International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments
Fatigue Crack Growth in Austenitic Steel in Gaseous Hydrogen Environment
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Fatigue crack growth rates (FCGR) were measured on a high-strength austenitic stainless steel in moist air (∼40% RH), moist hydrogen (<∼50 vppm water vapor), dry hydrogen and dry helium (both <3 vppm water vapor). FCGR was the same in moist air and moist hydrogen environments at 30 Hz and were higher than those in dry hydrogen or dry helium. FCGR in dry hydrogen was comparable to that in air and moist hydrogen only when the cyclic loading frequency was reduced by up to four orders of magnitude suggesting that FCGR is limited by different rate limiting kinetic processes in moist and dry hydrogen. Two distinct fracture surface morphologies are present. Faceted fracture consistent with observations of twin boundary separation, is promoted at low ΔK and in dry environments. Flat transgranular fracture is promoted at higher ΔK and by moist environments. Fractographic evidence suggests the fracture path for flat transgranular fracture follows deformation bands.