Metallurgical Transactions A

, Volume 7, Issue 2, pp 235–241 | Cite as

Hydrogen enhanced crack growth in 18 Ni maraging steels

  • S. J. Hudak
  • R. P. Wei
Mechanical Behavior


The kinetics of sustained-load subcritical crack growth for 18 Ni maraging steels in high purity hydrogen are examined using crack-tip stress intensity,K, as a measure of crack driving force. Crack growth rate as a function of stress intensity exhibited a clearly definedK-independent stage (Stage II). Crack growth rates in an 18 Ni (250) maraging steel are examined for temperatures from -60°C to 100°C. A critical temperature was observed above which crack growth rates became diminishingly small. At lower temperatures the activation energy for Stage II crack growth was found to be 16.7 ± 3.3 kJ/mole. Temperature and hydrogen partial pressure are shown to interact in a complex manner to determine the apparentK th and the crack growth behavior. Comparison of results on ‘250’ and ‘300’ grades of 18 Ni maraging steel indicate a significant influence of alloy composition and/or strength level on the crack growth behavior. These phenomenological observations are discussed in terms of possible underlying controlling processes.


Crack Growth Rate High Strength Steel Hydrogen Embrittlement Maraging Steel Crack Growth Behavior 
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Copyright information

© The Metallurgical of Society of AIME 1976

Authors and Affiliations

  • S. J. Hudak
    • 1
  • R. P. Wei
    • 2
  1. 1.Westinghouse Research LaboratoriesPittsburgh
  2. 2.Lehigh UniversityBethlehem

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