Nondestructive Evaluation of Fatigue Damage on Steels using Magnetic Techniques

Fatigue Behaviour of Medium Carbon Steel Assessed by the Barkhausen Noise Method

“…For a higher value of strain amplitude (ε = ±0.5%), a decrease in the BNmax parameter, and simultaneously, an increase in the HBNmax parameter were obtained. Moreover, a second peak appeared for negative values of the applied field [30], and the characteristic change in the shape of the Barkhausen noise envelope occurred continuously throughout the fatigue life of the material [30]. This behaviour can be attributed to strain hardening due to growing hindrance of the domain wall movement, and as a consequence, an increase in dislocation density [29].…”

“…Unlike the soft ferrite-pearlitic A48P2 steel, the martensitic 20CDV5 steel exhibited fatigue softening during cyclic loading: an increase in the BNmax parameter with insignificant variations of the HBNmax parameter was observed. Moreover, the second peak does not appear [30].…”

“…The authors found that BNSUM increases as the number of cycles and stress amplitudes increases [30]. For the stress amplitude close to the fatigue limit of SAE8620 steel (Se = 194 ±5 MPa), the BNSUM parameter varies only slightly with the fatigue time [35].…”

“…In the case of steel, the domain walls are of 180º and 90º types [29]. There are some publications that describe some attempts for the Barkhausen noise method application in fatigue process monitoring [30][31][32][33][34]. The authors of [30] examined soft steel A48P2, which contains 0.15% C with a ferrite-pearlite microstructure.…”

“…There are some publications that describe some attempts for the Barkhausen noise method application in fatigue process monitoring [30][31][32][33][34]. The authors of [30] examined soft steel A48P2, which contains 0.15% C with a ferrite-pearlite microstructure. It is regarded as the most encountered in steam generator pipes.…”