Microstructure and cyclic deformation behaviour of plain carbon and low-alloyed steels

Uniaxial cyclic deformation behaviour of SA 333 Gr 6 piping steel at room temperature

“…As already pointed out there has been an appearance of an incubation period and in addition a concomitant decrease in the ratcheting as evidenced by a decrease in the strain accumulation at these higher stress rates. The appearance of an incubation period before strain accumulation can be attributed to applied stress amplitude being below the lower yield stress and has also been observed in many other carbon steels [18,22]. The ratcheting rates at the tested R s and _ s have been plotted in terms of total strain accumulated per cycle in Fig.…”

“…Cyclic softening in quenched and tempered structures has been attributed to an increase in the formation of de-pinned dislocations and/or due to reduction of internal stress caused by formation of fatigue substructures [19,20]. In contrast, in annealed ferrite pearlite structures, softening at low total strain amplitudes has been related to the proliferation of dislocation sources (Lüders band formation) [19,21,22]. The results obtained in the present strain controlled tests are in line with the observation of cyclic softening at low strain amplitudes.…”

“PHYBAL” a Short‐Time Procedure for a Reliable Fatigue Life Calculation

“…This kind of cyclic deformation behaviour is well known for ferritic-perlitic microstructures. [15] The load increase tests with HT 0 and HT 3 (HT 2 ) P. Starke et al/''PHYBAL'' a Short-Time Procedure for a Reliable Fatigue . .…”

Wechselverformungsverhalten von betriebsbeanspruchtem 42CrMoS4

“…Die plastische Verformung wird jedoch mit abnehmender Maximalamplitude immer inhomogener [4] und demzufolge gibt die u Èber der Messla Ènge integral gemessene plastische Dehnungsamplitude die lokal ablaufenden Verformungsvorga Ènge nur bedingt wieder. Abb.…”