N2), methane (CH4) and natural gas, with a special focus on hydrogen fugacity. A compilation and interpretation of literature results for mechanical properties of steels as a function of hydrogen fugacity implies that test results obtained in gas mixtures and in pure hydrogen, both at the same fugacity, are equivalent. However, this needs to be verified experimentally. Among the test methods reviewed here, fatigue crack growth testing is the most sensitive method to measure hydrogen effects in pipeline steels followed by fracture toughness testing and tensile testing.
Author(s)
Michler, Thorsten  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Elsässer, Christian
Fraunhofer-Institut für Werkstoffmechanik IWM  
Wackeremann, Ken
Fraunhofer-Institut für Werkstoffmechanik IWM  
Schweizer, Frank  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Journal
Metals  
Funder
Fraunhofer-Gesellschaft FhG
Open Access
DOI
10.3390/met11111847
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • hydrogen embrittlement

  • hydrogen pressure

  • fugacity

  • pipeline steels

  • Gas Mixture

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