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  4. Gaseous hydrogen charging and fatigue testing on IN718
 
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2022
Conference Paper
Title

Gaseous hydrogen charging and fatigue testing on IN718

Abstract
IN718 is a precipitation hardened nickel-based superalloy, which is well known for its high strength, good corrosion and creep resistance from low to high temperatures. It is therefore a popular material for numerous applications. Nevertheless, it is known that hydrogen can strongly affect the mechanical properties of IN718. Some questions still need to be clarified to ensure the safe use of components in a hydrogen environment. In this work, the hydrogen uptake in a gaseous hydrogen environment and tensile and fatigue properties of pre-charged IN718 were investigated. Specimen were charged at 350°C and 100 bar hydrogen pressure. It turned out, that saturation was reached after 10 days with a hydrogen content of about 27 wppm. Tensile tests showed a loss of elongation to failure and reduction of area for the pre-charged specimen. Hydrogen effects were also evident in the low cycle fatigue test. The cycles to failure were significantly reduced. Investigations of the fracture surfaces showed clear differences in crack growth of non-charged and pre-charged tensile and fatigue specimen.
Author(s)
Ebling, Fabien
Fraunhofer-Institut für Werkstoffmechanik IWM  
Wackermann, Ken  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Mainwork
ASME Pressure Vessels and Piping Conference, PVP 2022. Proceedings. Vol.4B: Materials and Fabrication  
Conference
Pressure Vessels and Piping Conference 2022  
DOI
10.1115/PVP2022-84184
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • Hydrogen embrittlement

  • gaseous hydrogen charging

  • hydrogen measurements

  • low cycle fatigue (LCF) testing

  • IN718

  • tensile testing

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