Abstract
The effects on the hydrogen embrittlement (HE) due to variation of the delta ferrite contents were investigated on austenitic stainless steel welds. The hydrogen distriburion in the microstructure was studied by means of the hydrogen microprint technique. The damage caused by the hydrogen was evaluated through bending and tensile tests. The ferrite-austenite interfaces act as hydrogen traps. Ferrite increases the susceptibility to hydrogen, the greater the quantity of ferrite, the more HE, which basically modifies the form in which the hydrogen damages the material: it causes the austenite to change from a normal fragile fracture to a ductile fracture, accompanying the ferrite fragile fracture.
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