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Metallurgical Transactions A

, Volume 8, Issue 7, pp 1043–1053 | Cite as

Gaseous hydrogen embrittlement of high strength steels

  • R. P. Gangloff
  • R. P. Wei
Environmental Interactions

Abstract

The kinetics of sustained-load subcritical crack growth in hydrogen were determined for 18Ni(200) and 18Ni(250) maraging steels over a range of hydrogen pressures and temperatures. Crack growth in each steel was characterized by an apparent threshold stress intensity, a domain where the growth rate increased sharply with stress intensity (K) (Stage I), and a range where the growth rate was independent ofK (Stage II). The rate-limited Stage II crack growth in these steels exhibited three distinct regions of temperature dependency, with a different isothermal pressure dependence in each region. In the low temperature region, Stage II crack growth was thermally activated with δH = 18.2 ±1.7 kj/mol; (δH being independent of hydrogen pressure and yield strength). The growth rates at a givenK were proportional to the square root of hydrogen pressure. In the intermediate temperature region, Stage II growth rates increased at slower rates, passed through a maximum and then decreased with increasing temperature. Within this region, the pressure dependence for crack growth increased from 1/2-power to 2.0-power with increasing temperature. Above a transition temperature, each grade of maraging steel became essentially immune to gaseous hydrogen embrittlement for the hydrogen pressure range considered. The transition temperature was strongly affected by yield strength and hydrogen pressure. Plausible explanations for these phenomenological results are considered.

Keywords

Metallurgical Transaction Stress Intensity Factor Crack Growth Rate Hydrogen Pressure Maraging Steel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical of Society of AIME 1977

Authors and Affiliations

  • R. P. Gangloff
    • 1
  • R. P. Wei
    • 2
  1. 1.General Electric Corporate Research and Development CenterUSA
  2. 2.Department of Mechanical Engineering and MechanicsLehigh UniversityUSA

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