Abstract
Hydrogen refueling infrastructure for fuel cell vehicles requires weld joints for high-pressure piping. Thus characterization of the effect of hydrogen on the fatigue strength of piping welds is necessary. Here, fatigue strength of the weld jointed pipe, which is made of high-nitrogen stainless steel XM19, was investigated. At first, a fatigue test method to simulate fatigue due to inner pressure cycle in an efficient way was developed. The microstructure of the weld metal was dendrite and small δ-ferrite grains. The fatigue strength of the hydrogen-charged specimen was the same as that of the uncharged one. There was no significant change in the fatigue fracture surfaces between the uncharged and hydrogen-charged specimen. The fatigue crack initiated from small defects like micro-porosity at inner surface of the weld metal.
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