International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments
Microstructural Change of Low Carbon and Low-Alloy Steels Caused by Hydrogen-Induced Fatigue-Crack Growth
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The effect of external high-pressure H2 gas on fatigue-crack growth behavior has been examined using low carbon ferritic-pearlitic and low-alloy tempered lath martensitic steels. The presence of hydrogen accelerates the crack-growth rate by ≈13-18 times compared to the uncharged state and shifts the fracture surface morphology from ductile striations to a mixture of “flat” and “quasi-cleavage” features for both steels. The common feature found in the microstructure immediately beneath the hydrogen-induced fracture surfaces is enhanced plasticity in terms of refined dislocation cell structures and refined sub-grains.