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The present work concerns the analysis of the phenomena connected to the susceptibility to hydrogen of steels obtained by high grade treatment under thermomechanic control (TMPC), from the point of view of the fatigue life. For this purpose, we have simulated the typical situation of the priming of a fracture at the foot of T-butt joints, caused by external stress, and its propagation through the basic material. We have then developed the work to determine the fatigue life at a low number of cycles (oligocyclic fatigue) in steels with a structure simulating the thermically altered zone (ZTA) of a T-butt joint, taking into account two high grade TMPC steels (450 and 500 MPa of nominal yield strength). This has allowed us to study the phase of priming of the fracture in the absence of defects. The speed of crack propagation has been determined using Paris curves. We have conducted the experiments in three environments which are of interest for applicative purposes, in air; in sea water with -850 mV (Ag/AgCl) cathodic protection; in sea water with -1100 mV (Ag/AgCl) cathodic superprotection.

Additional information

Authors: PONTREMOLI M, Centro sviluppo materiali SpA, Roma (IT);ANDENNA C, Centro sviluppo materiali SpA, Roma (IT)
Bibliographic Reference: EUR 18373 IT (1998) 123pp., ECU 21.50
Availability: Available from the (2)
ISBN: ISBN 92-828-4338-6
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